ABSTRACT
Electrochemical techniques, potentiodynamic polarisation curves and electrochemical impedance spectroscopy are established techniques in corrosion science and, as such, are of particular interest for evaluating biomaterial–environment interactions. Electrochemical experiments were undertaken using a common experimental protocol. The choice of potentiostat, reference electrode, and geometry of the electrode set-up, as well as the nature of the auxiliary electrode to be used were left to the discretion of each laboratory. Global means and respective confidence intervals were calculated for each level and parameter for all of the laboratories before scrutinising the results for outliers, performed by numerical tests. The precision of an experimental method expresses the closeness of agreement between a series of measurements obtained from multiple sampling of the same, homogeneous sample. The precision may be considered at three levels: repeatability, intermediate precision and reproducibility. The reproducibility expresses its precision under the most diverse circumstances, including different laboratories, and thus has to be investigated in an inter-laboratory study.
