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10117 Time Dependence of Chloride Induced Macro Cell Corrosion with Large Cathodes

Picture for 10117 Time Dependence of Chloride Induced Macro Cell Corrosion with Large Cathodes
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Product Number: 51300-10117-SG
ISBN: 10117 2010 CP
Author: Jörg Harnisch and Michael Raupach
Publication Date: 2010
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As part of the research group DFG-FOR 537 “Modelling of reinforcement corrosion”, the work described in this paper focuses on chloride induced macro cell formation of black steel in concrete with the main emphasis on time dependence.

As chloride induced corrosion at real structures is influenced by various time-dependent parameters, e.g. temperature and humidity, extensive laboratory tests on about 120 macro cell corrosion specimens are currently carried out. Following the working hypothesis based on Ohm´s Law, preliminary results concerning the time dependent behaviour of electrochemical parameters such as macro cell currents, calculated mass losses and driving voltages are presented. From these results the impact of the chosen testing parameters on the corrosion process can be clearly derived. Concerning the time dependent behaviour steady mass losses could be derived for the first 5 month of the test phase. No general time dependent trend concerning the driving voltages could be derived from the results obtained so far.

Keywords: time dependence, macro cell corrosion, steel, concrete, chlorides
As part of the research group DFG-FOR 537 “Modelling of reinforcement corrosion”, the work described in this paper focuses on chloride induced macro cell formation of black steel in concrete with the main emphasis on time dependence.

As chloride induced corrosion at real structures is influenced by various time-dependent parameters, e.g. temperature and humidity, extensive laboratory tests on about 120 macro cell corrosion specimens are currently carried out. Following the working hypothesis based on Ohm´s Law, preliminary results concerning the time dependent behaviour of electrochemical parameters such as macro cell currents, calculated mass losses and driving voltages are presented. From these results the impact of the chosen testing parameters on the corrosion process can be clearly derived. Concerning the time dependent behaviour steady mass losses could be derived for the first 5 month of the test phase. No general time dependent trend concerning the driving voltages could be derived from the results obtained so far.

Keywords: time dependence, macro cell corrosion, steel, concrete, chlorides
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