期刊
SURFACE & COATINGS TECHNOLOGY
卷 206, 期 15, 页码 3350-3359出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2012.01.039
关键词
Electroless plating; Laser treatment; Ni-W-P; Corrosion; XPS
资金
- Shandong Provincial Natural Science Foundation, China [ZR2011EMM014]
- UK Northwest Science Council through Northwest Laser Engineering Consortium (NWLEC) [N00003]
An investigation of the microstructural and corrosion characteristics of electroless Ni-5.5 W-6.5P coatings on steel substrates after laser treatment in argon and air is presented. The microstructural characteristics of the coatings, in terms of crystallisation, grain size, microstrain, porosity as well as surface chemistry, were examined using quantitative X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). Electrochemical tests, using potentiodynamic polarisation in 0.5 M H2SO4 solution and electrochemical impedances spectroscopy (EIS) in 3.5% NaCl solution, were undertaken to evaluate the corrosion behaviour of the coatings. The results indicated that the laser-treated coatings consisted of nano-crystalline Ni and Ni3P phases, along with retained amorphous phase; further, the dimensions of the Ni crystallites were larger than those of Ni3P. The laser-treated coating in argon revealed the presence of submicron scale porosity, while no porosity was evident in the coating surface treated by laser in air. The uniform corrosion revealed in 0.5 M H2SO4 solution is mainly determined by the microstructural characteristics of the coating. Pitting corrosion in 3.5% NaCl solution depended on the amount of porosity on the surface. The laser-treated coating in air exhibited better corrosion resistance in both acidic and chloride environments than that laser-treated in argon. (C) 2012 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据