Corrosion testing of copper alloys and stainless steels is rarely ordered on new materials. Many assume that an alloy with a certain reputation should have an “expected” corrosion resistance, while that is rarely the case. ASTM specifications do not require corrosion testing and many manufacturers have focused on processing that lowers the manufacturing cost without the needed attention to corrosion performance. Often on tubular products, processing to maintain high corrosion resistance is more expensive. This paper identifies the manufacturing and chemistry changes for copper alloys and stainless steels over the last 30 years and the impact on resistance. It also suggests some tests that can be specified to ensure that you get what you expect for that alloy.

Author: Dan Janikowski

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