EFFECT OF TRIALKYLSULFONIUM SALTS ON ELECTROCHEMICAL-BEHAVIOR OF IRON IN ACID CHLORIDE SOLUTIONS

The effect of trimethylsulfoniumperchlorate (TMSP), methyldibutylsulfoniumperchlorate (MDBSP), and methyldioctylsulfoniumperchlorate (MDOSP) on iron corrosion in acid chloride solutions was studied using potentiodynamic and capacitance techniques. The inhibition efficiency was shown to decrease in the order MDOSP > MDBSP > TMSP. The compounds behave as inhibitors mainly due to the structural changes in the double electrical layer caused by the adsorption of these compounds. The major factor is a change in the discharge conditions of activated complexes in the presence of surface-active substances (SAS) in the dense part of the double electrical layer.