Friction behaviour of anodic oxide film on aluminum impregnated with molybdenum sulfide compounds

In order to improve the lubricity and wear resistance of aluminum anodic ox ide films, it is necessary to ensure the film layers are dense to prevent c racking, and to harden the films as well as reduce the shear stress of the film surfaces. From this view point, lubricious, hard anodic oxide films ha ve been studied in the past, but fully satisfactory results have yet to be realized. In this paper, we report on our study of the re-anodizing of anod ic oxide film in an aqueous solution of (NH)MoS. Molybdenum sulfide and com pounds filled the 20-nm diameter pores of the firm, creating internal stres s which compressed the film, suppressing the occurrence of cracks and reduc ing the friction coefficient. (C) 2000 Elsevier Science S.A. All rights res erved.