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Electrochemical Injection of Corrosion Inhibitors and Chloride Extraction for Protection of Steel Reinforcement

Electrochemical chloride extraction from a reinforced concrete structure may be accompanied with an electrochemical injection of healing agents if such agents are positively charged and are able migrate towards the activated reinforcement. Positive charge carrying nanoparticles or cationic corrosion inhibitors might be the proper choice. Organic substances with a positive charge and their salts are mostly such inhibitors. Critical concentration of chlorides was investigated for fresh and carbonated concrete pore solution. Corrosion inhibition efficiency was evaluated by means of polarization resistance as a measure of corrosion rate. Sodium nitrite was taken as a reference corrosion inhibitor. Migration tests were performed in order to test the migration ability of promising cation corrosion inhibitors namely guanidine carbonate methylamine tetrabutylammonium bromide tetrabutylphosphonium bromide or triethylenetetraammine. Concentration profile of the inhibitors and chlorides was investigated in the testing concrete blocks. The best results have been obtained for guanidine carbonate and triethylenetetraammine. Both showed migration ability and reasonable corrosion inhibition efficiency. The migration characteristics of the cationic corrosion inhibitors were supplemented by numerical modelling.Acknowledgements: Financial support of the Czech Science Foundation (project 16-11879S) is gratefully acknowledged.

Product Number: 51319-13451-SG
Author: Milan Kouril
Publication Date: 2019
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