The anodized layer growth in H 2 SO 4 2 mol L −1 on three different aluminium alloys (1050, 7175, 2618) is investigated by in-situ electrochemical methods and ex-situ characterization techniques.. SEM observations of the anodic films indicate that they contain defects related to the size and the composition of the intermetallic phases …Wholesale Perforated punching hole aluminum material fencing panels. FOB Price. US $30.00 1 - 15 square meter. US $29.00 16 - 100 square meter. US $28.00 101 - 3,000 square meter. US $27.00 3,001 - 5,000 square meter. group name Aluminum Perforated panels Min Order 1 square meter brand name Maynowei modelJan 18, 2022 · In recent years, noise pollution has become one of the most critical human environmental problems. It has adverse effects on people’s health and their work efficiency. Therefore, porous materials have gained enormous attention because they offer excellent sound absorption properties, low density, high specific strength, etc. In this review article, sound absorption in materials with ... Sep 5, 2018 · Three different types of nickel oxide electrochromic films are colored and bleached in 1M KOH solution: porous NiO prepared by anodic oxidation of nickel, NiO(OH) x obtained by reactive evaporation, … Expand 4 min read. “Anodizing is an electrochemical process that converts the metal surface into a decorative, durable, corrosion-resistant, anodic oxide finish.” -Aluminum Anodizers Council. Anodizing is one of the most environmentally friendly processes in the coating industry. Since it is not a metal plating process, it produces no hazardous waste.Anodic oxide films on aluminum are classified into two groups: porous-type anodic oxide films (PAOF) and barrier-type anodic oxide films (BAOF). The present paper is a review of the corrosion of pure aluminum (Al) and Al alloys covered with PAOF and BAOF, focusing on the role of anodic oxide films in the process of corrosion. Several topics are …Jul 1, 2010 · Step 1: Preparation Is Key. Media Platforms Design Team. Your first step should always be to locate the centers of all the holes you will need to make. You can then use a compass or circle ... Jun 13, 2014 · Multipolar Resonances of Ag Nanoparticle Arrays in Anodic Aluminum Oxide Nanochannels for Enhanced Hot Spot Intensity and Signal-to-Background Ratio in Surface-Enhanced Raman Scattering. ACS Applied Nano Materials 2020 , 3 (5) , 4477-4485. the self-lubricating film is 0.18, much lower than that of the anodic aluminum oxide template, which is 0.52. In comparison with the ... The high-purity aluminum plate (thickness of 0.25 mm, purity of 99.999%) was cut into pieces with 28 mm in diameter, and annealed for 3 h in vacuum.Jan 8, 2024 · The specifications of perforated aluminum single panel are divided into thickness, width, and length. There are generally five types of thicknesses: 1.0mm, 1.5mm, 2.0mm, 2.5mm, and 3.0mm. Special ... Jun 13, 2014 · Multipolar Resonances of Ag Nanoparticle Arrays in Anodic Aluminum Oxide Nanochannels for Enhanced Hot Spot Intensity and Signal-to-Background Ratio in Surface-Enhanced Raman Scattering. ACS Applied Nano Materials 2020 , 3 (5) , 4477-4485. One dimensional metal nanostructures have attracted great attention in fundamental research and technical applications in nanoelectrics devices, 1–3 magnetic …Nanomesh graphene using an anodic aluminum oxide (AAO) template and block copolymer lithography exhibit band gap opening, which overcomes the material’s limitation of zero bandgap in graphene 13,14.Nov 9, 2009 · It is one of the few metals that retain its full silvery reflectance in finely powdered form, making it an important component for mirror coatings. Aluminum mirror finish has the highest reflectance of any metal in the 200–400 nm ultraviolet and the 3000–10000 nm infrared spectral ranges. However, its reflectance in the 400–700 nm visible ... For the formation of anodic alumina nanofibers, 4N aluminum plates were anodized in a concentrated pyrophosphoric acid solution at 25–75 V. The morphology of the anodic oxide successively changed to barrier oxide, porous oxide, nanofibers, bundle structures with many nanofibers, and then weak nanofibers during anodizing. Microstructure and Volta-potential analyses were conducted to characterise intermetallic-particles (IMPs) in AA7075-T5. EIS and AFM were applied under operando-conditions to investigate anodisation processes. IMPs have pronounced influence on the growth of anodic aluminium oxide (AAO) films resulting in low charge-transfer …AC-etched aluminum foils for an Al electrolytic capacitor were covered with a TiO2 film by a sol–gel coating and then anodized to 25 V in an ammonium adipate solution. The structure, properties, and performance of the anodic oxide films were examined by transmission electron microscopy (TEM), scanning electron microscopy …Considering the increasing interest for Al alloys in the packaging industry, where component lightweighting allows higher process efficiency, as well as the increasing use of additively manufactured parts, which may not show a satisfactory tribological behaviour in the as-built condition, anodising by Electrochemical Oxidation (ECO) and …Complimenting our September 2019 International Patent Calendar (which focused mostly on methods of anodizing aluminum), this month’s collection of patents focuses on special applications of anodized aluminum surfaces. The uniqueness of anodized aluminum oxide coatings in terms of their chemical, physical, and mechanical …To increase the density of the micro-arc oxide coating, AA 1060 samples were pretreated with an anodic oxide film in an oxalic acid solution. Plasma electrolytic oxidation (PEO) was performed to investigate the effect of the thickness of the pre-anodic oxide film on the soft-sparking mechanism. The experimental results revealed that the …The anodising process parameters (voltage, temperature, and electrolyte) control the morphology and the chemical composition of the resulting anodic oxide film by altering the balance between oxide growth and oxide dissolution reactions. The porosity of the oxide film is reduced by the addition of tartaric acid to a sulfuric acid electrolyte, …2. Experimental. High-purity aluminium was deposited by magnetron sputtering, using a 99.99% aluminium target, onto electropolished 99.99% aluminium substrates, of size about 4×1.5 cm, that had been anodized to 150 V at 5 mA cm −2 in 0.1 M ammonium pentaborate electrolyte at 293 K. The substrates provide flat surfaces, while …The anodic oxide coating of aluminum, which is also known as Alumite, is one of our strongest technologies. Aluminum is an active metal that naturally forms a thin film of aluminum oxide on its surface as it reacts with oxide in the atmosphere. Since this aluminum oxide, once formed, does not change, it protects the internal aluminum. Jul 1, 2001 · They are obtained by different techniques. Two-step electrolytic coloring of anodized aluminum, becoming increasingly important owing to the light fast colors produced by this technique [7]. In this process, the metal particles are deposited in the pores of the anodic oxide coating in the half cycle of the alternating current. Anodic oxidation of metals leads to the formation of ordered nanoporous or nanotubular oxide layers that contribute to numerous existing and emerging applications. However, there are still numerous fundamental aspects of anodizing that have to be well understood and require deeper understanding. Anodization of metals is accompanied by …Dec 15, 2022 · Solution-processed, NiO thin films have been synthesized via spin coating technique. Nickel nitrate hexahydrate and 2-Aminoethanol have been used as nickel precursor and oxidizing agent, respectively for depositing layers of NiO solution on the FTO substrate. Investigating the effect of NiO layers on morphological, structural, electrochromic properties has been observed. An X-Ray diffraction ... The process of anodization was performed in 16% wt. sulfuric acid water solution with a lead cathode. The investigated samples were prepared using the procedure described above at a fixed process time of 20 min and different current densities in the range of 5–20 mA cm −2.. After anodization, the porous oxide surfaces were sealed in water at …Anodizing. These carabiners have an anodized aluminium surface that has been dyed; they are made in many colours. Anodizing is an electrolytic passivation process used to increase the thickness of the natural oxide layer on the surface of metal parts. The process is called anodizing because the part to be treated forms the anode electrode of an ... Anodic aluminum oxide (AAO) layers with nano-sized pores have been used as shadow masks for the fabrication of two-dimensional (2D) metal nanodot arrays (NDAs). However, the localized surface plasmon resonance (LSPR) of size-controlled NDAs fabricated using AAO masks has not been much studied.Apr 13, 2023 · The sound-absorbing ATS Acoustic panel offers a Noise Reduction Coefficient (NRC) rating of 1.0, which describes how a product absorbs sounds. On a scale of 0 to 1.0, a product with a rating of 1. ... Sep 8, 2021 · The influences of different pre-treatment approaches, comprising sandblasting, grinding, chemical polishing, and plowing, and various anodizing parameters, including electrolyte composition, temperature, current density, time, and final voltage, on the quality of anodized aluminum oxide (AAO) film on AA 6061 were studied in the present research. It was found that, during both mild and hard ... Porous anodic aluminum oxide (AAO) films can be conveniently produced by anodization of aluminum. Porous oxide layer formed on aluminum contains a large number of mutually parallel pores. Each cylindrical nanopore and its surrounding oxide constitute a hexagonal cell aligned normal to the metal surface. Under proper conditions, …Anodic alumina oxide (AAO): a layer formed by anodization in an acid electrolyte at temperatures (0 - 35˚C) and various anodizing potentials (30 – 65 V) (Zaraska, 2014) Chemical etching: in this study, this is accomplished using both alkaline (e.g., sodium hydroxide) and acid solutions. All machining oils, greases, and other surfaceOct 1, 2023 · Iqbal et al. [166] prepared porous anodic aluminum by anodic oxidation and inserted PFDTS group into LDH, and successfully prepared S-CeMgAl-LDH multi-level structure through cerium modification. The research showed that the LDHs had a strong ultraviolet shielding effect due to the special layered structure and the absorption of particles in ... Anodizing again might look complex, however, the steps are straightforward. Below are the general steps used in the anodizing process. Step 1: First, cleaning of the aluminum part occurs before undergoing anodization. This is important for the removal of impurities that can hinder the process.It is well known that corrosion protection of pure Al is enormously improved by the formation of porous anodic oxide films and by pore sealing treatment. However, the effects of anodizing and pore sealing on corrosion protection for Al alloys are unclear, because the alloying elements included in Al alloys affect the structure of anodic oxide …Oct 20, 2021 · Analysis Of Common Problems In Anodizing. The anodic oxidation of aluminum uses aluminum or aluminum alloy as anode and lead plate as cathode to electrolyze in aqueous solution such as sulfuric acid, oxalic acid, chromic acid, etc., to form an oxide film on the surface. Among them, sulfuric acid anodizing is the most widely used. Anodic aluminum oxide single plate, You Can Buy Various High Quality Anodic aluminum oxide single plate Products from Global Anodic aluminum oxide single plate Suppliers and Anodic aluminum oxide single plate Manufacturers at Tradevv.com Etched aluminum foil for aluminum electrolytic capacitor was first boiled in water for different time to form hydrous film on Al foil and then anodized in H3BO4 solution at 530 V to form anodic oxide barrier film as insulating dielectric layer. The obtained films were characterized by field-emission scanning electron microscopy, transmission …#2 Aluminum oxide’s three-dimensional crystalline structure refracts and reflects the natural light distinctively. Light strikes anodized aluminum and interacts differently with colored and uncolored metal parts. As a result of their interactions with different surfaces, the light that reaches your eye has varying wavelengths.Nov 23, 2022 · By Team Xometry. November 23, 2022. 7 min read. Black anodizing refers to the process of anodizing an aluminum part and then dying it black using a suitable dye. This must not be confused with black oxide coating which is unsuitable for aluminum parts. Anodized aluminum has improved wear and corrosion properties, while black anodized parts have ... Change in the steady-state current density with the voltage, where anodizing was performed at constant voltage in 1-mol dm −3 sulfuric acid, 0.3-mol dm −3 oxalic acid, 0.3-mol dm −3 chromic ...The leakage current through the anodic aluminum oxide films is a key performance criterion for the capacitors. A lower leakage current means the excellent …the self-lubricating film is 0.18, much lower than that of the anodic aluminum oxide template, which is 0.52. In comparison with the ... The high-purity aluminum plate (thickness of 0.25 mm, purity of 99.999%) was cut into pieces with 28 mm in diameter, and annealed for 3 h in vacuum.Two types of anodic aluminum oxide can be formed, depending on the nature of the used anodizing electrolyte. A non-porous oxide is formed in neutral electrolytes [ 53 ]. Conversely, the porous anodic aluminum oxide is formed in acidic electrolytes, such as selenic, sulfuric, oxalic, phosphoric, chromic, malonic, tartaric, citric, …The primary objective of this research was to employ the response surface methodology to optimize the thickness and microhardness of anodic aluminum oxide formed on 6061-T6 Aluminum Alloy. Additionally, a comparative analysis of the corrosion resistance and microhardness of the anodized coating was conducted, utilizing both …Anodic aluminum oxide (AAO) with matrix arrays of pores was obtained using nanoimprint and anodizing. Si 3 N 4 imprint stamps were fabricated using electron-beam lithography. The Si 3 N 4 stamps were imprinted into Al films grown on Si wafers by applying a force of 250 kg for 10 s. Two different diameters (45 and 80 nm) and two …Abstract. This work evaluates the dry sliding behavior of anodic aluminum oxides (AAO) formed during one traditional hard anodizing treatment (HA) and two golden hard anodizing treatments (named G and GP, respectively) on a EN AW-6060 aluminum alloy. Three different thicknesses of AAO layers were selected: 25, 50, and 100 μm.The fabrication of porous AAO membranes with nanostructures mainly follows a two-step electrochemical anodization process [] after proper pretreatments [23, 24].The aluminum foils are initially covered by natural oxide layers and surface roughness caused by thermal and mechanical processes [].To minimize the impact of these defects …Guo Y., Zhang L., Han M., Wang X., Xie J. and Deng L. 2018 The effect of ethylene glycol on pore arrangement of anodic aluminium oxide prepared by hard anodization R. Soc. Open Sci. 5 171412. Crossref Google Scholar [24.] Ono S., Saito M., Ishiguro M. and Asoh H. 2004 Controlling factor of self-ordering of anodic porous alumina JPorous anodic aluminum oxide film was obtained by anodic oxidation. Fig. 1 a shows the schematic diagram of the anodic oxidation equipment. The detail anodic oxidation process was as follows: a 60 mm graphite disk with a thickness of 3 mm was used as cathode electrode, and aluminum disk was acted as anode electrode.The distance …Anodic film growth on a Ti alloy in water-containing ethylene glycol electrolyte with addition of fluoride (0.016–0.17 mol dm−3) was investigated using electrochemical and surface analytical techniques. Steady-state current–potential curves and electrochemical impedance spectra as depending on potential and fluoride content …#2 Aluminum oxide’s three-dimensional crystalline structure refracts and reflects the natural light distinctively. Light strikes anodized aluminum and interacts differently with colored and uncolored metal parts. As a result of their interactions with different surfaces, the light that reaches your eye has varying wavelengths.The anodized aluminum specimen as the anode and a platinum plate as the cathode were immersed in a 1.0 M NaCl/EG solution at 293 K, then linear sweep voltammetry (1 V s −1) and constant voltage electrolysis (10 V higher than the anodizing voltage) were carried out to separate the AAO film from the aluminum surface using a …7.2.1 Types of AAO. With the progressive development of both anodic oxide layer growth on Al surface from a variety of electrolytes and with the advent of the electron microscopy, Keller and his co-workers in the year 1953 [] first reported the formation of self-organized hexagonal nanoporous and barrier types of alumina layer attached to Al …1. The anodic oxide aluminum films with electrodeposited Ag have an antibacterial activity over 95% against the growth of E. coli, P. aeruginosa, S. faecalis and S. aureus. 2. By using AC electrodeposition, the Ag nanowires can be prepared in pores of the anodized aluminum film, and the diameters of the nanowires are 10 or 25 nm.Anodizing is one of the most common surface treatments of aluminum, and is performed for corrosion protection as well as for a wide variety of other purposes. 1–3 …Jan 8, 2024 · The specifications of perforated aluminum single panel are divided into thickness, width, and length. There are generally five types of thicknesses: 1.0mm, 1.5mm, 2.0mm, 2.5mm, and 3.0mm. Special ... Wholesale Perforated punching hole aluminum material fencing panels. FOB Price. US $30.00 1 - 15 square meter. US $29.00 16 - 100 square meter. US $28.00 101 - 3,000 square meter. US $27.00 3,001 - 5,000 square meter. group name Aluminum Perforated panels Min Order 1 square meter brand name Maynowei modelanodic aluminium oxide is insoluble, are used. Then, under a certain applied voltage, an insulator oxide barrier layer is formed. In brief, the process involves the migration of oxygen-containing ions (O2 −and OH ) into the metal from the metal-oxide interface, while the metal ions can either form an oxide layer or be released to the electrolyte.To improve the LOD the pre-concentration time is typically extended or the rate of deposition increased; the latter achieved by increasing the mass transfer rate at which species can reach the surface. 21,31 Pre-concentration is followed by anodic oxidation (or dissolution), of the metal back to metal ions (eqn (2); Fig. 1); the stripping step.Hence electrode …Enhanced wear and corrosion resistance properties are vital for numerous functional and decorative applications. Anodizing is a process frequently used to generate stable oxide coatings on metal surfaces, including aluminium (Al). We present an evaluation of process variables for optimized anodized coating properties using existing …2. Experimental. High-purity aluminium was deposited by magnetron sputtering, using a 99.99% aluminium target, onto electropolished 99.99% aluminium substrates, of size about 4×1.5 cm, that had been anodized to 150 V at 5 mA cm −2 in 0.1 M ammonium pentaborate electrolyte at 293 K. The substrates provide flat surfaces, while …Complimenting our September 2019 International Patent Calendar (which focused mostly on methods of anodizing aluminum), this month’s collection of patents focuses on special applications of anodized aluminum surfaces. The uniqueness of anodized aluminum oxide coatings in terms of their chemical, physical, and mechanical …In particular, aluminum is often anodized for mechanical property improvement, 1–4 corrosion protection, 5–9 electronic applications, 10,11 and nanostructural engineering. 12–14 The morphology of anodic aluminum oxide is determined by the electrolyte solution used during anodizing. 15–20 Anodizing aluminum in a pyrophosphoric acid (H 4 ... Anodizing again might look complex, however, the steps are straightforward. Below are the general steps used in the anodizing process. Step 1: First, cleaning of the aluminum part occurs before undergoing anodization. This is important for the removal of impurities that can hinder the process.The chemical dissolution—in 0.1 M solutions of phosphoric, malonic, citric, sulfosalicylic, and tartaric acids and 0.6 M solutions of sulfuric, oxalic, malonic, …Anodic oxidation of metals leads to the formation of ordered nanoporous or nanotubular oxide layers that contribute to numerous existing and emerging applications. However, there are still numerous fundamental aspects of anodizing that have to be well understood and require deeper understanding. Anodization of metals is accompanied by …To improve the LOD the pre-concentration time is typically extended or the rate of deposition increased; the latter achieved by increasing the mass transfer rate at which species can reach the surface. 21,31 Pre-concentration is followed by anodic oxidation (or dissolution), of the metal back to metal ions (eqn (2); Fig. 1); the stripping step.Hence electrode …Anodic aluminum oxide (AAO) templates have been intensively investigated during the past decades and have meanwhile been widely applied through …Guo Y., Zhang L., Han M., Wang X., Xie J. and Deng L. 2018 The effect of ethylene glycol on pore arrangement of anodic aluminium oxide prepared by hard anodization R. Soc. Open Sci. 5 171412. Crossref Google Scholar [24.] Ono S., Saito M., Ishiguro M. and Asoh H. 2004 Controlling factor of self-ordering of anodic porous alumina JThe anodic oxide film showed good insulating properties as a resist mask during electrochemical etching in the solution. A hemicylindrical microgroove with thin free-standing anodic oxide on the groove was fabricated by electrochemical etching, and the groove showed a smooth surface with a calculated mean roughness of 0.2–0.3 μm.Porous anodic aluminum oxide (AAO) films can be conveniently produced by anodization of aluminum. Porous oxide layer formed on aluminum contains a large number of mutually parallel pores. Each cylindrical nanopore and its surrounding oxide constitute a hexagonal cell aligned normal to the metal surface. Under proper conditions, …We are professional china Anodic oxide sound-absorbing punching hole carved aluminum plate in scenic spot Manufacturer, Anodic oxide sound-absorbing punching hole carved aluminum plate in scenic spot Supplier，More types of Carved aluminum plate in scenic spot you wanted,please contact us right now! Mar 1, 2019 · It is usually white, but is sometimes pink (88% alumina) and brown (96% alumina). The composition of aluminum oxide can be easily changed to enhance certain desirable material characteristics such as the hardness or color. Aluminum oxide is an electrically insulating material with high resistivity that increases with purity. The PosiTector 6000 "N" series of eddy current gages are ideal for non-destructive measurement of nonconductive coatings on non-ferrous substrates. The PosiTector 6000 NAS probe is specifically designed for high resolution measurement of anodizing on aluminum. Though capable of measuring up to 625 μm (25 mils), the PosiTector 6000 NAS probe is ... In this review, the research conducted by the authors on anodic oxide films on aluminum is described, paying particular attention to how the electric field strength, …aluminum alloys because anodic aluminum films are porous. The purpose of this paper is to enhance hardness, abrasion resistance and corrosion resistance of the surface of 2024 aluminum alloy via the anodic oxidation and sealing procedure. The aluminum alloy is polarized under periodic anodization voltage in the sulfuric acid solution.Anodic aluminum oxide (AAO) template, which is prepared by electrochemical anodization of aluminum in an acidic electrolyte, is one of the typical self-organized fine structures …Apr 13, 2023 · The sound-absorbing ATS Acoustic panel offers a Noise Reduction Coefficient (NRC) rating of 1.0, which describes how a product absorbs sounds. On a scale of 0 to 1.0, a product with a rating of 1. ... 1. When the aluminum material enters the electrophoresis tank, bubbles or air on the surface of the paint solution are drawn in;2. There is air entrainment in the circulating system;3. The cathode shielding is …Nov 9, 2009 · It is one of the few metals that retain its full silvery reflectance in finely powdered form, making it an important component for mirror coatings. Aluminum mirror finish has the highest reflectance of any metal in the 200–400 nm ultraviolet and the 3000–10000 nm infrared spectral ranges. However, its reflectance in the 400–700 nm visible ... Aluminum alloys used for aerospace applications provide good strength to weight ratio at a reasonable cost but exhibit only limited corrosion resistance. Therefore, a durable and effective ...The leakage current through the anodic aluminum oxide films is a key performance criterion for the capacitors. A lower leakage current means the excellent …The chemical dissolution—in 0.1 M solutions of phosphoric, malonic, citric, sulfosalicylic, and tartaric acids and 0.6 M solutions of sulfuric, oxalic, malonic, …Then the aluminum sheets were electro-polished under a constant-current condition of 0.5 A/cm 2 in a mixture of HClO 4 and C 2 H 5 OH with volume ratio 1:4 for 5 min before anodizing, the treated high-purity aluminum sheets were fixed on the anode with a clamp, and at the same time, they were kept parallel to the large aluminum plate …The anodized layer growth in H 2 SO 4 2 mol L −1 on three different aluminium alloys (1050, 7175, 2618) is investigated by in-situ electrochemical methods and ex-situ characterization techniques.. SEM observations of the anodic films indicate that they contain defects related to the size and the composition of the intermetallic phases …Then the aluminum sheets were electro-polished under a constant-current condition of 0.5 A/cm 2 in a mixture of HClO 4 and C 2 H 5 OH with volume ratio 1:4 for 5 min before anodizing, the treated high-purity aluminum sheets were fixed on the anode with a clamp, and at the same time, they were kept parallel to the large aluminum plate …Change in the steady-state current density with the voltage, where anodizing was performed at constant voltage in 1-mol dm −3 sulfuric acid, 0.3-mol dm −3 oxalic acid, 0.3-mol dm −3 chromic ...Jan 8, 2024 · The specifications of perforated aluminum single panel are divided into thickness, width, and length. There are generally five types of thicknesses: 1.0mm, 1.5mm, 2.0mm, 2.5mm, and 3.0mm. Special ... Aofu Wiremesh Herringbone Hole Punching Mesh Suppliers 20m Length Galvanized Perforated Sheet China 0.8-100mm Aperture Aluminum Alloy Punching Mesh FOB Price: US $5-8 / Square Meter The effect of pH value and different kinds of anions on the corrosion behavior of Cu/Al casting-rolled clad plates in the alkaline solution was evaluated by means of scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), weight loss analysis, 3D confocal laser scanning microscopy (CLSM) …Figure 2: AFM images of anodized aluminum oxide finishes after careful removal from the aluminum substrate. (Left) surface of the aluminum substrate surface. Each dark spot is the nucleation point of the oxide during surface reconstruction. The lighter areas surrounding each nucleation point are the areas where the column walls intersected theAnodic oxide films were prepared by anodic oxidation on the surface of ADC12 aluminum alloy and their corrosion properties were explored. The original samples, anodized samples, and sealed samples ...The aim of present study is to design a simple and reliable capacitive humidity sensor based on the nanoporous alumina prepared by a two-step anodization technique. Owing to long-range-ordered structure of porous alumina, its electrical properties are sensitive to moisture; with the result, it finds potential applications as humidity sensor. …Guo Y., Zhang L., Han M., Wang X., Xie J. and Deng L. 2018 The effect of ethylene glycol on pore arrangement of anodic aluminium oxide prepared by hard anodization R. Soc. Open Sci. 5 171412. Crossref Google Scholar [24.] Ono S., Saito M., Ishiguro M. and Asoh H. 2004 Controlling factor of self-ordering of anodic porous alumina JThe aluminum oxide (Al 2 O 3) coating was achieved by performing anodizing techniques with a direct current (DC) power supply (TNI-UTM, Saharoonggroj Co., Ltd., Thailand). The electrolyte solution was diluted sulphuric acid at a concentration of 20 wt%, meanwhile 30 mm × 60 mm stainless steel plate was employed as the cathode..