Comparison of the Tribological Properties of the Thermal Diffusion Zinc Coating to the Classic and Heat Treated Hot-Dip Zinc Coatings

Abstract

The presented studies are focused on the wear resistance and friction coefficient changes of the thermal diffusion (TD) zinc coating deposited on steel. The aim of research was to evaluate the variation in coating properties during dry friction as a result of the method of preparation of the basis metal. The measured properties were compared to those obtained after classic hot-dip (HD) zinc galvanizing—heat treated and untreated. Thermal diffusion zinc coatings were deposited in industrial conditions (according to EN ISO 17668:2016-04) on disc-shaped samples. The results obtained during the tribological tests (T11 pin-on-disc tester) were analysed on the basis of microscopic observations (with the use of optical and scanning microscopy), EDS (point and linear) analysis and microhardness measurements. The obtained results were similar to effects observed after heat treatment of HD zinc coating. The conducted analysis proved that the method of initial steel surface preparation results in changes in the coating’s hardness, friction coefficient and wear resistance.

The Comparative Analysis of the Coatings Deposited on the Automotive Parts by the Cataphoresis Method

“…The obtained results are compiled with the data on zinc coatings investigated in the previous authors’ experiments— Table 2 [ 48 , 54 , 55 , 56 ].…”

“…The measured friction coefficients are compared to values measured for different zinc coatings in Table 4 [ 48 , 54 ]. It is obvious that a properly prepared base surface (G1) provides a value of the friction coefficient at the level of the lowest value measured for the zinc coatings (lamellar).…”

“…Taking into account the above literature analysis, a similar cost of zinc and KTL coatings (depending on the time of protection and the size of the protected element [ 44 , 45 ]) and similar corrosion resistance of the compared coatings [ 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ], in this paper, the research on the impact of the base (steel) surface preparation on the properties of KTL coating was investigated. The results obtained were compared to those presented in the authors’ earlier studies on zinc coatings [ 46 , 47 , 48 ].…”

Characterization Of Zinc Coating By Sherardizing

“…A variety of ferrous materials can be treated, such as structural steel, heat-treatable steel or cast iron. In case of heat-treatable steel the sherardizing temperatures can be adjusted to the tempering temperatures of the heat treatment to prevent a significant change in properties [1][2][3][4][5][6][7]. The main benefits of a sherardizing layer are: uniform diffusion coating, low process temperature, hard and wear-resistant layer, good bonding between paints or polymers and substrate, no hydrogen embrittlement [1].…”

“…Sherardizing suits perfectly for small metal parts like springs, nails, screws, nuts and bolts, chain link. Especially for components used in aggressive salt water atmosphere sherardized parts are long-lasting and continue to function [5][6][7]. Within the scope of this study, the surface properties of sherardized steel plates due to different process times were examined and the coating thicknesses were examined by ED-XRF.…”