Ni coatings for corrosion protection of Mg alloys prepared by an in-situ micro-forging assisted cold spray: Effect of powder feedstock characteristics

• DOI: 10.1016/j.corsci.2021.109397
• Publication Date: 2021-03-16T17:51:13Z
• Authors: Ying-Kang Wei; Xiao-Tao Luo; Xin Chu; Yi Ge; Guo-Sheng Huang; Ying-Chun Xie; Ren-Zhong Huang; Chang-Jiu Li
• Keywords: Particle (ecology)

Abstract Three nickel (Ni) powders, i.e. gas-atomized spherical Ni (GA-Ni), carbonyl irregular Ni (C-Ni), and electrolytic dendritic porous Ni (E-Ni), were sprayed on magnesium alloys by an in-situ micro-forging assisted cold spray method. Although all deposited coatings present extremely low porosity, the C-Ni and E-Ni coatings reveal poorer inter-particle bonding than GA-Ni coating. Electrochemical tests reveal that the inter-particle gaps will act as fast pathways for the corrosive media to penetrate the coatings, thereby the GA-Ni coating with intimate inter-particle boundaries can isolate the corrosive media for 3000 h and the C-Ni and E-Ni coatings fail after