Elektrochemisches Rauschen bei der Korrosion

Abstract

Ausgehend von den Ursachen, den Quellen des elektrochemischen Rauschens, wird an mehreren Beispielen die gute Korrelation zwischen verschiedenen Systemparametern und den Rauscherscheinungen gezeigt. Bei Beachtung einiger Randbedingungen bieten sich sehr gute Möglichkeiten, das Rauschen für eine Art Frühwarnsystem bei der Anlagenüberwachung zu nutzen. Es wird aber auch gezeigt, dass das elektrochemische Rauschen, wie die Korrosion überhaupt, eine äußerst komplexe Erscheinung ist und dass das Nichtbeachten bestimmter Einflüsse und Parameter zu dramatischen Fehleinschätzungen führen kann.On the basis of the causes, the sources of the electrochemical noise, by several examples the good correlation between different system parameters and the noise behaviour is shown. With attention of some factors very good possibilities are offered of using the noise for a kind of an early warning system during the process monitoring. It is also shown, that electrochemical noise as well as the corrosion at all is of complex nature. Ignoring certain influences and parameters can lead to dramatic false estimates.

Corrosion effect on reinforced concrete with the addition of graphite powder and its evaluation on physical-electrochemical properties

“…Corrosion is considered as a process in equilibrium and with constant kinetics, while, in the case of electrochemical noise, imbalances in electrochemical reactions are recorded in very short time intervals (Goellner et. al., 2004).…”

Corrosion monitoring techniques for detection of crack initiation under simulated light water reactor conditions

“…While it is generally accepted6,10 – 12 that EN contains useful information about the electrochemical processes, there is no consensus about the best approach to extract the information. To some extent, this is because the best method varies according to the type of corrosion process being studied; however, it is also an area where further development is clearly required.…”

Detection of SCC initiation in austenitic stainless steel by electrochemical noise measurements

“…In technical systems such as light water reactor facilities the electrochemical noise (EN) measurement technique is one of the few promising corrosion monitoring tools for the early detection of SCC initiation [4][5][6], although no systematic investigations were performed so far in these high-temperature water environments. Most studies investigating the EN technique on its ability to detect SCC were performed in room temperature systems and had a rather 'spot check' character [7][8][9][10][11][12], nevertheless revealing very valuable and promising results.…”