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Numerical modelling of corrosion - Theoretical backgrounds
During recent years research projects with different approaches have been carried out to develop models which are suitable to assess the metal removal rate in case of reinforcement corrosion. Some of them are based on empirical methods and correlate the corrosion rate to parameters like concrete resistivity, temperature and relative humidity. Another type of model is based on a quantification of the ongoing electrochemical processes. In this paper the theoretical backgrounds and mathematical descriptions of reinforcement corrosion with regard to a numerical modelling are presented and discussed. The mathematical formulations are capable to describe the galvanic corrosion process analytically. But the complexity of this formulation in practical cases leads to the conclusion, that a solution can only be found by numerical means, e.g. using the finite element or boundary element method. In this approach a specimen or structure is subdivided into small elements, whereas the electrochemical equations e.g. Ohms law and Laplace-equation for electrolyte, mathematical description of polarisation curves, are solved by approximation for every element. In case of finite elements it is thus necessary to discretisize the whole geometry, whereas boundary element programs demand only the discretisation of interface and surface areas. Both methods have their advantages and disadvantages, which will be introduced in a special article within this issue.
Numerical modelling of corrosion - Theoretical backgrounds
During recent years research projects with different approaches have been carried out to develop models which are suitable to assess the metal removal rate in case of reinforcement corrosion. Some of them are based on empirical methods and correlate the corrosion rate to parameters like concrete resistivity, temperature and relative humidity. Another type of model is based on a quantification of the ongoing electrochemical processes. In this paper the theoretical backgrounds and mathematical descriptions of reinforcement corrosion with regard to a numerical modelling are presented and discussed. The mathematical formulations are capable to describe the galvanic corrosion process analytically. But the complexity of this formulation in practical cases leads to the conclusion, that a solution can only be found by numerical means, e.g. using the finite element or boundary element method. In this approach a specimen or structure is subdivided into small elements, whereas the electrochemical equations e.g. Ohms law and Laplace-equation for electrolyte, mathematical description of polarisation curves, are solved by approximation for every element. In case of finite elements it is thus necessary to discretisize the whole geometry, whereas boundary element programs demand only the discretisation of interface and surface areas. Both methods have their advantages and disadvantages, which will be introduced in a special article within this issue.
Numerical modelling of corrosion - Theoretical backgrounds
Numerische Modellierung der Korrosion - theoretische Hintergründe
Warkus, J. (author) / Raupach, M. (author) / Gulikers, J. (author)
Materials and Corrosion ; 57 ; 614-617
2006
4 Seiten, 4 Bilder, 3 Quellen
Article (Journal)
English
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