Zinc-nickel alloy is an alloy material composed of zinc and nickel mixed in a certain proportion. The addition of zinc-nickel alloy provides the following benefits in hot-dip galvanizing:
(1) Enhancing Corrosion Resistance and Adhesion of the Coating
The zinc-nickel alloy significantly improves the corrosion resistance of the coating due to its excellent corrosion-resistant properties. Both zinc and nickel are corrosion-resistant metals, and when they exist in alloy form, this corrosion resistance is further enhanced. The zinc-nickel alloy coating can more effectively prevent the substrate from being eroded by the external environment, thereby extending the product's lifespan. Additionally, the zinc-nickel alloy coating possesses good adhesion, firmly attaching to the substrate surface and being resistant to detachment.
(2) Inhibiting Excessive Coating Thickness and Poor Adhesion
During hot-dip galvanizing, especially for materials such as silicon-containing reactive steel, conventional galvanizing often results in issues such as excessive coating thickness and poor adhesion. The addition of zinc-nickel alloy can effectively inhibit these problems. A small amount of nickel added to the zinc bath can inhibit the rapid growth of the ζ-phase in the Fe-Zn alloy layer, making the alloy layer thinner and improving the coating's adhesion and appearance quality. For specific materials such as silicon-killed steel, the addition of zinc-nickel alloy can also eliminate the issue of excessive coating thickness caused by the Zinkernagel effect.
(3) Uniformly Improving Coating Performance
The zinc-nickel alloy coating can uniformly improve the coating's corrosion resistance, impact resistance, and surface stiffness, thereby increasing the workpiece's lifespan. Under harsh environments such as high temperatures and high pressures, the zinc-nickel alloy coating can maintain its excellent performance, ensuring product stability and reliability.
(4) Reducing Production Costs and Process Complexity
The use of zinc-nickel alloy can reduce production costs to a certain extent. Although the price of zinc-nickel alloy may be slightly higher than that of pure zinc, its excellent performance and longer lifespan can compensate for this cost difference. Additionally, the addition of zinc-nickel alloy does not significantly increase the difficulty and complexity of the process and equipment, making it easy to promote and apply in actual production.
(5) Enhancing Coating Uniformity and Aesthetics
The zinc-nickel alloy coating has a uniform appearance and good gloss, enhancing the product's aesthetics. In applications with high surface quality requirements, such as automotive exterior parts and architectural hardware, the zinc-nickel alloy coating can meet higher aesthetic demands.
