Abstract
Vaccum heated Al-Sn and Al-In alloy claddings as sacrifacial composites were tested. The Al-In alclad material heated in vacuum has an excellent cathodic protection effect in both the salt spray test and ASTM water immersion test. Pitting corrosion on the Al-Sn alclad material reaches to the 3003 core material in the salt spray test. This is caused by an over cathodic protection due to high galvanic current between the Al-Sn and 3003 alloy in the salt solution. The pitting depth on the Al-In alclad material is less than that on the Al-Sn alclad material in accordance with different diffusibilities of In and Sn to the core material. The alloys containing Sn and In which have low vapor pressure are superior in contamination protection in the vacuum brazing process to the alloy containing Zn which has high vapor pressure.
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