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| ACTION OF FLUX ON THE OXIDE FILM IN ALUMINIUM BRAZING |
| ZHANG Qiyun;LIU Shuqi;GUO Hai;JIAN Ai(Department of Chemistry;Peking University;Beijing |
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Cite this article:
ZHANG Qiyun;LIU Shuqi;GUO Hai;JIAN Ai(Department of Chemistry;Peking University;Beijing. ACTION OF FLUX ON THE OXIDE FILM IN ALUMINIUM BRAZING. Acta Metall Sin, 1985, 21(1): 129-152.
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Abstract A study was made on the mechanism of oxide film removal in Al brazing byobserving the microsctructures and scanning the conditions of fillet formation.Ex-periments show that the F-ion can only break the film to form openning windowswhich act as entrance for the permeation of flux.The heavy metal ions them-selves are incapable of breaking film,but act as surfactant gradually permeate intothe film beneath at the site of grain boundaries,and are finally precipitated there.The effective removal occurs only when both F~- and surfactant are present.Thefinal removal of the film results from the spreading of molten filler.The causeof detaching film from the substrate metal is the increase of valence of Al effectedby certain oxidant contained in flux and thus disintegrates the combination betweenthem.It is concluded that the flux sheer free from oxidant can not remove thefilm.
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Received: 18 January 1985
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