Published: Jan 2005
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THE CHEMICAL PROCESS industry presents a complex set of materials selection challenges. Conducting corrosion testing of candidate materials under simulated or actual service conditions is widely used in the process of materials selection. ASTM G 4, Guide for Conducting Corrosion Tests in Field Applications and G 31, Practice for Laboratory Immersion Corrosion Testing of Metals, and NACE Standard TM-01-69, Laboratory Corrosion Testing of Metals are the general guides for conducting corrosion tests. While these standards can be very useful in making a preliminary list of the best candidate materials, they are designed primarily for the more common metals and alloys such as steel, aluminum alloys, and copper alloys. Certain portions of these procedures, e.g., cleaning methods, are not applicable to zirconium, hafnium, and their alloys. Although ASTM G 2 is designated specifically for zirconium, hafnium, and their alloys, it is a specific practice used in the nuclear industry. Therefore, a tailored practice for conducting corrosion specimen tests on zirconium, hafnium, and their alloys in chemical environments is needed. The use of test standards that have not been modified for zirconium or hafnium may lead to erroneous or invalid results.
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