Influences of Al particles on the microstructure and property of electrodeposited Ni–Al composite coatings

• Published in: Applied surface science Vol. 292; pp. 620 - 625
• Main Authors: Cai, Fei, Jiang, Chuanhai
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.02.2014; Elsevier
• Subjects: Aluminum; Coatings; Composite coatings; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Corrosion prevention; Cross-disciplinary physics: materials science; rheology; Electrodeposition; Exact sciences and technology; Nickel; Ni–Al coating; Particulate composites; Physics; Residual stress; Surface layer; Texture; Electrodeposition; Ni–Al coating; Texture; Residual stress; Composite materials; Ni-Al coating; Nickel; Residual stresses; Microstructure; Film growth
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2013.12.021

•We prepared the Ni–Al composite coatings with high Al content with DC electro-deposition technique.•We systematically examined the surface morphology, Al content, texture, microstrain, residual stress and wear performance at 200°C of the Ni–Al coating.•We investigated the relationship between corrosion and the Al content and the texture. Ni–Al composite coatings with different contents of Al microparticles were prepared from a conventional Watt bath. The influences of Al particle loadings in the bath on the surface morphology, composition, texture, grain size, microstrain, residual stress and anti-corrosion of the Ni–Al composite coating were investigated. The friction coefficients of the coatings at 200°C were also evaluated by a pin-on-disctribometer. The results showed that the surface morphology of the coatings changed from pyramid+colonied structure to colonied structure with increasing Al particle loadings. The (200) preferred orientation for pure Ni coating evolved to random orientation with increasing Al particle loadings. The grain size obtained the minimum value of 72.28nm at Al particle loading of 100g/L and the microstrain of the coating increased with increasing the Al particle loadings. The incorporation of Al particles decreased the residual stress of the electro-deposited coating and all the coatings deposited at different Al particle loadings possessed low residual stress. As the Al particle loading increased, the anti-corrosion of the Ni–Al coatings increased owing to the combined effect of increasing Al content in the coatings and the texture evolution from (200) plane to (111) plane. The wear result suggested that the increasing Al particle content did not improve the wear performance of the Ni–Al composite coatings.