The effects of coating conditions on the friction and corrosion resistance of carbon steel

Coatings are applied by using several methods to ensure low friction with high corrosion and wear resistance, particularly in gear applications. The friction and corrosion performance of black-phosphate-coated carbon steel at different temperatures and operating times were studied in this study. Moreover, comparison of the black phosphate coating and traditional manganese coating was conducted in terms of friction coefficient and corrosion resistance. The optimum temperature and time for black-phosphate-coated steels were 70°C and 20 min, respectively. The coating temperature showed a significant effect, whereas time displayed a minor effect on friction, but both of the results favor a lower energy cost. The average friction coefficient of black-phosphate-coated sample was calculated as half of the one obtained by manganese phosphate coating under the same coating conditions.