Corrosion Behavior and Microstructure of Cu-Based Composite Coatings Deposited by Cold Spraying

Abstract

This study aimed to prepare Cu-based coatings with excellent corrosion resistance by cold spraying. Cu, Zn, and Al particles with different mass ratios were mechanically blended as the feedstock materials. The microstructure, element content, mechanical properties, and corrosion resistance of the coatings were investigated. Results showed that all the prepared coatings presented a dense microstructure. In addition, the thickness of the coatings exceeded 290 μm, and the existence of the “hammer effect” made the thickness and hardness of the coatings present an obvious negative correlation. Electrochemical test results indicated that changes in the element content could significantly affect the corrosion behavior of coatings. During the immersion period, the coatings containing Al exhibited better corrosion resistance.

Effect of Al2O3 on Microstructure and Corrosion Characteristics of Al/Al2O3 Composite Coatings Prepared by Cold Spraying

“…Cold spraying is a common method for preparing composite coatings [11]. Cold spraying technology is a surface coating technology developed based on the principles of gas dynamics and high-speed collision dynamics [12][13][14].…”

Effect of Process Parameters on Properties of Cold-Sprayed Zn–Al Composite Coatings

“…The deposition of the coating depends on the plastic deformation of the solid particles rather than the heat input [ 6 , 7 ]. For a particular material, the degree of plastic deformation depends on the particle velocity [ 8 ]. Based on the above discussion, cold-spraying technology is suitable for heat-sensitive materials [ 5 , 9 ], and appropriate process parameters can improve the particle deposition effect and coating performance [ 10 ].…”