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| DISTRIBUTION OF ELEMENT BETWEEN SURFACE AND BULK OF MOLTEN Sn AND ITS EFFECT ON SURFACE PROPERTIES |
| by LIU Shuqi; ZHANG Qiyun; YANG Zhanlan (Department of Chemistry; Peking University); SHEN Dianhong (Institute of Physics; Academia Sinica; Beijing) |
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Cite this article:
by LIU Shuqi; ZHANG Qiyun; YANG Zhanlan (Department of Chemistry; Peking University); SHEN Dianhong (Institute of Physics; Academia Sinica; Beijing). DISTRIBUTION OF ELEMENT BETWEEN SURFACE AND BULK OF MOLTEN Sn AND ITS EFFECT ON SURFACE PROPERTIES. Acta Metall Sin, 1986, 22(3): 85-89.
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Abstract A study has been made of the distribution of an individual trace element, namely, P, As, Ga, Ge, In, Al, Mg, Zn, Cu, Ag, Cd, Pb, Sb, Tl or Bi, between the surface film and bulk Sn metal by means of analyzing the skimmed oxide from the pure molten metal tinwhich 0.005 at.-% each of the mentioned elements was added under 310℃. The results indicated that Ga, P, Ge, Mg, Zn, Al, In or As is enriched in the surface film, and its enrichment appears to be concerned with the higher heat of formation of relative oxide. The surface oxide film was detected by X-ray diffraction as complex oxy-acid salts of SnO and oxid eof enriched element. Because of an irreversible reaction, the surface structure could be remained till solidification. The XPS research on the solidified samples revealed that the only elements, e.g. Ga, Ge, As, Al and Zn are enriched within a very thin outer layer, about 2—3 nm thick, of the surface film, as a result of the modification and stabilization of its constitution and structure. Thus the liquid Sn may be protected free from further oxidation.
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Received: 18 March 1986
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| 1 Barin, I.; Knackc, O., Thermochemical Properties of Inorganic Substaces, Springer-Verlag, Berlin, 1973． |
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