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Investigations on black steel in high alkaline environment by means of electrochemical noise
Considering the critical corrosion inducing chloride content for steel in concrete, it becomes obvious that further research work is necessary to fully understand the chloride-induced corrosion of steel in concrete. Electrochemical noise measurements are well known to be very useful to investigate the early state of pitting corrosion. This paper discusses the capability of ENM (Electrochemical Noise Measurements) in terms of applications on steel in concrete with respect to pitting corrosion. S235 bright drawn steel bars to investigate the passive state and BST 500 S steel bars with mill scale to investigate the active state in solution as well as in concrete are used and the results particularly with regard to the conductivity of the electrolyt and the influence of porosity respectively are evaluated. The recorded data were current, current noise, potential and potential noise. Three different electrodes (SCE (saturated calomel laboratory reference), activated TIMO (titanium mesh) and Pt (platinum) wire)) for potential noise measurements were compared and evaluated with regard to the set noise. The tests were carried out in solution (de-ionized water, saturated with calcium hydroxide and with precipitation). Two different types of concrete, with fly ash and without, were used to obtain noticeable differences in conductivity. The results clearly show the general influence of resistance on the corrosion behavior of steel in concrete and give some indication that ENM is a capable method also for systems with comparatively high electrolyte resistances. It has to be stated that for investigations on unalloyed steel in high alkaline solutions the potential noise is not an adequate measure to gain knowledge about this corrosion system. It could be shown that ENM are applicable even on passive systems when considering current noise signals in the range of some 10-9 amperes. There are some indication that moisture content has a considerable influence on both the current and potential noise signals.
Investigations on black steel in high alkaline environment by means of electrochemical noise
Considering the critical corrosion inducing chloride content for steel in concrete, it becomes obvious that further research work is necessary to fully understand the chloride-induced corrosion of steel in concrete. Electrochemical noise measurements are well known to be very useful to investigate the early state of pitting corrosion. This paper discusses the capability of ENM (Electrochemical Noise Measurements) in terms of applications on steel in concrete with respect to pitting corrosion. S235 bright drawn steel bars to investigate the passive state and BST 500 S steel bars with mill scale to investigate the active state in solution as well as in concrete are used and the results particularly with regard to the conductivity of the electrolyt and the influence of porosity respectively are evaluated. The recorded data were current, current noise, potential and potential noise. Three different electrodes (SCE (saturated calomel laboratory reference), activated TIMO (titanium mesh) and Pt (platinum) wire)) for potential noise measurements were compared and evaluated with regard to the set noise. The tests were carried out in solution (de-ionized water, saturated with calcium hydroxide and with precipitation). Two different types of concrete, with fly ash and without, were used to obtain noticeable differences in conductivity. The results clearly show the general influence of resistance on the corrosion behavior of steel in concrete and give some indication that ENM is a capable method also for systems with comparatively high electrolyte resistances. It has to be stated that for investigations on unalloyed steel in high alkaline solutions the potential noise is not an adequate measure to gain knowledge about this corrosion system. It could be shown that ENM are applicable even on passive systems when considering current noise signals in the range of some 10-9 amperes. There are some indication that moisture content has a considerable influence on both the current and potential noise signals.
Investigations on black steel in high alkaline environment by means of electrochemical noise
Eichler, Thorsten (author)
2007
16 Seiten, 17 Bilder, 3 Tabellen, 26 Quellen
Conference paper
Storage medium
English
experimentelle Untersuchung , Tagungsbericht , unlegierter Stahl , Flugasche , Stahlbeton , Lochfraßkorrosion , alkalische Lösung , Calciumhydroxid , Impedanzspektrometrie , Mittelwert , Standardabweichung , Strommessung (elektrisch) , elektrochemisches Potenzial , Porosität , wässriger Elektrolyt , elektrische Leitfähigkeit , Rauschen , Rauschmessung , elektrochemisches Rauschen
Electrochemical noise measurements on unalloyed steel in chloride-containing alkaline environment
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Critical chloride content - Investigations of steel in alkaline chloride solutions
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