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51315-5699-Effect of Anodizing Treatment on Galvanically Accelerated Crevice Corrosion of Aluminum Alloy

Picture for Effect of Anodizing Treatment on Galvanically Accelerated Crevice Corrosion of Aluminum Alloy
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Product Number: 51315-5699-SG
ISBN: 5699 2015 CP
Author: Jin Ho Kim
Publication Date: 2015
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Aluminum alloys are widely used in engineering structures and components where corrosion resistance is required because it has protective layers of aluminum oixde. However galvanic corrosion can occur when aluminum alloy is placed in electrical contact with other metals that have more postive corrosion potentials than aluminum. Furthermore corrosion rate can be accelerated in crevice.Anodizing is an electrolytic passivation process used to increase the thickness of oxide layer on the surface. The object to be treated is immersed as the anode in an acid electrolyte and a direct current is applied. Oxidation of the surface occurs to produce a greatly thickened hard porous film of aluminum oxide. Thus aluminum alloys with anodizing treatment have the high corrosion resistance.In this study we investigated ther effect of the oxide layer thickness by anodizing on corrosion behavior especially galvanic current and crevice corrosion behavior of aluminum alloy using various electrochemical techniques.
Aluminum alloys are widely used in engineering structures and components where corrosion resistance is required because it has protective layers of aluminum oixde. However galvanic corrosion can occur when aluminum alloy is placed in electrical contact with other metals that have more postive corrosion potentials than aluminum. Furthermore corrosion rate can be accelerated in crevice.Anodizing is an electrolytic passivation process used to increase the thickness of oxide layer on the surface. The object to be treated is immersed as the anode in an acid electrolyte and a direct current is applied. Oxidation of the surface occurs to produce a greatly thickened hard porous film of aluminum oxide. Thus aluminum alloys with anodizing treatment have the high corrosion resistance.In this study we investigated ther effect of the oxide layer thickness by anodizing on corrosion behavior especially galvanic current and crevice corrosion behavior of aluminum alloy using various electrochemical techniques.
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