Influence of surface treatment on corrosion resistance of steel in liquid Pb

This work deals with behaviour of steel in liquid lead environment and possibilities of corrosion resistance improvement. Liquid metal cooled systems are under wide investigation and development and represent a good alternative. It is necessary to find materials, which would be affected by liquid lead minimally. Austenitic steel 316L without coating and coated with TiSiC was studied in flowing liquid lead. Conditions of the experiment simulated real environment of the system. Deposition of protective barrier reduced the metals dissolution and diffusion of liquid lead into the steel substrate, degradation of substrate due to high temperature and mechanical stress. Presence of Si in the layer increased the surface ability to form stabile oxide and contribute to steel´s protection

Zn-PTFE composite coating – an alternative for functional coatings

This article covers the characterization of newly developed zinc based composite coating with incorporated polytetrafluorethylene particles (Zn-PTFE coating). Coatings prepared under selected optimal parameters were studied with regard to their composition by microscopic analysis, infrared spectroscopy and X-ray photoelectron spectroscopy and with regard to their function by tribological experiments and corrosion tests. Analytical methods enabled to evaluate the presence of PTFE particles in the coatings and also the homogeneity of the particles distribution. Tribological experiment confirmed a positive effect of PTFE on friction properties of Zn-PTFE coatings. Corrosion tests demonstrated that the addition of PTFE did not decrease the corrosion resistance of Zn-PTFE coatings. Due to their corrosion resistance and self-lubricating properties, Zn-PTFE coatings offer promising alternative to currently used functional coatings