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| EFFECT OF TRACE ADDITIVE ON ANTI-OXIDATION OF MOLTEN Sn-Pb EUTECTICS |
| ZHANG Qiyun; LIU Shuqi (Department of Chemistry; Peking University); LIU Dongqi; YING Liangehun (Belling Nonferrous Smeltery) (Manuscript received 4 October; 1983) |
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Cite this article:
ZHANG Qiyun; LIU Shuqi (Department of Chemistry; Peking University); LIU Dongqi; YING Liangehun (Belling Nonferrous Smeltery) (Manuscript received 4 October; 1983). EFFECT OF TRACE ADDITIVE ON ANTI-OXIDATION OF MOLTEN Sn-Pb EUTECTICS. Acta Metall Sin, 1984, 20(4): 296-302.
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Abstract The effect of individual additive at trace level of 25 select elements on the anti-oxidation susceptibility of the molten Sn-Pb eutectics has been scanned by the method of weighing the oxide films skimmed and collected fro mthe surface of molten alloys at 260±5℃. It was found that the elements in order of superlative susceptibility are Ga, Ge and P, and their best contents in wt-％ are 0.0008, 0.004 and 0.003 respectively. The anti-oxidation behaviour has been also examined by chemical analysis and X-ray powder diffraction as well as XPS technique for the study of surface layer of the alloy. Experiments indicated that the additive is highly enriched in the surface dense protective layer of 30-40 (A) thick, but for Ga up to 70-100 (A). The structure of the surface film is modified from porous into tenacious and compact one in the form of complex oxygen-containing acid salts of Sn with the oxide of enriched additive. The temperature dependence of antioxidation susceptibility is quite different, Ge and P additives no longer have any effect over 350℃, while alloy containing Ga is still stable even up to 400℃.
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Received: 18 April 1984
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