Stereoselective Synthesis and Corrosion Inhibition Behaviour of Allyldihydrocarveols on Steel in Molar Hydrochloric Acid

The addition of allylic Grignard reagents to dihydrocarvone gives rise to allyldihydrocarveol P1-P3. The reaction is completely stereoselective. Allyldihydrocarveols P1-P3 are tested as corrosion inhibitors of steel in 1M HCl using weight loss measurements. The results show that the addition of Allyldihydrocarveols decreases weakly the corrosion rate and increases the inhibition efficiency to reaches 77 %, 70% and 67% for P1, P2 and P3 at 3 g/L, respectively. The inhibitor adsorption process in mild steel/(P1-P3)/hydrochloric acid system was studied at different temperatures (313-333 K) by means of weight loss measurements. The adsorption of Allyldihydrocarveols P1-P3 on steel surface obeyed Langmuir's adsorption isotherm. The corresponding kinetic parameters were determined and discussed.