METHOD FOR EVALUATION OF RESISTANCE OF STEEL PRODUCTS AGAINST THE LOCAL CORROSION

摘要

1. A method of evaluating the resistance of steel products against local corrosion comprising the steps of that product was sampled, the samples are made with polished surface was treated for a predetermined time reagent is then carried out quantitative analysis of the active non-metallic inclusions, characterized in that the surface of the samples treated with a solution containing thiocyanate ions, and then carried out a quantitative analysis of affected and unaffected areas of corrosion by computer program processing functions grafiches their images, but the corrosion resistance of the products is judged by the proportion of damaged poverhnosti.2. A method according to claim 1, characterized in that the surface of the samples treated in solution 3-10% solution of thiocyanate ions for 3-5 hours at pH 8,0-9,0.3. A method according to claim 1, characterized in that a quantitative analysis of the affected areas of corrosion is carried out through computer functions "Contrast," and "Histogram" .4. A method according to claim 1, characterized in that the steel resistant against local corrosion are damaged surface proportion of less than 0.5%.