Wear-resistant Phosphate Coatings on Steel

Abstract

The possibility of precipitation of manganese-containing phosphate coatings of the required quality from a solution at a temperature of 75 °C. investigated. For this purpose, the previously obtained composition for the formation of manganese-containing phosphate coatings was modified, operating at a temperature of 95 °C. It was found that the developed composition at a temperature of 75 °C allows for 15 minutes of the process to obtain coatings of the required quality with a jurealite grain size of up to 10 microns, wear resistance and corrosion resistance properties. The effect of certain electrolyte additives on the mechanical, anticorrosive properties and structure of coatings was studied. A stabilized suspension of ultrafine diamonds with a particle size of up to 100 nm, graphite emulsion grade B1, and addition of PTFE particles grade PN-20 used as additives to the phosphating solution. It is shown that the introduction of all these additives into a modified phosphating solution leads to an improvement in the wear resistance of coatings. Fine crystalline phosphate layers formed from a solution containing PTFE particles detected in an amount of 0.5 g/l have the best wear resistance of the coatings. Recommended the coatings impregnated with oil with a corrosion inhibitor for products with threaded connections.