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Coatings 2019, 9(2), 113; https://doi.org/10.3390/coatings9020113

Corrosion Behavior of Hydrotalcite Film on AZ31 Alloy in Simulated Body Fluid

1
Key Laboratory of Fluid and Power Machinery of Ministry of Education, School of Materials Science and Engineering, Xihua University, Chengdu 610039, China
2
National Engineering Center for Corrosion Control, Institute of Metal Research, Chinese Academy of Sciences, 62 Wencui Road, Shenyang 110016, China
3
Jiangsu Steel Tube Co., Ltd., Wuxi 214121, China
*
Author to whom correspondence should be addressed.
Received: 6 December 2018 / Revised: 3 February 2019 / Accepted: 7 February 2019 / Published: 12 February 2019
(This article belongs to the Special Issue Surface Modification of Metallic Powders)
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Abstract

The hydrotalcite (HT) film is a promising bioactive coating for magnesium alloys. In the present study, we investigate the corrosion behavior of HT film in the simulated body fluid (SBF), and compare with which in NaCl solution. The HT film can provide a very plummy initial protection to the AZ31 alloy in SBF. The corrosion behavior of the HT film in the two solutions is quite different. When in 0.1 mol·L−1 NaCl solution, the film is dissolved gradually, and filiform corrosion is predominant after 3 days immersion. While in Hank’s solution, the thickness and composition of the film are changed. A corrosion products layer mainly consisted of Mg/Ca–PO43−/HPO42−, and minor of CaCO3 is deposited on the top of HT film, which enhances the barrier effect of the HT film. As a result, except for local pit corrosion at several active places, most of the area of the coated sample still remains integral even after immersion for 15 days. It is demonstrated that the HT film has better corrosion protection effect in SBF than in NaCl solution. View Full-Text
Keywords: magnesium alloy; hydrotalcite film; simulated body fluid; corrosion magnesium alloy; hydrotalcite film; simulated body fluid; corrosion
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Chen, J.; Kang, K.; Song, Y.; Han, E.-H.; Ma, S.; Ao, J. Corrosion Behavior of Hydrotalcite Film on AZ31 Alloy in Simulated Body Fluid. Coatings 2019, 9, 113.

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