Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第14卷    第7期    总第64期    2004年7月

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文章编号:1004-0609(2004)07-1217-11
铅锡合金表面钝化层的XPS研究
徐  璟1,李晓刚1, 2, 王泽力1, 董超芳1

( 1. 北京科技大学 材料科学与工程学院 腐蚀与防护中心, 
北京 100083;
2. 中国科学院 金属研究所 金属腐蚀与防护国家重点实验室, 沈阳 110016
)

摘 要: 采用X射线光电子能谱(XPS)对铅锡合金表面钝化层的组分与结构进行分析,目的是要确定钝化层中各元素的化学价态和存在形式, 并试图明确锡对钝化膜导电能力的影响。 结果表明: 钝化膜具有分层结构, 表层由SnO2, SnO, PbSO4, PbOx(1<x<2)和PbOx·Sn1-xO2组成,内层为SnO2, SnO, PbO, PbOx和PbOx·Sn1-xO2。内层钝化膜的导电性优于表层, 锡能促进生成电阻远小于PbSO4和PbO的铅的过渡氧化物PbOx(1<x<2), 从而提高其电导率。但是, 内层的物质构成和分布并不均匀, 出现了非导电区(极少量)和导电区并存的现象, 而外层并没有类似情况发生。 钝化膜自外向内含铅量和含锡量均呈上升趋势, 含氧量呈下降趋势,锡的增值幅度随母体含锡量的减少而增大, 但铅浓度的变化规律与之相反。

 

关键字: 铅锡合金; 钝化膜; XPS

XPS research on passive layers on Pb-Sn alloys
XU Jing1, LI Xiao-gang1,2
WANG Ze-li1, DONG Chao-fang1

1. Corrosion and Protection Center, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. The State Key Laboratory of Metals Corrosion and Protection, 
Metal Research Institute, Chinese Academy of Sciences, Shenyang 110016, China

Abstract: The composition and structure of the passive film on Pb-Sn alloys were studied by X-ray photo electron spectroscopy(XPS) in order to determine the chemical valence number and existing state of alloying elements in passive layers and to elucidate the effect of Sn content on the electronic conductivity of the passive layers. It is found that the passive film has two-layered structure with SnO2, SnO, PbSO4, PbOx(1<x<2) and PbOx·Sn1-xO2 in outer layer, and SnO2, SnO, PbO, PbOx and PbOx·Sn1-xO2 in inner layer. Sn can improve the formation of PbOx(1<x<2) which results in the increase of conductivity of the passive film. From outer layer to inner one, the contents of Sn and Pb increase and O content decreases.

 

Key words: lead-tin alloy; passive layer; XPS

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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