Identification of corrosion products on nonferrous metal artifacts recovered from historic shipwrecks off the coast of Western Australia has provided conservators with useful information regarding the nature of the degradation processes on copper, brass, bronze, silver, lead, and pewter artifacts. Analysis of the different nature of the corrosion products produced under aerobic and anaerobic microenvironments can assist the conservator to determine the most appropriate treatment. The presence of corrosion products arising from minor alloying constituents provides a useful guide to the corrosion behavior of the parent metals.