Abstract

A main problem in the characterization of thermally sprayed layers is the detection of local defects such as cracks, irregularities in the pore size, and layer flaking. The corrosion resistance of coatings is often determined in the salt spray test, a time-consuming method which only provides qualitative results and results in the destruction of the samples. In this paper, a novel approach using a scanning electrochemical cell is investigated. Electrochemical, spatially resolved measurements are carried out on flame and vacuum plasma sprayed nickel-based coatings. A good agreement between the results of the novel measurement method and the observations from the salt spray test is observed. It is also observed that a quantitative analysis with the novel electrochemical method can be regarded as almost non-destructive and takes place in a short time, which enables a quick comparison between different coating systems. Paper includes a German-language abstract.

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