Aryl Aminoalcohols as Corrosion Inhibitors for Carbon Steel in Chloride-Contaminated Simulated Concrete Pore Solution

摘要

In this paper, the rarely studied aryl aminoalcohols, namely comp. a-c were synthesized and then theircorrosion inhibitions for carbon steel in 0.3 M NaCl saturated Ca(OH)2 solutions were investigatedusing electrochemical techniques. The potentiodynamic polarization and electrochemical impedancespectroscopy tests showed comp. a and c had higher corrosion inhibition efficiencies than the mostcommonly used aminoalcohol type inhibitor N,N-dimethylaminoethanol (DMEA), but comp. b seemedno suppression of corrosion process. Based on the obtained results and previous work, we made a briefdiscussion on the inhibitive effectiveness related to the N-substituents of tested organic compounds.Besides, comp. a with the highest inhibition efficiency was further investigated, and it could act as ananodic inhibitor by a comprehensive interaction with the carbon steel surface according to theLangmuir adsorption isotherm. The surface morphology of the carbon steel observed by scanningelectron microscope showed a less amount of corrosion pits formed under inhibited conditions.