Effect of Iron Content in Brazing Filler Metals on Corrosion of Brazed Aluminum(Materials, Metallurgy & Weldability)

概要

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Immersion type corrosion tests in aqueous sodium chloride solution have been carried out on brazed aluminum and its alloys to clarify the effect of iron content in Al-10%Si system filler metals. Only 1100 base metal was influenced by the iron content of filler metals. The pit depths of 1100 base metal at brazed interface and bulk were increased with the increase of iron content of filler metals, however, the pit depths were almost constant in the range of 0.5〜1.4%Fe. The pit depths of the other base metals (99.99%Al and 3003) were immune to iron content of filler metals up to 1.4%Fe. The different effect of iron are attributable to the electrochemical characteristics of base metals. Base metals with lower electrode potential than filler metals and with large hysteresis in anodic polarization curves are suggested to be easily influenced by the iron content in filler metals.
大阪大学の論文