Arc spraying can be used to produce coatings to protect against wear and tear against erosion. This paper presents some results obtained within the core research program of the NRC Technology Group in Surface Engineering on the development of erosion-resistant coatings. A relationship is established between the volume loss of the material (performance) under different erosion conditions and the coating properties or the microstructure. The results show that the wear behavior of the arc-sprayed materials depends on the type, size and impact strength of the impacting eroding particles. It is observed that for soft materials, even if ductile tearing is an active mode of degradation, the brittle behavior of intersplat oxides also plays an important role. For harder materials, this brittle delamination of splats becomes the dominant erosive mechanism, as can be observed on the worn surfaces. Paper includes a German-language abstract.