热处理对Ni-B涂层耐腐蚀性能的影响
Effect of Heat Treatment on Corrosion Resistance of Ni-B Coating
孙万昌1, 张 磊2, 谭明锋1, 丁 晋1
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作者单位：1. 西安科技大学 材料科学与工程学院, 陕西 西安 710054; 2. 中国船舶重工集团 第十二研究所, 陕西 兴平 713102
中文关键字：化学镀； Ni-B涂层； 热处理； 耐蚀性
英文关键字：electroless deposition; Ni-B alloy; heat treatment; corrosion resistance
中文摘要：采用低温化学镀液相沉积技术，以45钢为基体材料，制备了Ni-B合金镀层。利用光学显微镜观察了镀层的微观形貌，借助X射线衍射仪分析了热处理前后Ni-B镀层相结构的变化，采用电化学极化曲线表征了热处理前后镀层的腐蚀过电位。结果表明：Ni-B镀层与45钢基体结合较好，界面连续、均匀、平整，表面形貌呈菜花状的胞状结构。NaBH4的添加量为0.9 g/L时，Ni-B镀层呈非晶态，Ni-B镀层的耐蚀性最好。热处理后，镀层由非晶态向晶态转变，镀层的耐蚀性下降。
英文摘要：Electroless Ni-B alloy coating was prepared on medium carbon steel sheet using a low temperature electroless bath. The surface and cross-section morphologies of Ni-B alloy coating were observed with optical microscope. The influences of heat treatment on phase structure and corrosion resistance of the coating were studied. The results show that Ni-B coating shows a good adhesion to the substrate. The structure of as-plated Ni-B coating is amorphous, and the coating shows the best corrosion resistance. However, the corrosion resistance of Ni-B coating decreases after heat treatment.