N,N-Diethylammonium O,O’-Di(3-methylphenyl)dithiophosphate as Corrosion Inhibitor for Q235 Steel in HCL Solution

Abstract

The corrosion inhibition of N,N-diethylammonium O,O-di (3-methylphenyl) dithio-phosphate (NDOMD) for Q235 steel in HCl solution was studied by electrochemical measurements and weight loss measurements. And the effects of temperature, HCl concentration and immersion time were also studied. Polarization curves indicate the NDOMD is a mixed-type inhibitor which anodic plays a leading role. The studies of weight loss measurement show that the inhibition efficiency was up to 94.46% at the NDOMD concentration of 100 mg·L-1 in 1.0 mol.L-1 HCl solution at 30°C. The adsorption of NDOMD on Q235 steel surface obeys the Langmuir isotherm.