Inexpensive zinc plating (chromate treatment) that can provide corrosion resistance.
Zinc plating is an indispensable presence when it comes to plating. The zinc coating is a bluish-silver metal that has a glossy appearance and exhibits paramagnetism, and the choice of zinc plating suitable for the material can affect its corrosion resistance. Zinc plating can be achieved through two methods: one is to deposit zinc metal using electric power, and the other is to immerse the material in molten zinc, both of which provide a plating treatment that imparts high corrosion resistance. Zinc plating has a high rust prevention effect and is mainly applied to iron products, as an inert film is formed on the zinc plating. Since zinc has a greater tendency to ionize than iron, even if there are pinholes in the plating film, zinc acts sacrificially to prevent rust on the base material, achieving a high level of corrosion protection. This is known as sacrificial protection.
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basic information
The characteristics are as follows: 1. Conductivity as an electrical property The conductivity of zinc metal is good at 5.9×10^-6 Ω-cm, and it increases further with chromate treatment. 2. Workability With a Mohs hardness of 2.5, it is brittle at room temperature, which poses some issues for bending after plating, but it is generally good. 3. Brittleness After zinc plating, if treated at 200°C for several hours within 4 hours, hydrogen is released, eliminating brittleness and making it suitable for use in car bolts and similar applications. 4. Solderability It can be used without issues in its zinc state. 5. Corrosion resistance Zinc plating alone can lead to white rust, so chromate treatment compensates for this and provides corrosion resistance. 6. Protective effect of the coating The oxide film of zinc is less permeable to air and water, and to enhance the corrosion resistance of zinc plating applied to iron products, chromate treatment is performed. 7. Sacrificial corrosion protection Zinc has a greater tendency to ionize than iron, making it less prone to rust. 8. Even with pinholes in the coating, the rust prevention effect on steel products is significant Zinc acts sacrificially, causing the zinc around scratches to dissolve before the iron, providing electrical protection.
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Applications/Examples of results
- Automotive parts - Motorcycle parts - Industrial machinery parts - Outdoor products
Company information
We perform plating processing on components used in various industries, including semiconductor parts, satellite parts, ship parts, and food-related components. Our strength lies in our high technical skills, which are a result of our thorough quality management system! We often receive comments from customers such as, "The quality of Sanwa Plating Industry is very trustworthy." We aspire to be a company that contributes to solving the challenges of businesses across Japan by leveraging the technology we possess. Additionally, as a company philosophy, we value the idea of considering the entire company as one family.
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