Modification of metallic surfaces using plasma treatments.

摘要

Various plasma techniques were used to modify the surfaces of selected ferrous and non-ferrous metals. The primary objective was to evaluate the possibility of using the plasma treatment to enhance surface properties such as corrosion resistance, contact conductance and nucleation deposition overpotential.;The results showed that plasma and thermal oxidation of titanium cathodes can strongly affect copper electrodeposition behavior. Below the transition temperature about 300;Metallic silver and copper and phase-mixed (Ag/C and Cu/C) transitional buffering interface coatings (TBI) were plasma deposited on aluminum 6061-T651 surfaces for thermal contact conductance improvement. Improvements noted depended on the contact surface, the coating materials and contact pressure. Greater enhancement was obtained from the specimens with turned surfaces and metallic coatings. The phase-mixed coatings exhibited lower thermal conductance but stronger adhesion and higher hardness.;Five different plasma surface treatments were applied to low carbon and tool steels. The effects of these treatments were evaluated in terms of corrosion resistance and hardness of the treated steel samples. It was found that the plasma deposited iron nitride was the most effective treatment for improving the corrosion resistance of the steels, and the nitride/carburization process produced the highest hardness.