Technical Overview
Characteristics of zinc-nickel diffusion layers
A zinc-iron alloy layer formed on the steel surface via reaction-diffusion.
The formation process of the diffusion layer: adsorption, absorption, and diffusion → formation and growth of a new phase → atomic diffusion
Metallographic examination of zinc-nickel diffusion layer
An alloy layer is formed on the steel substrate and achieves metallurgical bonding with the substrate. A diffusion layer with corrosion resistance is present.
Corrosion Protection Mechanism of Zinc-Nickel Diffusion Coatings
The diffusion layer consists of a surface deposition layer and a substrate diffusion layer. Its rust-prevention mechanism is based on the fact that the zinc-iron alloy layer has a lower electrode potential than the steel substrate, thereby providing electrochemical protection to the steel substrate.
The synergistic effect of zinc and nickel lowers the electrode potential of the surface diffusion layer, reduces the corrosion current, and slows down the consumption of the zinc-iron alloy layer.
The zinc-iron alloy layer and the diffusion layer together form a protective layer.
Protection performance: Up to 6,000 hours in the most severe neutral salt spray test.
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