Corrosion of Co-Cr alloys in aqueous environments

The literature relating to the corrosion in aqueous media of the Co-Cr alloys is reviewed. Data are surveyed for their corrosion in sulphuric acid, alkalis and in hydrochloric acid and chloride media. In the latter category, the information is sub-divided into single corrosion, crevice and stress corrosion, fretting corrosion and data obtained from 'in vivo' experiments. It is clear that the very low current densities which result from 'in vitro' experiments present abnormal experimental problems and may not, in every case, actually represent the dissolution process.