Corrosion inhibition on mild steel in 1.0 M HCl solution by 1-vinylimidazolium-3-methyltriphenyl phosphonium dihexafluoroantimonate salt

The effect of synthesized 1-vinylimidazolium-3-methyltriphenyl phosphonium dihexafluoroantimonate (vimtppf) on the corrosion inhibition of mild steel in 1.0m hcl solution was studied by weight loss measurements. the weight loss measurements were carried out on carbon steel specimens in 1.0m hcl and in 1.0m hcl containing various concentrations (5.0x10-4 to 5.0x10-7 m) of the laboratory synthesized vimtppf salt at temperatures ranging from 303 to 343 k.1-vinylimidazolium-3-methyltriphenyl phosphoniumdihexafluoroantimonate salt (vimtppf) was found to be a good efficient inhibitor for carbon steel in 1.0m hcl solution,reaching about 88 percent at the concentration of 5.0x10-4 m at 303k. the percentage of inhibition in the presence of this inhibitor decreased with the increase of temperature indicating that physical adsorption was the predominant inhibition mechanism since the quantity of adsorbed inhibitor decreased with increasing the temperature. this inhibitor could have industrial applications,where hydrochloric acid solutions at elevated temperatures are used to remove scale and salts from steel surfaces,such as acid cleaning of tankage and pipeline,and may render dismantling unnecessary.