Corrosion and Mechanical Behavior of the As-Cast and Solid-Solution-Treated AM50 Magnesium Alloy in Different Media

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Abstract
Hydrogen embrittlement and the anodic dissolution mechanism are two important aspects of the corrosion behavior of magnesium alloys. Here, to evaluate the effects of these two aspects on the corrosion failure of magnesium alloys under stress, the stress and corrosion behaviors of the AM50 magnesium alloy in air, deionized water, and NaCl solution after solid-solution (T4) treatment were investigated by X-ray diffraction, scanning electron microscopy, slow strain rate tensile testing, and vacuum dehydrogenation. The as-cast AM50 magnesium alloy was mainly composed of the α-Mg and β-Mg17Al12 phases. After T4 treatment, the amount of the β-Mg17Al12 phase was significantly reduced, and only a small amount existed at the grain boundaries. After T4 treatment, the stress corrosion resistance in deionized water improved, but it decreased in an NaCl environment. Dehydrogenation experiments showed that the effect of hydrogen on the corrosion process was weakened owing to the decrease of the β-Mg17Al12 phase after solution treatment. The effects of hydrogen embrittlement and the anodic dissolution mechanism on the corrosion behavior of the AM50 magnesium alloy under stress were different. In deionized water, the hydrogen embrittlement mechanism played the major role, while the anodic dissolution mechanism played the major role in the presence of Cl− ions.
Funding Information
  • National Natural Science Foundation Youth Science Foundation Project of China (61901007, JJKH20210036KJ, JJKH20230062KJ, YDZJ202101ZYTS172, YDZJ202201ZYTS601, 202016003)
  • the Science and Technology Research Project of Education Department of Jilin Province, China, (61901007, JJKH20210036KJ, JJKH20230062KJ, YDZJ202101ZYTS172, YDZJ202201ZYTS601, 202016003)
  • the Natural Science Foundation of Jilin Province, China, (61901007, JJKH20210036KJ, JJKH20230062KJ, YDZJ202101ZYTS172, YDZJ202201ZYTS601, 202016003)
  • Young Science and Technology Innovation Team of Beihua University (61901007, JJKH20210036KJ, JJKH20230062KJ, YDZJ202101ZYTS172, YDZJ202201ZYTS601, 202016003)

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