Corrosion of mild steel in elevated temperature hard freshwater

The bimodal model previously shown to be applicable to long term corrosion loss of mild steel in seawater is examined herein for hard freshwater at elevated temperatures. Laboratory data reported in the literature are reinterpreted using conventional corrosion theory and the bimodal model. The data fit the trends for the parameters of the model extrapolated from water temperature observations. One different set of data earlier can be reconciled if allowance is made for the effect on corrosion of water velocity. Overall the results show the bimodal model is applicable to freshwaters to 70°C.