Investigations on the Influence of Annealing on Microstructure and Mechanical Properties of Electrodeposited Ni-Mo and Ni-Mo-W Alloy Coatings

Coatings

Yin Wang¹  Chao Zhang²  Wudong Si³  Sichao Dai³  Da Shu³ 

[1]Guizhou Communications Polytechnic, Guiyang 551403, China

[2]School of Materials Science and Engineering, Nanjing Institute of Technology, Nanjing 211167, China

[3]School of Mechanical Engineering, Anhui Polytechnic University, Wuhu 241000, China

关键词: electrodeposition;    Ni-Mo-W coatings;    annealing;    microstructure;    mechanical properties;   

DOI  :  10.3390/coatings11111428

来源: DOAJ

【 摘 要 】

Ni-Mo and Ni-Mo-W coatings were electrodeposited on a stainless steel sheet, and then were annealed at 200, 400, and 600 °C. The effect of annealing heat treatment on the microstructure of Ni-Mo and Ni-Mo-W electrodepositions, their nano-hardness, and tribological properties were investigated. It was revealed that the average crystalline are refined and phase separation are promoted with formation of Mo-W related intermetallic precipitates at temperature exceed 400 °C on account of the co-existence of Mo-W elements within Ni-Mo-W coatings. Annealing heat treatment leads to hardening, and the hardness and elastic module increase significantly. The grain boundary (GB) relaxation and hard precipitated intermetallic particles are responsible for the annealing-induced hardening for ≤400 °C annealed and 600 °C annealed Ni-Mo-W coatings, respectively. In addition, both adhesive wear and abrasive wear are observed for coatings, and abrasive wear becomes predominant when annealing temperature up to 600 °C. The wear resistance of coatings is improved eventually by formation of a mixture of lubricated oxides upon annealing at 600 °C and the enhancement of H/E ratio for ≤400 °C annealed Ni-Mo-W coatings.

【 授权许可】

Unknown