Journal
MATERIALS
Volume 14, Issue 23, Pages -Publisher
MDPI
DOI: 10.3390/ma14237140
Keywords
Mg-Ca alloy; intermetallic; microgalvanic corrosion; corrosion resistance
Categories
Funding
- China Postdoctoral Science Foundation [2020M682337]
- Certificate of Postdoctoral Research Grant in Henan Province [201903011]
- National Key Research and Development Program of China [2016YFB0301001, 2016YFB0301101]
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The study found that the Mg2Ca phase acts as a microanode in microgalvanic corrosion in both NaCl and Na2SO4 solutions, accelerating corrosion of the adjacent Mg matrix, while Cl- and SO42- have different sensibilities to microgalvanic corrosion.
As a kind of potential biomedical material, Mg-Ca alloy has attracted much attention. However, the role of Ca-containing intermetallics in microgalvanic corrosion is still controversial. In 0.6 mol/L NaCl and Na2SO4 solutions, the microgalvanic corrosion behavior of the second phase and Mg matrix of Mg-Ca and Mg-Al-Ca alloys was examined. It was confirmed that the Mg2Ca phase acts as a microanode in microgalvanic corrosion in both NaCl and Na2SO4 solutions, with the Mg matrix acting as the cathode and the Al2Ca phase acting as the microcathode to accelerate corrosion of the adjacent Mg matrix. It was also found that Cl- and SO42- have different sensibilities to microgalvanic corrosion.
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