Effects of Sampling Position in 7050 Aluminum Alloy Extra-thick Plate on Corrosion Resistance of Anodic Alumina Film

Li Hongwei; Chen Gaohong

doi:10.15980/j.tzzz.2022.05.017

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Effects of Sampling Position in 7050 Aluminum Alloy Extra-thick Plate on Corrosion Resistance of Anodic Alumina Film
Vol. 42, Issue 5, Pages: 605-609(2022)
Published： 2022 ，
DOI： 10.15980/j.tzzz.2022.05.017

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Li Hongwei, Chen Gaohong. Effects of Sampling Position in 7050 Aluminum Alloy Extra-thick Plate on Corrosion Resistance of Anodic Alumina Film. [J]. Special Casting & Nonferrous Alloys 42(5):605-609(2022)
DOI：

Li Hongwei, Chen Gaohong. Effects of Sampling Position in 7050 Aluminum Alloy Extra-thick Plate on Corrosion Resistance of Anodic Alumina Film. [J]. Special Casting & Nonferrous Alloys 42(5):605-609(2022) DOI： 10.15980/j.tzzz.2022.05.017.

摘要

以200 mm厚7050-T7451铝合金超厚板作为研究对象，在合金不同厚度、不同取向取样，研究不同取样位置处铝合金的显微组织特征，而后进行硫酸阳极氧化处理，并研究取样位置对氧化膜耐蚀性的影响。采用动电位极化、电化学阻抗谱(EIS)来评估其耐蚀性能。结果发现，从表层到中心层，铝合金试样组织结构有所不同；经过阳极氧化处理后，在表层L-T面试样腐蚀电流密度最低，阻抗最高，具有最好的耐蚀性能。

Abstract

7050-T7451 aluminum alloy super-thick plate with thickness of 200 mm was taken as the research object

and samples were cut from different thickness and different orientation to investigate the microstructure characteristics of aluminum alloy at different sampling positions. Then the samples were anodized in sulfuric acid

and the influence of sampling position on corrosion resistance of anodic alumina film was also analyzed. The corrosion resistance was evaluated by potentiodynamic polarization and electrochemical impedance spectroscopy（EIS）. The results reveal that the microstructure of the aluminum alloy samples is different to some extent from the surface to the center. After anodizing

the corrosion current density of L-T surface is the lowest

while the impedance is the highest

indicating the desirable corrosion resistance.