表面技术Issue(2)：34-37,133,5.DOI:10.16490/j.cnki.issn.1001-3660.2015.02.007
AZ91 D镁合金表面Ni-P/Ni-Sn-P双镀层的制备与性能研究
Study on the Preparation and Properties of Ni-P/Ni-Sn-P Duplex Coatings on AZ91 D Magnesium Alloy
刘秋月 1张修庆 1浦海洲 1徐金鹏1
作者信息
- 1. 华东理工大学 机械与动力工程学院，上海200237
- 折叠
摘要
Abstract
ABSTRACT:Objective To improve the corrosion resistance of AZ91D magnesium alloy and expand the range of application. Methods Ni-P coating was first prepared on AZ91D magnesium alloy by electroless plating, then Ni-Sn-P coating was prepared on this basis, forming Ni-P/Ni-Sn-P duplex coatings. The microstructure and corrosion resistance of Ni-P/Ni-Sn-P duplex coatings were investigated and compared with those of Ni-P coating. Results The results showed that the surface of Ni-P/Ni-Sn-P duplex coatings was more uniform, compact, with fewer defects, lower porosity and amorphous structure. The corrosion potential of the secondary Ni-Sn-P coating was about -0. 77 V, which was lower than that of the first Ni-P coating (-0. 68 V). The potential difference between the two coatings formed micro etching point, with Ni-P coating as the cathode, and Ni-Sn-P coating as the an-ode, and the anode was corroded first. Conclusion The outer layer of Ni-Sn-P coating in the Ni-P/Ni-Sn-P duplex coatings could protect the first Ni-P coating from corroding and diffuse the corrosion current in the horizontal direction, thus greatly enhancing the corrosion resistance of AZ91D magnesium alloy.关键词
AZ91 D镁合金/Ni-P镀层/Ni-P/Ni-Sn-P双镀层/耐腐蚀性能Key words
AZ91D magnesium alloy/Ni-P coating/Ni-P/Ni-Sn-P duplex coatings/corrosion resistance分类
化学化工引用本文复制引用
刘秋月,张修庆,浦海洲,徐金鹏..AZ91 D镁合金表面Ni-P/Ni-Sn-P双镀层的制备与性能研究[J].表面技术,2015,(2):34-37,133,5.
