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镁合金表面超疏水Ni-P/Ni(NO)(OH)多层防护涂层的制备及其耐蚀性

Fabrication and Corrosion Resistance of a Superhydrophobic Ni-P/Ni(NO)(OH) Multilayer Protective Coating on Magnesium Alloy.

作者信息

Yuan Jing, Li Pei, Yuan Rui, Mao Duolu

机构信息

College of Physics Electronic Information Engineering, Qinghai University for Nationalities, Xining, Qinghai 810007, P R China.

Department of Orthopedic, Qinghai Provincial People's Hospital, Xining, Qinghai 810007, P R China.

出版信息

ACS Omega. 2020 Sep 18;5(38):24247-24255. doi: 10.1021/acsomega.0c02196. eCollection 2020 Sep 29.

DOI:10.1021/acsomega.0c02196
PMID:33015441
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7528178/
Abstract

A superhydrophobic multilayer coating with excellent corrosion resistance has been fabricated on an AZ61 magnesium alloy through electroless plating and hydrothermal treatment. The surface morphologies, chemical characteristics, wettabilities, and corrosion resistance of the multilayer coating were characterized and discussed. The results show that the electroless Ni-P coating on the magnesium alloy exhibits a nodular structure with micropores and lower corrosion resistance. However, a dense Ni(NO)(OH) layer, a porous Ni(NO)(OH) nanostructure layer, and a stearic absorbing layer are grown on the surface of the Ni-P coating with superhydrophobic characters and higher corrosion resistance after hydrothermal treatment. Furthermore, the water contact angle and corrosion resistance of the multilayer coating showed a trend of first increasing and then decreasing as the hydrothermal reaction time increases. The optimum hydrothermal reaction time is 15 h, and the multilayer coating prepared under this condition has the highest corrosion resistance and the highest contact angle. In addition, the protection mechanism of the multilayer coating is discussed, and the formation of the dense Ni(NO)(OH) layer and the stearic absorbing layer effectively improved the corrosion resistance of the multilayer coating.

摘要

通过化学镀和水热处理在AZ61镁合金上制备了一种具有优异耐腐蚀性的超疏水多层涂层。对多层涂层的表面形貌、化学特性、润湿性和耐腐蚀性进行了表征和讨论。结果表明，镁合金上的化学镀Ni-P涂层呈现出带有微孔的结节状结构，耐腐蚀性较低。然而，经过水热处理后，在Ni-P涂层表面生长出致密的Ni(NO)(OH)层、多孔的Ni(NO)(OH)纳米结构层和硬脂酸吸附层，具有超疏水特性和更高的耐腐蚀性。此外，随着水热反应时间的增加，多层涂层的水接触角和耐腐蚀性呈现出先增大后减小的趋势。最佳水热反应时间为15小时，在此条件下制备的多层涂层具有最高的耐腐蚀性和最大的接触角。此外，还讨论了多层涂层的保护机制，致密的Ni(NO)(OH)层和硬脂酸吸附层的形成有效地提高了多层涂层的耐腐蚀性。

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