The thinning of tungsten carbide-cobalt hard metals to electron transparency by electropolishing

An electropolishing technique has been developed for thinning massive tungsten carbide-cobalt hard metals for transmission electron microscopy. The thinning was carried out in an electropolishing bath arrangement where the foil could be observed in a microscope. It has been possible to obtain foils suitable for determination of the microstructure and dislocation structure in tungsten carbide.