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The article presents the results of an experimental study of the corrosion resistance of the ta-C double coating of parts by PVD method with intermediate and final surface polishing with a discrete tool. The influence of regime factors on the results of polishing the ta-C coating with a discrete tool is shown, and optimal processing modes are proposed. Tests of samples in a salt bath showed that the double ta-C coating by PVD method with intermediate and final polishing ensures the absence of corrosion and coating peeling

The paper reports the description of tests on electro-chemical removal of hard anti-friction coating from a metal part surface. As an electrolyte there was used a solution of nitric acid. To carry out investigations there was used an incomplete three-factor experiment at two levels. It is defined that the highest impact upon a degree of coating removal is made by treatment time. The concentration of a nitric acid solution and a voltage value influence has a much smaller impact.

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The results of the experimental investigation of polycrystalline diamond coating polishing in parts by a metal brush are shown. A polishing mode impact upon roughness of the surface obtained is shown. The analysis of results obtained is carried out.