Effect of roughness on the bond strength of decorative coating applied by cold gas-dynamic spraying

Abstract

Abstract The adhesion strength of joints obtained by cold gas-dynamic spraying (CGDS) on cast iron base has been investigated. It is known that corrosion resistance of CGDS coatings is largely determined not only by the nature of the sprayed material, but also by its adhesion properties. This paper is a method for predicting the adhesion strength of a protective and decorative coating, which is a useful tool for engineers when studying the effect of certain technological parameters on the adhesion strength of cold gas-dynamic spraying. The results of an experimental study of pretreated surfaces and powder materials are presented. The optimum heating temperature was determined and a choice of material and method of substrate processing which ensures maximum adhesion strength under given technological conditions was substantiated. It was shown that the temperature of heating of the product surface essentially influences the adhesion strength of the coating. Besides the quality of the preprocessed surface is one of the factors providing the coating adhesion strength to the substrate. The dependences of the influence of the temperature of heating of the sample and the roughness of the surface on the adhesion strength are presented. The use of cold gas-dynamic spraying as a method providing high strength properties of copper and zinc protective-decorative coatings is proved.