Novel zinc-based alloys used to improve the corrosion protection of metallic substrates

Abstract

The protection of metallic structural components against corrosion is fundamental to preserve their mechanical properties in aggressive environments. Zn-based coating represents one of the most used techniques to make protective coatings for metallic substrates. In the present paper, two types of novel zinc-based coating are proposed, by employing either a tin addition or an aluminium-tin-copper addition to the traditional zinc bath. The behaviour of steel-coated specimens under bending is experimentally and numerically investigated by considering different bath dipping times. A quite satisfactory agreement 2 between experimental and numerical results is observed, especially under plastic behaviour regime.

The influence of hot dip galvanizing process on intermetallic phases formation

“…In the recent studies, the demand of new Zn-based coatings leads to investigate many chemical compositions of Zn bath in order to generate different intermetallic phases, characterized by optimized mechanical behaviour. The mechanical behaviour of ipersandelin steel plate specimens, galvanized with two different types of improved zinc-based coatings, has been analysed in recent works, 4 and a mechanical model, able to predict the bending behaviour of galvanized plates starting from the composition of coatings in terms of intermetallic phases and their mechanical behaviour, has been suggested. The damage micromechanisms of intermetallic phases are observed in flat bent specimens, where radial cracks born in inner brittle phases and propagate toward the surface.…”

“…A wide investigation about the kinetics of coating formations must be performed in order to better understand the correlation between HDG process parameters and mechanical behaviour of coatings. The presence of intermetallic phases strongly influences the mechanical behaviour, as shown in the work of Vantadori et al For this reason, control of the coating phases composition is important for the optimization of mechanical properties. To the best knowledge to the authors, no many models are available in scientific literature that take into account the kinetics formation of intermetallic phases.…”

Numerical Simulation of Traditional and Technological Zinc‐Based Coatings: Part I

“…In the last years, there has been an increasing research on zinc coatings, in order to optimize the phases thickness and the mechanical and physical performances. [ 14–16 ] Such a research has to inevitably take into account the factors that influence the formation mechanics, and more precisely: [ 17 ] 1) the temperature and bath composition; 2) the dipping time; 3) the composition and the superficial state of the steel.…”

Testing the Mechanical Properties of High-Strength Zinc-Coated Bolts: FEM Approach

“…To conclude the discussion of zinc coatings, it should be noted that there are also methods in which other elements such as tin, aluminium, titanium, copper or lead are added to the galvanised coatings [18][19][20][21]. The above indicates that the issue of zinc-based coatings on steel materials is very challenging, still open and worthy of investigation.…”