Journal
CORROSION SCIENCE
Volume 185, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2021.109408
Keywords
Magnesium alloy; Silver; Corrosion; Cathodic activation; Redeposition
Funding
- National Nature Science Foundation of China [51601036, 52071067]
- Fundamental Research Funds for the Central Universities [N170204010]
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The study found that Ag significantly influences the corrosion behavior of Mg-Mn-Ag alloys, enhances cathodic activation, and results in a significant increase in the corrosion rate of the alloy with immersion time.
The effect of Ag on cathodic activation and corrosion behaviour of Mg-Mn-Ag alloys are investigated in the present work. During corrosion, Mg-Ag intermetallic phase undergoes dealloying to form porous Ag-rich remnant whereas Ag in the alloy matrix is dissolved to form Ag+ ions that subsequently redeposit on the alloy surface via displacement reaction with Mg to form Ag nanoparticles, which lead to significant cathodic activation. The cathodic activation is a self-catalysed process since enhanced cathodic activity promotes anodic dissolution which, consequently, results in further enhancement of cathodic activity. Thus, the corrosion rate of Mg-2 Mn-4Ag alloy increases significantly with immersion time.
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