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采用极化曲线探讨了L245钢和L245钢基体表面Ni-Sn-P化学镀层的耐腐蚀性能;利用电子扫描显微镜和能谱分析仪观察了L245钢表面Ni-Sn-P化学镀层在高压釜酸性介质情况下腐蚀前后的表面形貌和成分,结合X射线、光电子能谱对腐蚀后Ni-Sn-P化学镀层表面的组成进行了XPS分析。结果表明:Ni-Sn-P化学镀层在3.5%NaCl溶液中的电化学性能很好,明显高于基体L245钢;Ni-Sn-P化学镀层在高压釜酸性介质腐蚀情况下,Ni、Sn元素溶解,P元素富集,腐蚀层区域均匀,没有出现像L245钢那样的腐蚀坑;高压釜腐蚀后的Ni-Sn-P化学镀层表面形成了由NiO2、NiO、NiCl2、Ni(OH)2、NiSO4、SnO2、SnO、Ni3(PO4)2和Sn3(PO4)4等化合物组成的保护膜,对提高Ni-Sn-P化学镀层的耐腐蚀性能起到了重要作用。
The corrosion resistance of Ni-Sn-P electroless plating on the surface of L245 steel and L245 steel was investigated by polarization curves. The effects of electroless Ni-Sn-P electroless plating on the acidity of autoclave were observed by scanning electron microscopy and energy spectrum analyzer. The surface morphology and composition of the electroless Ni-Sn-P electroless plating surface after X-ray and photoelectron spectroscopy were analyzed by XPS. The results show that the electrochemical performance of Ni-Sn-P electroless coating in 3.5% NaCl solution is very good, which is obviously higher than that of L245 steel. Under the acidic medium corrosion of Ni-Sn-P electroless plating, Dissolution, P element enrichment, uniform corrosion area, there is no corrosion pits like L245 steel; the corrosion of autoclave Ni-Sn-P electroless coating formed by the surface of NiO2, NiO, NiCl2, NiSO4, SnO2, SnO, Ni3 (PO4) 2 and Sn3 (PO4) 4 compound protective film, to improve the corrosion resistance of Ni-Sn-P chemical plating played an important role.