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Materials Science and Technology Volume 38, 2022 - Issue 18
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Research Article

SmCl3’s effect on plasma electrolytic oxidation coating’s corrosion characteristics on AZ91D

XinYue LanSchool of New Engineering and Materials, Southwest Petroleum University, Chengdu, People’s Republic of China
,
Dan XiongSchool of New Engineering and Materials, Southwest Petroleum University, Chengdu, People’s Republic of China
,
Ping WangSchool of New Engineering and Materials, Southwest Petroleum University, Chengdu, People’s Republic of ChinaCorrespondence[email protected]
ORCID Iconhttps://orcid.org/0000-0002-1574-9984
ORCID Icon,
Ting WuSchool of New Engineering and Materials, Southwest Petroleum University, Chengdu, People’s Republic of China
,
YanFei DuanSchool of New Engineering and Materials, Southwest Petroleum University, Chengdu, People’s Republic of China
,
Zhao YangSchool of New Engineering and Materials, Southwest Petroleum University, Chengdu, People’s Republic of China
&
Dong XiangSchool of New Engineering and Materials, Southwest Petroleum University, Chengdu, People’s Republic of China
 show all
Pages 1585-1596 | Received 23 Feb 2022, Accepted 17 Jun 2022, Published online: 05 Jul 2022
 
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Abstract

Rare earth salt SmCl3 was added to the electrolyte to improve the corrosion performance of the AZ91D magnesium alloy plasma electrolytic oxidation (PEO) coating. The influence of SmCl3 on coating formation, morphology and performance was investigated. The results showed that adding SmCl3 can not only refine the discharge holes but also improve the coating’s formation efficiency and its’ combination with the substrate. Potentiodynamic polarisation (PDS) and electrochemical impedance spectroscopy (EIS) tests showed that the corrosion characteristics of the PEO coating were greatly improved with SmCl3’s addition. The corrosion current density decreased from 8.208 × 10−4 to 3.733 × 10−8 A cm−2 when the presence of optimum level of SmCl3 in solution (0.25 g L−1). Cyclic polarisation test indicated that the pitting corrosion of AZ92D was improved.

Disclosure statement

No potential conflict of interest was reported by the authors.

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