The influence of heat treatment on selected physical properties of aluminized steel strips

The selected examinations of physical properties of the aluminised steel strips intended for elements of exhaust systems are characterized in the paper. Strips in their initial state and after the heat treatment, at temperatures from 250 to 700 °C for 30 to 1440 minutes, were investigated. The macro and microscopic observations of the surface of the coating before and after heating are presented. The most of attention was dedicated to investigations of the erosion resistance in a stream of solid particles, simulating the behaviour of the coating exposed to various kinds of fine-grained particles. The results are presented as the mass losses, changes of the coating thickness and observations of the effect of the abrasive-penetrating agent. Examinations of microhardness and microscopic observations at the cross-section of the coating were also performed.