Journal
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
Volume 54, Issue -, Pages 1-13Publisher
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2020.02.074
Keywords
Magnesium alloy; Ammonium; Corrosion kinetics; Knife-cut like corrosion
Funding
- Science and Technology Support Plan for Youth Innovation of Colleges in Shandong Province [DC2000000891]
- National Natural Science Foundation of China [51701102, 51601182]
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The influence of NH4+ ions on the corrosion behavior of AZ31 magnesium alloy was investigated by immersion test, hydrogen evolution, electrochemical methods and morphology observation. The results demonstrate the acceleration effect of NH(4)(+ )on corrosion of AZ31 magnesium alloy due to the disruption of protective MgO film in NH4+-containing solution. The loose and cracked corrosion products of AZ31 magnesium alloy in NH4+-containing solutions are mainly composed of (Mg0.833Al0.167)(OH)(2)(CO3)(0.083)center dot 0.75H(2)O and Mg-5(CO3)(4) (OH)(2)center dot 5H(2)O. When the NH 4 ' concentration is lower than 0.01 M, knife-cut like corrosion occurs in some active area of the surface due to the partial dissolution of MgO layer. As the NH4+ concentration is increased to 0.1 M, the MgO layer is completely disrupted, resulting in the occurrence of uniform corrosion. Both cathodic and anodic reactions are accelerated by NH4+ ions, while the effect of original pH values on the reaction kinetics can be neglected in NH4+-containing solutions. (C) 2020 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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