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Corrosion in exhaust system

I'm a student in its, with major in mechanical-metallurgy. I'm starting experiment which relates to high-temperature corrosion. I have a question: in the exhaust system of a car which has filter or catalytic converter (copper), welded with muffler(steel). When the steel has oxidized, was it caused by a galvanic couple or from temperature of heat?

Yok Suprobo
student - Surabaya, East Java, Indonesia
2004

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