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Tribocorrosion behavior and mechanism of micro‐arc oxidation Ca/P coating on nanocrystallized magnesium alloys
Author(s) -
Yang Jinghua,
Gu Yanhong,
Zhou Xiaomao,
Zhang Yuping
Publication year - 2018
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201709674
Subject(s) - tribocorrosion , materials science , corrosion , metallurgy , magnesium alloy , coating , alloy , composite material , electrochemistry , electrode , chemistry
In order to improve the corrosion and tribocorrosion resistance of magnesium alloy used as implant materials in human body, a calcium phosphate (Ca/P) containing coating was obtained by micro‐arc oxidation (MAO) on the nano‐layer pretreated by ultrasonic cold forging technology (UCFT). The metallographic structure of the UCFT‐treated sample was observed by metallographic microscope. The thickness of the nanolayer is about 100 µm and the grain size has become smaller than that of the untreated sample. The results show that OCP increases gradually under corrosion and will be up and down under tribocorrosion. PDP data show that the current density of UCFT‐MAO sample is the lowest under corrosion and tribocorrosion, and the current density of the sample under tribocorrosion is higher than that under corrosion. EIS shows that the impedance magnitude (|Z|) of the samples under tribocorrosion is much lower than that of under corrosion. These results indicate that corrosion resistant performance of the UCFT‐MAO sample can be reduced by wear. And a physical model of the tribocorrosion behavior was proposed.