镀锌三价铬钝化膜的X射线光电子能谱研究  

X-ray photoelectron spectroscopic studies on passivation films on zinc plating coatings formed by trivalent chromium passivating agents

作　　者：卢进[1,2] 吴育忠[2] 马冲 

机构地区：[1]广东省技术经济研究发展中心,广东广州510070 [2]华南师范大学化学系,广东广州510631 [3]佛山南海美德耐化工原料有限公司,广东佛山528247

出　　处：《电镀与涂饰》2009年第4期26-28,共3页Electroplating & Finishing

摘　　要：采用中性盐雾试验比较了酸性氯化钾镀锌层经3种不同钝化剂钝化处理后所得钝化膜的耐蚀性,采用X射线光电子能谱研究了不同钝化膜的厚度及组成。结果表明,SpectraMATETM 25彩色钝化所得钝化膜的耐蚀性最好,可以经受336 h以上的中性盐雾试验,TRI-V121钝化膜的耐蚀性次之,TRI-V120钝化膜最差。TRI-V120和TRI-V121蓝白钝化所得钝化膜的主要组成为Cr2O3,厚度均为200 nm左右,但后者的Cr含量较高,因此具有较高的耐蚀性;经SpectraMATETM 25彩色钝化所得钝化膜的组成为Cr(OH)3和Cr2O3,厚度约为800 nm,膜层厚是其具有高耐蚀性的主要原因。The corrosion resistance of passivation films on acid potassium chloride zinc plating coatings formed by three trivalent passivating agents was compared based on neutral salt spray （NSS） tests. The thickness and composition of the passivation films were studied by X-ray photoelectron spectroscopy （XPS）. The corrosion resistance of the passivation films formed by different passivating agents are in the following descending order, SpectraMATE^TM 25 〉 TRI-V121 〉 TRI-V120. The passivation film formed by SpectraMATE^TM 25 iridescent passivating agent can endure over 336 h in NSS test. The passivation films formed by TRI-V120 and TRI-V121 blue/white passivating agents are mainly composed of Cr2O3 and have a similar thickness of ca.200 nm. The passivation film formed by TRI-V121 contains more Cr than that formed by TRI-V120, and thus has higher corrosion resistance. The passivation film formed by SpectraMATETM 25 is composed of Cr2O3 and Cr（OH）3,and has a thickness of ca.800 nm, which contributes to its superior corrosion resistance.

关 键 词：酸性氯化钾镀锌 三价铬钝化膜 组成 厚度 耐蚀性 中性盐雾试验 X射线光电子能谱 

分 类 号：TQ153.1[化学工程—电化学工业] TG178[金属学及工艺—金属表面处理]