Anti-Corrosion Performance of the NiCrAlY Coatings Deposited by Two Different Spraying Technologies

Anti-Corrosion Performance of the NiCrAlY Coatings Deposited by Two Different Spraying Technologies Li Shu-qing*, Li Qi-lian, Yang Wei-hua, Ma Guo-jia (Lab of Power Beam Processing Technology,Aviation Industry Corporation of China Manufacturing Technology Institute. No.1Dongjunzhuang, North Baliqiao, Chaoyang District, Beijing 100024, PR China) Abstract: To study the coating's anti-corrosion performance,the NiCrAlY coatings were deposited on 38CrMoAl substrate by both a laser hybrid plasma spraying (LHPS) and an air plasma spraying (APS) technology in this paper. Microstructure and anti-corrosion performance of NiCrAlY coatings were studied using an optical microscope, X-ray diffraction, a scanning electron microscope, and the Neutral Salt Spray(NSS) test. The test results indicate that the LHPS coatings exhibit less pores and micro-cracks, more dense and homogeneous microstructure, higher bonding strength and more excellent anti-corrosion performance than the APS coatings. The main corrosion mechanism of the NiCrAlY coatings deposited by the two different spraying technologies are all cavity corrosion. Key Words: laser-hybrid plasma spraying; NiCrAlY coating; anti-corrosion performance