Modelization of stress distribution by dry sliding friction on cracked hard coatings

BUEZAS, F; M.B. ROSALES; TUCKART W.

Buenos Aires

Workshop; 2º INTERNATIONAL WORKSHOP OF TRIBOLOGY TRIBaires 2013; 2013

Chromium coatings are widely useful for industrial extreme applications due to improve hardness, wearability at high temperature of engineering tools and several components. However during chromium plating process, hydrogen is incorporated into the deposit forming chromium hydrides that are partially decomposed to metallic chromium and hydrogen gas. From this, the volume change and promotes microcracking. Typically, the microcracks show a preferential orientation perpendicular to the substrate and they are distributed throughout their depth, could not be related to any special feature of the substrate, and none of them communicate the surface with the substrate. As a observed by M. Gines et al [1], the crack density diminishes when the bath temperature increases. It is worth mention that microcracks density and distribution strongly depends on bath chemistry.