SIMONA CAPRARESCU, CRISTINA MODROGAN, VIOLETA PURCAR, ANNETTE MADELENE DANCILA, RADU CLAUDIU FIERASCU STUDY OF CORROSION EFFICIENCY OF MILD STEEL USING COMMERCIAL LIQUID ADDITIVES FOR FISH IN NATURAL WATER This work is devoted to examine the effectiveness of the different commercial liquid additives for fish (sweet corn and molasses) on corrosion of mild steel in natural water by different methods (gravimetric and potentiostatic polarization) at room temperature. The corrosion tests were employed to evaluate corrosion rate (CR) and inhibition efficiency (IE %). The maximum inhibition efficiency was obtained for the inhibitor type molasses of 90.00% by gravimetric method for a period of 3 hours and over 31 % by potentiostatic polarization method. It was found that the commercial liquid additives acted as a good inhibitors for the tested environment. Furthermore, the corroded metal was observed by metallographic microscope.