Search

The corrosion behavior of galvanized steels and zinc components under atmospheric exposure depends mostly on the corrosion product‐based cover layer formation under the prevailing conditions. The use of agar‐based gel electrolytes makes it possible to use electrochemical methods to obtain a characteristic value from these cover layers that describe their current and future protective capacity. It is shown here that different states of galvanized steel can be distinguished very well under laboratory conditions and that this method is also suitable for use under practical conditions. Based on the characteristic values and assuming future time of wetness, it is very easy to draw up a forecast for the future corrosion rate, which provides plausible values. [ABSTRACT FROM AUTHOR]

To check the reproducibility of electrochemical impedance spectroscopy (EIS) measurements, 19 laboratories have performed round-robin (RR) testing on EIS using various instruments and three different systems: a dummy cell and two electrochemical systems of practical interest in the nuclear corrosion domain. The general conclusion drawn from the tests performed with the dummy cell is that the actual commercially available instruments for EIS measurements are suitable to produce good quality data. Differences in the EIS diagrams for the tested electrochemical systems were observed and discussed. This RR exercise, involving for the first time a large number of laboratories, shows that intrinsic scatter (large or small) is present in the impedance data and that reproducibility should be readily checked. While EIS is an excellent technique for investigating the kinetics of electrochemical systems, great care has to be taken on planning and conducting the experiments. Recommendations are given to help obtaining reliable EIS results. [ABSTRACT FROM AUTHOR]

An introduction to the journal is presented in which the editors discuss various reports published within the issue which originated from the 6th workshop on electrochemical noise in the context of corrosion held in Magdeburg, Germany.

Electrochemical noise has made possible, with extreme sensibility the online record and analysis of spontaneous distancing of the equilibrium state of electrochemical reactions related to corrosion, increasing the possibilities for the investigation and monitoring of corrosion. Nevertheless, these possibilities opposing the traditional electrochemical methods can only be taken advantage of and optimized if many important considerations on the measurement devices, the correct planning of experimental procedures and the correct selection of suitable methods for analysis and interpretation of the signals are taken into account. [ABSTRACT FROM AUTHOR]