Corrosion resistance of Mg-4.0Zn-2.0Sr-0.4Ca alloy composite coating

doi:10.13251/j.issn.0254-6051.2022.04.037

Abstract

Abstract: Through environmentally friendly anodizing process and polymer deposition technology, a composite coating of anodic oxide film, SiO₂ sol-gel, polydopamine (PDA) and chitosan (CS) were prepared layer by layer on the surface of Mg-4.0Zn-2.0Sr-0.4Ca alloy. The morphology of the coating was observed by using scanning electron microscope (SEM), the phase composition was determined by using X-ray diffractometer (XRD), and the corrosion resistance was tested by means of electrochemical testing and in SBF immersion. The results show that the composite coating is compact and complete without any defects. In the SBF solution, the composite coating gradually cracks and breaks with the prolongation of corrosion time, resulting in smaller corrosion pits, which shows the corrosion is controlled on the surface at a certain degree. However, the corrosion of uncoated Mg-4.0Zn-2.0Sr-0.4Ca alloy is mainly corrosion pits and local corrosion, and the corrosion intensifies with the prolongation of corrosion time. In addition, the corrosion current density, corrosion potential and average corrosion rate of the composite coating in SBF solution are 5.7039 μA/cm², -1.4203 V(vs SCE) and 0.163 g/(m²·h), which is better than that of the uncoated Mg-4.0Zn-2.0Sr-0.4Ca alloy, especially the average corrosion rate drops by more than 50%, which indicates that the prepared composite coating can significantly improve the corrosion resistance of the Mg-4.0Zn-2.0Sr-0.4Ca alloy.

Key words: Mg-4.0Zn-2.0Sr-0.4Ca alloy, surface modification, corrosion resistance, in vitro immersion

CLC Number:

TG174.44

Chen Zhijie, Cui Tong. Corrosion resistance of Mg-4.0Zn-2.0Sr-0.4Ca alloy composite coating[J]. Heat Treatment of Metals, 2022, 47(4): 213-218.

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