Study on the Effect of the Coating Thickness on Corrosion Behavior of AZ91D Magnesium Alloy in m-SBF

The CaP/chitosan coating on AZ91D magnesium alloy substrate was prepared by electrophoretic deposition technique (EPD) and formation mechanism of the coating was also put forward. CaP /chitosan coating and micro-arc oxidation (MAO) film effectively protected the AZ91D magnesium alloy from corroding...

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Bibliographic Details
Published inInternational journal of electrochemical science Vol. 10; no. 7; pp. 6002 - 6013
Main Authors Zhang, Jie, Dai, Changsong, Wen, Zhaohui, Wei, Jie
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.07.2015
Subjects
AC impedance
CaP
chitosan
coating thickness
corrosion
magnesium alloy
chitosan
magnesium alloy
corrosion
CaP
AC impedance
coating thickness
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Summary:The CaP/chitosan coating on AZ91D magnesium alloy substrate was prepared by electrophoretic deposition technique (EPD) and formation mechanism of the coating was also put forward. CaP /chitosan coating and micro-arc oxidation (MAO) film effectively protected the AZ91D magnesium alloy from corroding in m-SBF. The composite coating had a good protection effect on AZ91D magnesium alloy when the thickness of CaP/chitosan coating was 0.40~ 0.61 mm and the effect of coating thickness on degradation rate of AZ91D magnesium alloy based CaP/chitosan material in m-SBF was elaborated. By analyzing the mathematical description of Faraday impedance, the CDC code of Nyquist equivalent circuit of two capacitive reactance loops and one inductance loop was Ru (Cd (Rct (CSRS (RLL))) that was more in tune with the physical meaning of the degradation behavior of the AZ91D magnesium alloy based CaP/chitosan material in m-SBF.
ISSN:1452-3981
1452-3981
DOI:10.1016/S1452-3981(23)17312-3