The corrosion rate of binary iron–silicon alloys of 10, 16, 30 and 40wt-% Si, both annealed and as-cast, was studied at 20–100 mA.cm−2 in 1 M sulphuric acid and 1M NaCl, under galvanostatic conditions in the steady state.
Gas analysis (sulphuric acid) and gas analysis with solution analysis as well as weight loss (chloride solution) was used to determine the rate of anodic dissolution. Measurements of corrosion rate were also made using ‘retreat’ measurements made with a Talysurf Annealing appears to have little effect and the study shows that a progressive reduction in corrosion rate occurs from the 15% Si content commonly used in practice to the 40% upper limit investigated in this study.
