Laboratory and Engine Tests Confirm Reduced Wear with High-Speed Plating Technique: Hard chrome molybdenum (Cr/Cr-Mo) plating is a relatively inexpensive material to protect sliding surfaces of engine components, and it has low-friction and anti-wear characteristics. Considering the continued improvement in performance of future engines, operating conditions of sliding components are expected to become significantly more severe. However, the current chrome plating method is limited for achieving further improvements in friction and wear characteristics. Mazda engineers investigated a high-speed plating method as a potential production technique to break through the limits of tribological performance of Cr-Mo plating. Based on quality engineering, they investigated factors that control the plating process and material properties of Cr-Mo film plated on a sliding component. Control factors including the concentration of catalyst in the plating bath, electric current density, the bath temperature, and electrode distance were varied as test parameters to evaluate the effect on friction and wear characteristics. Although the application reported here is a rare rotary engine, the high-speed Cr-Mo plating technology may be of interest for improving tribological performance of engine components in general and for reducing cost. The chapter consists of 9 pages including 13 figures and 2 tables.