Empirical or semi-empirical relations were develored to express the dependence of the possibility (probability) of localized corrosion attack of various stainless steels on environmental factors. Only chloride induced attack within range 0... 100°C (32...212°F) is considered. The enviromental variables considered include temperature, pH, chloride content, sulfate content, presence of oxidizing agents, crevices and deposits, flow rate and possibility of concentratic solution by evaporation. Common mathematical operations are used to formulate the trends into equations. Examples of the predictions of the model are given for type AISI 316 stainless steel in two environments: Baltic Sea water at 25°C and a solution containing 300 mg/l of chloride ions at 70°C.
Keywords: Corrosion, localized corrosion, pitting, crevice corrosion, modelling