表面涂层和镀层受损后涂装电镀钢板的耐海洋大气腐蚀性能  

Marine Atmospheric Corrosion Resistance of Painted Electroplated Steel Plates after Damage of Surface Coating and Plating

作　　者：龚利华[1] 潘峰 GONG Lihua;PAN Feng(School of Materials Science and Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,China)

机构地区：[1]江苏科技大学材料科学与工程学院,镇江212003

出　　处：《机械工程材料》2022年第8期117-121,126,共6页Materials For Mechanical Engineering

摘　　要：采用划痕破坏表面涂层和镀层后,将涂装电镀锌钢板和电镀锌镍合金钢板在海洋大气环境中暴露2 a,研究了划痕附近的腐蚀产物微观形貌和元素分布,探讨了涂装电镀钢板表面涂层和镀层受损后的耐海洋大气腐蚀性能,并与原始电镀锌钢板和电镀锌镍合金钢板进行对比。结果表明:原始电镀锌镍合金钢板的耐海洋大气腐蚀性能比电镀锌钢板差,这与电镀时电镀锌镍合金钢板镀层中产生的裂纹有关;涂装后,虽然锌镍合金镀层中仍然存在裂纹,但划痕附近的腐蚀宽度小于电镀锌钢板,说明划痕破坏后的涂装电镀锌镍合金钢板的耐海洋大气腐蚀性能优于电镀锌钢板,这与涂装前磷化处理所形成的磷酸盐堵塞裂纹,同时涂层的存在使腐蚀介质只能通过划痕侧面和涂层缺陷处到达镀层,而使镀层中的镍发挥出提高热力学稳定性的优势有关。The micromorphology and element distribution of corrosion product near the scratch of painted electrogalvanized steel plate and electrogalvanized nickel alloy steel plate explored in the marine atmosphere for 2 a after damage of surface coating and plating by scratch. The marine atmospheric corrosion resistance of painted electroplated steel plates after damage of surface coating and plating was discussed, and compared with original electrogalvanized steel plate and electrogalvanized nickel alloy steel plate. The results show that the marine atmospheric corrosion resistance of original electrogalvanized nickel alloy steel plate was worse than that of electrogalvanized steel plate, which was related to cracks in electrogalvanized nickel alloy steel plate during electroplating. After painting, although cracks existed in the zinc nickel alloy plating, the corrosion width near scratch was less than that of electrogalvanized steel plate, indicating that the marine atmospheric corrosion resistance of plainted electrogalvanized nickel alloy steel plate after damage by scratch was better than that of electrogalvanized steel plate, which was related to the phosphate formed by phosphating treatment before painting plugging cracks, and the existence of coating making the corrosive medium reach the coating only through the scratch side and the coating defect, and the nickel in the coating playing an advantage of improving the thermodynamic stability.

关 键 词：电镀锌钢板 电镀锌镍合金钢板 涂装 划痕 耐海洋大气腐蚀性能 

分 类 号：TG174.4[金属学及工艺—金属表面处理]