Study of the localised corrosion resistance of the 24.1 Cr22Ni7.1Mo superaustenitic stainless steel in mixtures containing chloride and chloride-fluoride ions

摘要

The localised corrosion resistance (pitting and crevice corrosion) of the high alloy 24.1 Cr22Ni/1.Mo superaustenitic stainless steel has been studied in solutions with chloride concentrations between 200 and 6.000 ppm. A similar study has been carried out using mixtures of equal concentrations of chloride and fluoride ions in the range of 400 to 12.000 ppm. PH values varied from 2 to 6.5. The critical temperatures for pitting and crevice corrosion have been calculated for these test media using electrochemical techniques (direct current).