镀镉45钢磷化憎水螺母表面黑斑原因分析  

Reason analysis of black spots appearing on surface of cadmium-plated 45 steel nut after phosphating and hydrophobization

作　　者：谭瑶 杜娟 朱凯 陈黎 李新政 TAN Yao;DU Juan;ZHU Kai;CHEN Li;LI Xinzheng(AVIC Chengdu Aircraft Industrial(Group)Co.,Ltd.,Chengdu 610091,China)

机构地区：[1]航空工业成都飞机工业(集团)有限责任公司,四川成都610091

出　　处：《电镀与涂饰》2023年第17期24-28,共5页Electroplating & Finishing

摘　　要：通过宏微观形貌观察、能谱分析、耐蚀性检测及复现试验,对镀镉45钢磷化憎水螺母表面黑斑的性能及形成原因进行分析。结果表明,黑斑处存在Ca元素富集的圆形絮状结晶。磷化槽边缘的“水垢”未及时清理而掉落磷化槽中,其中的Ca^(2+)参与磷化反应而形成圆形絮状结晶,宏观下呈现黑斑特征。The properties and cause of black spots appearing on the surface of cadmium-plated 45 steel nut after phosphating and hydrophobization were analyzed by macro-and micro-morphology observation,energy-dispersive spectroscopy,corrosion resistance testing,and recurrence test.The results showed that there were round and calcium-enriched crystals at the black spots.It was found that the scale-like matters formed at the edge of phosphating tank were not cleared duly and dropped into the tank.Hence some round and flocculent crystals were formed for the involvement of Ca^(2+)during the phosphating process,and black spots occurred macroscopically.

关 键 词：中碳钢 螺母 镀镉 锌系磷化 黑斑缺陷 故障处理 

分 类 号：TQ153.17[化学工程—电化学工业] V261.932[航空宇航科学与技术—航空宇航制造工程]