烘干温度对热镀锌层钝化膜形貌及耐腐蚀性能的影响  

Effects of Drying Temperature on Morphology and Corrosion Resistance of Zinc Coating Passivation Films

作　　者：李黎[1] 郭志飞[1] 张建强[1] 刘再旺[1] 崔桂彬[1] 宿振鹏 

机构地区：[1]首钢技术研究院,北京100041 [2]首钢京唐公司营销管理部,河北唐山063200

出　　处：《电镀与精饰》2014年第6期25-28,共4页Plating & Finishing

摘　　要：在3.5%NaCl溶液中,用电化学方法测定了未钝化热镀锌层、钝化后烘干θ为270℃、320℃镀锌层的极化曲线;对三种镀层进行96h中性盐雾试验;用扫描电子显微镜对2种钝化膜表面形貌及成分进行分析。结果表明,在3.5%NaCl溶液中,钝化镀层耐腐蚀性能明显优于未钝化镀层;烘干温度过高,导致钝化膜开裂严重,镀层耐腐蚀性能降低。Polarization curves for zinc coating without passivation and zinc coating with passivation dried at 270 ℃ and 320 ℃ were measured by electrochemical measurement in 3.5 % NaC1 solution and 96 h neutral salt spray test were also carried out on these coatings. Surface morphology and composition of the passivation films were investigated by scanning electron microscope. The results revealed that coatings with passivation showed much higher corrosion resistance than those without passivation. Much higher drying temperature would lead to severe cracking of the passivation film and reduce the corrosion resistance.

关 键 词：烘干温度 热镀锌 钝化膜 极化电阻 耐腐蚀性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]