High corrosion and wear resistant electroless Ni–P gradient coatings on aviation aluminum alloy parts  

作　　者：Bo Wang Jiawei Li Zhihui Xie Gengjie Wang Gang Yu 

机构地区：[1]College of Chemistry and Chemical Engineering,Hunan University,Changsha 410012,China [2]Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province/College of Chemistry and Chemical Engineering,China West Normal University,Nanchong 637002,China [3]Zhongchuan Machinery Ltd.Co.,Aero Engine Corporation of China,Changsha 410200,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2024年第1期155-164,共10页矿物冶金与材料学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (No.52271073)。

摘　　要：A Ni–P alloy gradient coating consisting of multiple electroless Ni–P layers with various phosphorus contents was prepared on the aviation aluminum alloy. Several characterization and electrochemical techniques were used to characterize the different Ni–P coatings’ morphologies, phase structures, elemental compositions, and corrosion protection. The gradient coating showed good adhesion and high corrosion and wear resistance, enabling the application of aluminum alloy in harsh environments. The results showed that the double zinc immersion was vital in obtaining excellent adhesion (81.2 N). The optimal coating was not peeled and shredded even after bending tests with angles higher than 90°and was not corroded visually after 500 h of neutral salt spray test at 35℃. The high corrosion resistance was attributed to the misaligning of these micro defects in the three different nickel alloy layers and the amorphous structure of the high P content in the outer layer. These findings guide the exploration of functional gradient coatings that meet the high application requirement of aluminum alloy parts in complicated and harsh aviation environments.

关 键 词：aluminum alloy ELECTROLESS nickel coating CORROSION ADHESION 

分 类 号：TG174.4[金属学及工艺—金属表面处理]