The study determines the effect of different surface preparation method of grade cast iron GJL-250 on the mechanical properties of the hot-dip zinc coating. The samples for testing were taken from the parts used in the construction of power overhead lines. Mechanical properties and wear intensity of the zinc coating was determined by tribological tests in conditions of dry friction, that were performed using a tester T-11. Study allowed for determination of the coefficient of friction of the zinc coating with dependence on the surface preparation method. In order to supplement the test results nanohardness on the cross-section of the applied coatings were measured. Measurements were carried out of the maximum load 20 mN using a diamond indenter type Berkovitch. Additionally, in order to determine the mechanisms of the coating damage macroscopic and microscopic analysis and measurements of surface texture were carried out. On the basis of the results studies, the differentiation in the degree of the coatings wear deposited after different method of surface preparation were evaluated. The research showed that the use of high-temperature oxidation as a way of surface preparation of the cast iron may decide on the tribological properties of the hot-dip zinc coating.Keywords: Cast iron, zinc coatings, surface wear, dry friction, oxidation
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