Comparison of Erosion Rates of SUS304 and SUS316 Stainless Steels by Molten Sn–3Ag–0.5Cu Solder
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概要
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An erosion test was conducted to compare the erosion rates of SUS304 and SUS316 stainless steels by molten Sn–3Ag–0.5Cu (mass%) lead-free solder. Stainless steels attached with polyvinyl chloride were used to accelerate the occurrence of erosion by destruction of the passivity of stainless steel and to shorten the incubation period of the occurrence of erosion. The average erosion rate of SUS304 steel is approximately 20% faster than that of SUS316 steel, whereas the maximum erosion depth evaluated by extreme value analysis does not depend on steel type. From microstructural observation of erosion interfaces, it was found that Fe–Cr–Sn and Fe–Cr–Mo–Sn layers form at the erosion interfaces of SUS304 and SUS316 steels, respectively.