Influence of Grain Orientation on the Corrosion Behavior of Rolled AZ31 Magnesium Alloy

• Published in: Acta metallurgica sinica : English letters Vol. 28; no. 11; pp. 1387 - 1393
• Main Authors: Zhao, Yan-Chun, Huang, Guang-Sheng, Wang, Guan-Gang, Han, Ting-Zhuang, Pan, Fu-Sheng
• Format: Journal Article
• Language: English
• Published: Beijing The Chinese Society for Metals 01.11.2015; Springer Nature B.V
• Subjects: AZ31镁合金; Characterization and Evaluation of Materials; Chemistry and Materials Science; Corrosion; Corrosion and Coatings; Corrosion effects; Corrosion resistance; Electrochemical impedance spectroscopy; Electrodes; Grain orientation; Grains; Hydrogen; Immersion tests (corrosion); Investigations; Magnesium alloys; Magnesium base alloys; Materials Science; Materials substitution; Metal sheets; Metallic Materials; Microscopy; Nanotechnology; Organometallic Chemistry; Orientation effects; Planes; Rolling direction; Spectroscopy/Spectrometry; Spectrum analysis; Surface roughness; Topography; Tribology; 扫描电镜观察; 晶粒取向; 浸泡试验; 电化学阻抗谱; 腐蚀行为; 表面形貌; 表面粗糙度; Crystallographic orientation; Corrosion behavior; Magnesium alloys; Electrochemical impedance spectroscopy
• ISSN: 1006-7191; 2194-1289
• DOI: 10.1007/s40195-015-0337-2

The effect of the grain orientation on corrosion behavior of rolled AZ31 magnesium alloy is investigated in this study. The test samples have a similar surface roughness to the Mg alloy in practical application. The immersion test and electrochemical impedance spectroscopy show that the TD-ND planes dominated by （101-0）, （1120） and （1011） oriented grains show a higher corrosion resistance compared with these of the RD-TD planes which consist mainly of （0001） oriented grains. Here, RD, ND and TD represent the rolling direction, the normal direction and the transverse direction of the alloy sheet, respectively. The surface morphologies of the alloys at various immersion stages are observed by scanning electron microscopy, and the surface topography of the alloy substitutes is also observed by laser scanning confocal microscopy. The TD-ND planes show a regular corrosion along the TD direction, but the RD-TD plane shows an irregular corrosion.