箔状ろう材に含まれるホウ素の挙動と希硫酸及び塩化ナトリウム水溶液中での耐食性

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  • Behavior of boron contained in foil brazing filler metal and corrosion resistance in dilute sulfuric acid and sodium chloride aqueous solutions

抄録

FP-613 is a powder brazing filler metal with excellent corrosion resistance. There is a market need for a foil type brazing filler metal with a composition equivalent to FP-613. To form a foil, boron must be added. Boron can create a chromium deficient layer and deteriorated corrosion resistance. We investigated the corrosion resistance of test pieces brazed using a foil brazing filler metal containing boron. Even when 0.5mass%B was added to the foil type brazing filler metal having the composition of FP-613, the corrosion resistance was not affected. Therefore, it was found that a foil brazing filler metal with the composition of FP-613 containing 0.5mass%B could be used. This allows us to supply brazing filler metal with good corrosion resistance in a new form.

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