Comparative study of microstructure and corrosion resistance ofelectroless Ni-W-P coatings treated by laser and furnace-annealing

来源期刊：中国有色金属学报(英文版)2010年第6期

论文作者：刘宏 郭荣新 宗云 何冰清 刘铸

文章页码：1024 - 1031

Key words：electroless Ni-W-P coating; laser-treatment; annealing; nano-crystallization; corrosion

Abstract: A comparative study of amorphous electroless Ni-W-P coatings on mild steel substrate treated by a high power diode laser and furnace annealing was presented. Effects of different laser operating parameters and furnace-annealing conditions on microstructures, in terms of crystallisation, pores formation and grain growth, were investigated using SEM/EDX and XRD. Corrosion behaviours of these coatings before and after various treatments were evaluated with anodic polarisation in 0.5 mol/L H₂SO₄ solution. The results show that the furnace-annealing produces either a mixture of nanocrystallined Ni and amorphous phases or precipitated Ni₃P phase distributed in nanocrystallined Ni-based matrix, depending on annealing temperatures, whilst the laser treatment under the operating conditions only produces nanocrystallined Ni-based matrix with Ni₃P precipitates. Corrosion performance of the coatings treated by both the laser and the furnace-annealing is dependent on the annealing temperature and laser operating conditions. Corrosion mechanisms of various treated-coatings were discussed in the consideration of phase constitutes and proportion, grain sizes of both Ni and Ni₃P phases, pores formation and residual stresses.

基金信息：the Natural Science Foundation of Shandong Province, China
UK Northwest Science Council through Northwest Laser Engineering Consortium (NWLEC)