De-alloying Behavior of Mg–Al alloy in Sulphuric Acid and Acetic Acid Aqueous Solutions

Materials

Yinghui Wei¹  Shengqiang Yang²  Yonggang Li² 

[1] College of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China;College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China;

关键词: acid solutions;    SEM;    acid corrosion;    de-alloying;   

DOI  :  10.3390/ma12132046

来源: DOAJ

【 摘 要 】

The fabricated Mg−Al alloy consists of α-Mg phase and Mg−Mg₁₇Al₁₂ eutectic phase. The corrosion behavior of cast Mg−Al alloy in sulphuric acid (H₂SO₄) and acetic acid (HAc) aqueous solutions was investigated. The Mg−Al alloy shows general corrosion in H₂SO₄ solution, and the α-Mg dendrites revealed a slightly faster corrosion rate than that of the eutectics. In HAc solution, the alloy shows an obvious selective corrosion characteristic, with the α-Mg dendrites being corroded preferentially. Grain orientation plays an important role in corrosion behavior of the alloy in the HAc solutions.

【 授权许可】

Unknown