Tribological behaviour of a continuous hot dip galvanized steel

Abstract

The aim of this work is to investigate the tribological behaviour of a continuous hot dip galvanizedsteel. This paper presents a fundamental study of the characteristics of zinc coating in terms ofmorphology, surface roughness and tribological behavior according to process parameters typical ofindustrial processes continuous galvanization. The morphology of the zinc coating was observed byscanning electron microscope (SEM), optical microscopy, and the mechanical properties of thecoating layers were determined by nanoindentation. The tribological tests were carried out on arotating ball-disk tribometer under loads of 1, 2, 3Nwith a sliding distance of 15, 30 and 50 m. Theresults showed a marked increase of the coefficient of friction with increasing applied load. Under thesame conditions, wear slightly increased due to the hardness of intermetallic phases. The resultspresented show that heating promotes the diffusion of iron in the zinc coating giving shape to a binaryalloy Fe-Zn whose characteristics depend on the parameters; moreover, it is proved that thetribological characteristics of the surface of the metal blank in terms of coefficient of friction dependon the temperature of the contact pressure.

Evaluation of mechanical and tribological behavior of galvanized, galvalume and polyurethane-coated steel sheets

“…The parts within the damaged areas of the coating depict the wear debris of the damaged layer during the scratch test, although within the acceptable ranges. The increase in surface degradation with an increase in load can be attributed to two main reasons: an increasing load can increase the pressure on the surface of contact between the substrate and the needle that enhances the degradation and secondly rise in temperature due to friction can cause an enhanced degradation of the coating [23].…”

“…In another study, Lopez et al studied the effect of ZrO 2 : SiO 2 ceramic nanoparticles for improving the properties of the polyurethane coatings to report enhanced corrosion resistance properties for them [10]. Papaj et al studied the effect of hardener variations on the protective properties of steel to report improved properties for the coatings at a particular hardener amount used, while Taleb et al studied the tribological aspects of galvanized steels [22,23]. However, studies performed on the mechanical and tribological aspects of the galvanized, galvalume and colour-coated steel sheets based on automotive applications are rare.…”

“…The coated steels have been extensively used in the automotive sectors (vehicle bodies, automotive underbody parts, door panels, automotive panels) and appliance industries for their excellent formability and corrosion resistance [23,24]. Colour-coated steel plays a crucial role in car dashboards and bumper cutters of cars and plays an essential role in the automotive industries [25].…”

Improving the Mechanical and Electrochemical Performance of Additively Manufactured 8620 Low Alloy Steel via Boriding

“…However, in terms of energy consumption and harsh chemical usage, this practice is particularly harmful to the environment. Apart from these fabrication issues, galvanized steel does not offer a significant improvement in wear performance and may result in lower hardness [13][14][15]. In this regard, boriding, a thermochemical process, can be used on steel to simultaneously produce better wear and fracture-and corrosion-resistant components [16].…”