Abstract
Spray coating is a unique engineering coating technology. Molten materials spray on substrates to improve surface properties of various substrates. For instance, carbon steels are coated with Al, Ti, and Zn for better corrosion protection. Sprayed objects sometimes are heat-treated to improve the adhesion properties between the coated layer and substrate. Interfacial reactions of sprayed objects during heat treatment are examined in this study. The specimens include TS sample, Zn/steel, and diffusion couples, Zn/Fe-42wt%Ni and Sn-Zn/Fe-42wt%Ni. Alloy42 (Fe-42wt%Ni) is commonly used in the electronic industry. Sn-Zn alloys are promising lead-free solders. Knowledge of interfacial reactions of Sn-Zn/Fe-42wt%Ni is valuable for both thermal spray of Fe and Ni, and Sn-Zn soldering applications. Because the coating time is very short, for Zn/steel, very thin or no noticeable reaction layers are observed in the as-coated samples. With prolonged heat treatment, δ-phase is found.Γ-phase and Γ1’-phase are formed