Electrochemical Oxidation Assessment and Interaction of 2-aminoethanol and N, N-diethylethanamine Propagation in Acidic Medium

Electro�oxidation and inhibitor performance of copper specimens in 1 M hydrochloric acid solu� tion was investigated at room temperature by linear potentiodynamic polarization and gravimetric method in the presence of 2�aminoethanol (A) and N, N�diethylethanamine (D) as an inorganic inhibitor. The effect of the inhibitory concentration on the corrosion behavior of copper was studied over 288 hrs at 298°K. The inhibitory efficiency rise up to 96% for single induced and 98% for synergistic behavior. The adsorption mechanism characteristic was supported by SEM/EDX analysis and adsorption isotherm. From all indica� tion, the inhibitive efficiency of these compounds majorly depends on their molecular structure and concen� tration. The blocking effects of the surface interface were also explained on the basis of the inhibitor active action. 2�aminoethanol and N, N�diethylethanamine inhibits copper in 1 M HCl by strictly affecting both the anodic and cathodic sites. Portion of the surface covered calculated was also found to follow Langmuir adsorption isotherm

The inhibition of the corrosion of pure iron in 0.5 M sulphuric acid by n-alkyl quaternary ammonium iodides

n-butyl, n-dodecyl and n-hexadecyl ammonium iodides were prepared and potentiostatic polarization studies showed that each quaternary ammonium salt inhibits the corrosion of pure iron in 0.5 M sulphuric acid at 30°C. The behaviour is similar to the corresponding bromides and the polarization curves indicate that the compounds behave as mixed inhibitors. Each compound exhibits Langmuirian behaviour and inhibition increases with increasing alkyl chain length. This is attributed to cohesive Van der Waals' forces between the positive head groups co-adsorbed with iodide ions on the positively charged iron surface