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为了改善316L不锈钢在高温酸性溶液中的耐蚀性,采用化学镀技术在316L不锈钢表面沉积高铜高磷Ni-Cu-P镀层。采用扫描电镜(SEM)、能谱仪(EDS)和X射线衍射仪(XRD)对其结构进行分析,利用极化曲线、阻抗谱(EIS)及浸泡腐蚀试验对其在高温酸性溶液中的耐蚀性进行研究。结果表明,Ni-Cu-P镀层由铜含量分别为19.98%和39.17%(质量分数)两种类型的胞状组织组成;在高温酸性溶液中,这种新型Ni-Cu-P镀层可显著改善316L不锈钢的耐蚀性;镀态镀层的耐蚀性优于热处理态的;镀态镀层和经673K热处理镀层的腐蚀机制是选择性腐蚀,而经773和873K热处理镀层的腐蚀机制为点腐蚀。
In order to improve the corrosion resistance of 316L stainless steel in high temperature acidic solution, electroless plating was used to deposit Ni-Cu-P coating with high Cu and P on 316L stainless steel. Its structure was analyzed by scanning electron microscopy (SEM), energy dispersive spectrometer (EDS) and X-ray diffractometer (XRD). Its polarization resistance, impedance spectroscopy (EIS) Erosion research. The results show that the Ni-Cu-P coating consists of two types of cellular structure with 19.98% copper and 39.17% (mass fraction) respectively. The new Ni-Cu-P coating can significantly improve 316L The corrosion resistance of stainless steel is better than that of heat treatment. The corrosion mechanism of plated coating and 673K heat treatment coating is selective corrosion, while the corrosion mechanism of 773 and 873K heat treatment coating is pitting corrosion.