Effect of Anodizing Voltage on the Morphology and Growth Kinetics of Porous Anodic Alumina on Al-0.5 wt% Mn Alloys

2013 ◽  
Vol 832 ◽  
pp. 101-106 ◽  
Author(s):  
C.H. Voon ◽  
M.N. Derman ◽  
U. Hashim ◽  
K.L. Foo ◽  
Tijjani Adam
Keyword(s):  
Growth Kinetics ◽  
Pore Diameter ◽  
Dielectric Breakdown ◽  
Anodic Alumina ◽  
Porous Anodic Alumina ◽  
Manganese Alloy ◽  
Interpore Distance ◽  
Dimensional Parameters ◽  
Pore Arrangement ◽  
Kinetics Of

In this study, the effect of anodizing voltage on the morphology of porous anodic alumina and growth kinetics of anodizing of aluminium manganese alloy was reported. It was found that the increasing anodizing voltage affect the morphology and dimensional parameters of porous AAO. Both pore diameter and interpore distance increased as a function of anodizing voltage. The regularity of porous AAO was affected by anodizing voltage. Dielectric breakdown occurred at anodizing voltage of 70 V and led to protrusions and cracks of the porous anodic alumina. Moderate anodizing voltage promoted the formation of well ordered pore arrangement while disordered pore arrangement was observed when the anodizing voltage was too low or too high. The thickness of porous AAO increased as the anodizing voltage increased.

Effect of Anodizing Voltage on the Formation of Porous Anodic Alumina on Al-0.5wt% Mn Alloys

2014 ◽  
Vol 925 ◽  
pp. 455-459 ◽  
Author(s):  
Chun Hong Voon ◽  
M.N. Derman ◽  
U. Hashim ◽  
K.L. Foo
Keyword(s):  
Pore Diameter ◽  
Anodic Alumina ◽  
Porous Anodic Alumina ◽  
Manganese Alloy ◽  
Interpore Distance ◽  
Ordered Porous

In this study, the effect of anodizing voltage on the morphologies, pore diameter and interpore distance on the porous anodic alumina formed on aluminium manganese alloy was reported. It was found that the anodizing influenced the morphologies and regularities of porous anodic alumina formed on aluminum-manganese substrate. Well ordered porous anodic alumina was obtained when anodizing voltage were 40 V and 50 V respectively. Disordered porous anodic alumina was formed when anodizing of 30 V and 70 V were applied during the anodizing process. Both pore diameter and interpore distance of porous anodic alumina increased linearly with the anodizing voltage.

scholarly journals Effect of Manganese Content on the Fabrication of Porous Anodic Alumina

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
C. H. Voon ◽  
M. N. Derman ◽  
U. Hashim
Keyword(s):  
Pore Diameter ◽  
Chromic Acid ◽  
Cell Structure ◽  
Manganese Content ◽  
Single Step ◽  
Anodic Alumina ◽  
Porous Anodic Alumina ◽  
Secondary Phases ◽  
Interpore Distance ◽  
Ordered Porous

The influence of manganese content on the formation of well-ordered porous anodic alumina was studied. Porous anodic alumina has been produced on aluminium substrate of different manganese content by single-step anodizing at 50 V in 0.3 M oxalic acid at 15°C for 60 minutes. The well-ordered pore and cell structure was revealed by subjecting the porous anodic alumina to oxide dissolution treatment in a mixture of chromic acid and phosphoric acid. It was found that the manganese content above 1 wt% impaired the regularity of the cell and pore structure significantly, which can be attributed to the presence of secondary phases in the starting material with manganese content above 1 wt%. The pore diameter and interpore distance decreased with the addition of manganese into the substrates. The time variation of current density and the thickness of porous anodic alumina also decreased as a function of the manganese content in the substrates.

Effects of Anodization Time and Temperature on the Pore Arrangement of Porous Anodic Alumina Anodized in Sulfuric Acid

2013 ◽  
Vol 63 (11) ◽  
pp. 1249-1253
Author(s):  
Jin Ho KWAK ◽  
Jin Kyu HAN ◽  
Yong Chan CHOI ◽  
Sang Don BU*
Keyword(s):  
Sulfuric Acid ◽  
Anodic Alumina ◽  
Porous Anodic Alumina ◽  
Anodization Time ◽  
Pore Arrangement

Formation of Porous Anodic Alumina from Impure Aluminum Foil in Inorganic Acids

2015 ◽  
Vol 1112 ◽  
pp. 89-93
Author(s):  
Ahmad Nurrudin ◽  
Brian Yuliarto ◽  
Suyatman ◽  
Agung Sriwongo
Keyword(s):  
Room Temperature ◽  
Porous Alumina ◽  
Aluminum Foil ◽  
Average Diameter ◽  
Anodic Alumina ◽  
Porous Anodic Alumina ◽  
Sulfate Electrolyte ◽  
Average Pore ◽  
Interpore Distance ◽  
Inorganic Acids

The morphology of porous anodic alumina (PAA) formed by anodizing in inorganic electrolytes is reported. An impure aluminum was anodized in sulfuric acid, phosphoric acid and chromic acidat room temperature with a constant applied potential 2 – 30 V. The formation of porous anodic alumina was carried out by one and two steps anodization. It is clearly noted that anodizing impure aluminum at room temperature provide higher kinetic of oxide dissolution compared to oxide growth. Two steps anodizing aluminum in sulfate electrolyte always resulted in random porous alumina, while phosphate electrolyte provided strong anodization producing irregular porous alumina with average diameter of 61.6 nm. Two steps anodizing aluminum in chromate electrolyte produce better pore ordering with relatively large size pore distributions. The average pore diameter of alumina increases linearly with applied voltage, with proportionality factor lp 0.83 nmV-1. Annealing the sample increased the interpore distance, removed stresses providing lower activation energy for pore formation.

scholarly journals A Novel Method for Fabricating Double Layers Porous Anodic Alumina in Phosphoric/Oxalic Acid Solution and Oxalic Acid Solution

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Yanfang Xu ◽  
Xiaojiu Li ◽  
Hao Liu ◽  
Jie Xu
Keyword(s):  
Oxalic Acid ◽  
Acid Solution ◽  
Oxalic Acid Solution ◽  
Anodic Alumina ◽  
Porous Anodic Alumina ◽  
Double Layers ◽  
Pore Density ◽  
Interpore Distance ◽  
Small Pore ◽  
Novel Method

A novel method for fabricating ordered double layers porous anodic alumina (DL-PAA) with controllable nanopore size was presented. Highly ordered large pore layer with interpore distance of 480 nm was fabricated in phosphoric acid solution with oxalic acid addition at the potential of 195 V and the small pore layer was fabricated in oxalic acid solution at the potential from 60 to 100 V. Experimental results show that the thickness of large pore layer is linearly correlative with anodizing time, and pore diameter is linearly correlative with pore widening time. When the anodizing potential in oxalic acid solution was adjusted from 60 to 100 V, the small pore layers with continuously tunable interpore distance from 142 to 241 nm and pore density from1.94×109to4.89×109 cm−2were obtained. And the interpore distance and the pore density of small pore layers are closely correlative with the anodizing potential. The fabricated DL-PAA templates can be widely utilized for fabrication of ordered nanomaterials, such as superhydrophobic or gecko-inspired adhesive materials and metal or semiconductor nanowires.

Brilliant and tunable color by changing pore diameter of metal-coated porous anodic alumina

2012 ◽  
Author(s):  
Jiawen Li ◽  
Zhiqiang Zhu ◽  
Ping Deng ◽  
Yanlei Hu ◽  
Jiaru Chu ◽  
...  
Keyword(s):  
Pore Diameter ◽  
Anodic Alumina ◽  
Porous Anodic Alumina

Oxide Dissolution Treatment of Porous Anodic Alumina

2015 ◽  
Vol 1109 ◽  
pp. 73-77
Author(s):  
Chun Hong Voon ◽  
Mohd Nazree Derman ◽  
U. Hashim ◽  
Bee Ying Lim ◽  
Sung Ting Sam
Keyword(s):  
Periodic Structures ◽  
Cell Structure ◽  
Anodic Alumina ◽  
Porous Anodic Alumina ◽  
Hexagonal Cell ◽  
Oxide Dissolution ◽  
Purity Aluminium ◽  
High Purity Aluminium ◽  
Pore Arrangement ◽  
Ordered Porous

In this study, oxide dissolution treatment was used for the formation of well ordered porous anodic alumina. Porous anodic alumina was formed on mechanically polished high purity aluminium by anodizing at 50 V in 0.3 M oxalic acid of 15°C for 60 minutes. It is observed that the pore arrangement of as anodized porous anodic alumina was randomly distributed and showed no ordered hexagonal cell structure. As anodized porous anodic alumina were then subjected to oxide dissolution treatment of increasing exposure duration, up to three minutes. Micrographs were captured by using scanning electron microscope. Pore arrangement of porous anodic alumina subjected to oxide dissolution treatment up to two minutes were similar to one another where no ordered periodic structures were formed. .When porous anodic alumina subjected to oxide dissolution treatment for three minutes, a perfect hexagonal pore arrangement was obtained.

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