The paper presents a comparative study of zinc coatings tribological properties in dry friction conditions in the context of assessing coating wear intensity. For this purpose, three zinc coatings were analyzed: hot-dip, galvanic and lamellar, put to steel bolts made of 23MnB4 steel normally applied in the automotive industry. The tests were conducted using a T-11 tester. As a result of tribological tests the friction coefficient of investigated coatings were determined. The investigations were supplemented by nano-hardness measurements using the Anton Paar NHT2 device. In addition, the microscopic analysis of the surface changes supplemented by surface texture measurements was conducted in order to clarify the destruction mechanisms. Based on the studies, the diversity of the tribological properties of the tested coatings was evaluated. Results achieved for steel samples were compared to the results that were determined in earlier studies for samples made of EN-GJL-250 grey cast iron. It has been shown that the tested coatings on both the steel and the cast iron have similar tribological properties, and the most wear resistant zinc coating is a lamella.Keywords: Tribological wear, friction coefficient, zinc, nano-hardness
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