Corrosion Inhibition Behavior of 1-Hydroxyethylidene-1, 1-Diphosphonic Acid on 20SiMn Steel in Simulated Concrete Pore Solution Containing Cl-
Received date: 2019-11-11
Revised date: 2020-01-04
Online published: 2020-01-22
Supported by
National Natural Science Foundation of China(U1867216);National Natural Science Foundation of China(51501201);National Natural Science Foundation of China(51801219)
The corrosion of steel rebar in concrete will be induced once the passive film is destroyed by chlorides or carbonation. Several techniques have been employed to reduce the corrosion so far. Among them, adding inhibitors is effective one because of its advantages, such as high efficiency and easy handling. 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP), a typical organic phosphonic acid, is a low toxic corrosion inhibitor for steel and iron in neutral aerobic environment. This compound was first used as scale inhibitor in water treatment industry, such as cooling water circulation system. The molecule of HEDP has two phosphate groups, making it a powerful chelating ability with metallic ions. However, most of the current studies of HEDP focus on neutral or near-neutral systems, and there are few reports on the corrosion inhibition of steel reinforcement in alkaline environment. Therefore, it is not clear whether HEDP can play the role of corrosion inhibitor by protecting the passive film and resist foreign corrosive Cl-. In this work, the inhibition effect of HEDP towards 20SiMn steel was investigated in simulated concrete pore solution contaminated by Cl- (Sat.Ca(OH)2+1 mol/L NaCl) by electrochemical methods (corrosion potential, potentiodynamic polarization curves, EIS and Mott-Schottcky curves) and surface analysis techniques (SEM, XPS). The results showed that HEDP was a mixed inhibitor and its inhibition efficiency increased first and then decreased with the increase of concentration, the optimal concentration is 1.441×10-4 mol/L . At the optimal concentration, HEDP could obviously enlarge the passive region, prolong the passive period of 20SiMn steel from 6 h to 9 h , and improve the charge-transfer resistance significantly with the inhibition efficiency around 46.45%~59.78%. When pitting corrosion occurs, HEDP could hinder its development with the inhibition efficiency over 93%. The inhibition mechanism was the preferential adsorption of HEDP over Cl- by forming a complete adsorption film outside the passive film of the steel.
Key words： HEDP; corrosion; corrosion inhibitor; adsorption; simulated concrete pore solution
Fengting CAO , Jie WEI , Junhua DONG , Wei KE , Tiegang WANG , Qixiang FAN . Corrosion Inhibition Behavior of 1-Hydroxyethylidene-1, 1-Diphosphonic Acid on 20SiMn Steel in Simulated Concrete Pore Solution Containing Cl-[J]. Acta Metall Sin, 2020 , 56(6) : 898 -908 . DOI: 10.11900/0412.1961.2019.00382
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