Abstract
Corrosion inhibition of low carbon steel, stainless steel types 316 and 304 in hydrochloric acid by potassium iodide was investigated at different temperatures using weight loss and polarization electrochemical techniques. Potassium iodide was found to be an excellent inhibitor for steel alloys with an efficiency reaching 97 % at 0.1 M of inhibitor concentration. Activation parameters were calculated using Arrhenius and transition state equations. The fraction of surface coverage calculated from corrosion rate data followed Langmuir adsorption isotherm by the formation of a monolayer on the metal surface. These results were confirmed by a kinetic–thermodynamic model. Activation and adsorption studies were fitted successfully to two mathematical equations: polynomial and exponential.
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