缓冲镍层对轧辊毛化铬镀层耐蚀性的影响

发布时间：2018-03-19 12:23

本文选题：轧辊　切入点：毛化铬层　出处：《电镀与涂饰》2017年15期 　论文类型：期刊论文

【摘要】：在轧辊用9Cr2Mo钢表面电沉积凸包状毛化铬层,并在毛化铬层与钢基体之间引入缓冲镍层。采用扫描电镜表征了镀铬钢和镀镍/铬钢表面镀层的表面形貌和截面形貌。通过电化学测量和中性盐雾(NSS)试验研究了缓冲镍层的引入对毛化铬镀层腐蚀行为的影响。结果表明,镀镍/铬钢的电化学腐蚀倾向更小。NSS试验后,镀铬钢表面有大量腐蚀产物堆积,其主要成分为FeO和少量铬的氧化物。铬镀层中贯穿性裂纹的存在使得腐蚀介质可以渗透其内部并侵蚀钢基体,产生的腐蚀产物可通过裂纹扩散至镀层表面。相对而言,镀镍/铬钢中生成的腐蚀产物较少,主要为铬的氧化物。由此可见,缓冲镍层的引入通过隔绝腐蚀介质通道,有效抑制了腐蚀产物的形成,进而改善凸包状毛化铬镀层的耐蚀性。
[Abstract]:Electrodeposition of convex cladding chromium layer on the surface of 9Cr2Mo steel for roller, The surface morphology and cross-section morphology of chromium plated steel and nickel / chromium-plated steel were characterized by scanning electron microscope. The results were studied by electrochemical measurement and neutral salt spray NSS. The effect of the introduction of buffer nickel layer on the corrosion behavior of chromium wool coating. The electrochemical corrosion tendency of nickel / chromium steel is smaller. After NSS test, a large number of corrosion products accumulated on the surface of chromium plated steel. The main components are FeO and a small amount of chromium oxide. The existence of penetrating cracks in chromium coating allows the corrosion medium to penetrate inside and erode the steel substrate, resulting in corrosion products that can diffuse to the surface of the coating through cracks. The corrosion products produced in nickel / chromium steel are less, mainly chromium oxides. It can be seen that the introduction of buffer nickel layer effectively inhibits the formation of corrosion products by isolating the corrosion medium channel. Thus, the corrosion resistance of convex-shaped chrome-furred coating is improved.
【作者单位】：上海交通大学金属基复合材料国家重点实验室;
【分类号】：TG333.17;TQ153.11

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