Silicate Enamels Forstainless Steels

摘要

For the development of enamels with different properties an experimental design was used in which the composition of different raw materials was varied. The enamels were applied on three stainless steel grades with a spray gun and fired at 820°C. Different pre-treatment methods (degreasing, pickling and blasting) for stainless steel sheets were used to find the method which leads to the best enamel adhesion on stainless steel. Blasting with corundum results in sufficient adhesion for all enamelled sheets. The analysis of statistical design shows the influence of the enamel raw materials on the different properties measured (e.g. chemical stability, coefficient of thermal expansion). The reasons for the limits of applicability of differently composed enamels on stainless steel substrates with defined coefficients of thermal expansion are discussed. Furthermore, colouring possibilities of direct-on enamels for stainless steel are mentioned.