丸一興業 List of Products and Services

We apply coating adhesives such as melamine resin-based, acrylic resin-based, epoxy resin-based, polyester resin-based, and fluorocarbon resin-based (fluorine resin), etc.

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The plated surface is made of fine particles, making it very suitable as a base for painting and adhesion. When the material is immersed in anhydrous chromic acid solution, it becomes zinc-chromate plated. Immersing it in chromic acid solution dissolves the surface of the zinc plating, allowing the chromic solution to penetrate, resulting in a very fine surface that is likely to improve slip properties. Therefore, zinc plating may have poorer slip properties. If zinc plating is inadequate, another method is to immerse it in a 3% chromic acid solution. The 3% chromic acid treatment is used as a pretreatment for coatings that undergo very harsh processing such as pressing, bending, and cutting. (Automotive zinc-coated steel sheets undergo this chromic acid treatment.) The surface may not look much different from zinc plating to the naked eye, but similar to zinc-chromate plating, the rough zinc is dissolved by the chromic acid, resulting in a fine surface that is expected to improve slip properties. Additionally, the thin chromic acid film provides better corrosion resistance than zinc plating.

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