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A platform for research: civil engineering, architecture and urbanism
A study of organic substances as inhibitors for chloride-induced corrosion in concrete
Chloride-induced corrosion of carbon steel reinforcement is the most important cause of premature failure on reinforced concrete structures. Among available methods, corrosion inhibitors offer a simple and cost effective prevention technique, primarily to prevent and stop chloride-induced corrosion. Nevertheless, performance of commercial inhibitors is only partially satisfactory. This paper deals with a basic study on the inhibitive action of organic substances toward chloride-induced corrosion on carbon steel rebar in alkaline environment. More than 80 organic substances (amines and alkanolamines, carboxylate, aminoacids) were tested as candidate inhibitors for reinforcement corrosion in chlorides containing concrete. The effect of aminic and carboxylic groups was investigated through electrochemical potentiodynamic polarisation tests in simulating concrete pore solution in the presence of chlorides, to ascertain inhibitor effectiveness to increase pitting potential. Results are discussed taking into account the most likely mechanism of inhibition, in relation to the functional group of tested organic compounds. Carboxylate substances, especially poly-carboxylates, showed very good inhibition effectiveness, making them the most promising candidates among the tested substances.
A study of organic substances as inhibitors for chloride-induced corrosion in concrete
Chloride-induced corrosion of carbon steel reinforcement is the most important cause of premature failure on reinforced concrete structures. Among available methods, corrosion inhibitors offer a simple and cost effective prevention technique, primarily to prevent and stop chloride-induced corrosion. Nevertheless, performance of commercial inhibitors is only partially satisfactory. This paper deals with a basic study on the inhibitive action of organic substances toward chloride-induced corrosion on carbon steel rebar in alkaline environment. More than 80 organic substances (amines and alkanolamines, carboxylate, aminoacids) were tested as candidate inhibitors for reinforcement corrosion in chlorides containing concrete. The effect of aminic and carboxylic groups was investigated through electrochemical potentiodynamic polarisation tests in simulating concrete pore solution in the presence of chlorides, to ascertain inhibitor effectiveness to increase pitting potential. Results are discussed taking into account the most likely mechanism of inhibition, in relation to the functional group of tested organic compounds. Carboxylate substances, especially poly-carboxylates, showed very good inhibition effectiveness, making them the most promising candidates among the tested substances.
A study of organic substances as inhibitors for chloride-induced corrosion in concrete
Eine Studie über organische Substanzen als Inhibitoren für chloridinduzierte Korrosion in Beton
Ormellese, Marco (author) / Lazzari, Luciano (author) / Goidanich, Sara (author) / Fumagalli, Gabriele (author) / Brenna, Andrea (author)
Corrosion Science ; 51 ; 2959-2968
2009
10 Seiten, 21 Bilder, 5 Tabellen, 41 Quellen
Article (Journal)
English
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