Corrosion resistance of carbon steel under an aerobic acidic condition in the presence of borate as corrosion inhibitor
2019
Purpose
A high-boron concentration solution is commonly used as a buffer system in the study of metal corrosion. However, it is impossible to apply such a high-boron concentration solution in the practical use because of the high-cost and environment problem.
Design/methodology/approach
In this study, the authors examined the effect of a low dosage of boric acid and borax mixture as inhibitor to suppress carbon steel corrosion in 1 M HCl solution by weight loss experiment and various electrochemistry methods (potentiodynamic polarization curves, electrochemical impedance spectra and electrochemical noise).
Findings
Results showed that the borate mixture exhibited an anodic-type inhibitor characteristic, when the total boron concentration was in the range of 100∼150 mg L−1. The passivation performance derived from the formation of a passive film with and FeBO3-FeOOH structure, whose integrity and thickness gradually increased with the increasing boron concentration.
Originality/value
Low boron solution could protect carbon steel from the attraction of corrosive ions by forming a passive film with Fe-O-B structure. The findings broaden the application range of borate solution in the industry.
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