微量Ge对大气下液态Sn抗氧化性能的影响  

INFLUENCE OF TRACE Ge ON OXIDATION OF LIQUID TIN IN ATMOSPHERE

作　　者：贡国良[1] 冼爱平[1] 

机构地区：[1]中国科学院金属研究所沈阳材料科学国家(联合)实验室,沈阳110016

出　　处：《金属学报》2007年第7期759-763,共5页Acta Metallurgica Sinica

基　　金：国家高技术研究发展计划项目2002AA322040;2006年沈阳市科技基金~~

摘　　要：采用观察液态Sn表面氧化行为和刮取表面氧化渣的方法,研究了微量元素Ge对液态Sn在大气和250℃条件下表面抗氧化性能的影响,并与纯Sn的氧化行为进行对比;利用X射线光电子能谱仪(XPS)、扫描电子显微镜(SEM)研究了合金表面元素的含量、价态,及合金氧化后的表面形貌．结果表明:当微量元素Ge浓度达到0．01%时(质量分数),大气下液态Sn表面具有很好的抗氧化性能,同时微量元素在液态Sn表面高度富集．XPS分析表明:表面富集的Ge以4价氧化物形式存在．静态液面氧化时,Ge在液态Sn中迅速偏析,并形成一种保护性的致密氧化膜,是提高液态Sn抗氧化性能的原因．The oxidation behviours of liquid tin with and without trace Ge at 250 ℃ in atmosphere were studied by both observation and removing dross from the surface periodically. The surface composition, atom＇s valence state and the surface morphology were researched by both XPS and SEM. The results showed that the liquid tin has an excellent oxidation resistance in atmosphere when the Ge content was up to 0.01% （mass fraction）. XPS analysis presents that trace Ge segregated highly on surface, and existed as an oxide with positive four valences. Based on the results, a mechanism why trace Ge can improve the oxidation resistance of liquid tin was suggested, that is the trace Ge rapidly segregated on the surface of liquid tin when it was melting, then it formed a layer of protective and density oxide film to resist future oxidation of liquid tin in atmosphere.

关 键 词：SN 氧化 液态金属 焊料 

分 类 号：TG172[金属学及工艺—金属表面处理]