クロイワ List of Products and Services

We offer the sale of products with high corrosion-resistant surface treatment applied in-house for metal materials such as flat bars and angles. In addition to simple rust prevention, we provide coatings with high chemical resistance and strong protection against galvanic corrosion. Please contact us for information on available sizes and other details.

• Steel

We offer blasting processing using tumbler and roller conveyor equipment. This provides effects such as cleaning metal parts, enhancing anchor effects as a pre-treatment for painting, and increasing the friction coefficient by roughening the surface.

• Processing Contract

By applying a top coat containing epoxy resin to the rough treatment, which is a super-thin film and high corrosion-resistant metal surface treatment, we further enhance scratch resistance and weather resistance. Both the base coat and top coat are super-thin films with good compatibility, which essentially eliminates the need for over-tapping, making it an effective quality improvement option compared to traditional thick film treatments. 【Features】 ■ Environmentally friendly ■ Super-thin film, high corrosion resistance, high weather resistance ■ Low-temperature treatment ■ Hydrogen embrittlement-free

• Surface treatment contract service
• Other Auto Parts
• Other machine elements

"LAFRE" is a metal surface treatment technology that achieves overwhelming corrosion resistance through a combination of three types of metal flakes and uniform film formation. With high coating hardness and excellent adhesion, it suppresses damage and loss of the coating during screw tightening and screw insertion. Additionally, there are no concerns about hydrogen embrittlement since there are no pickling or electrolysis processes involved. 【Features】 ■ Environmentally friendly ■ Ultra-thin film, high corrosion resistance ■ Low-temperature treatment ■ No hydrogen embrittlement ■ Coating properties *For more details, please download the PDF or feel free to contact us.

• Surface treatment contract service
• Other Auto Parts
• Other machine elements

This is a chrome-free coating with a rich metallic luster. By using high corrosion-resistant zinc flake paint or zinc plating as a base, it is possible to adjust corrosion resistance. With its glossy and sharp surface, it can also be suggested as a replacement for stainless steel to iron materials.

• Chemicals
• Surface treatment contract service
• Processing Contract

This is a high corrosion-resistant, completely chrome-free zinc aluminum flake surface treatment. In addition to a thin and uniform coating, the combination of a rich base coat and top coat allows for corrosion resistance in salt spray tests (SST) of over 720 to 2,000 hours, providing proposals tailored to your needs. Additionally, it contains lubricating components and has a stable friction coefficient, making it useful for improving the accuracy of torque management for screws. It has been adopted in various fields, primarily by automotive manufacturers in Europe and the United States. Please feel free to contact us for more details. Related link - http://kuroiwa-coating.com/product/

• Chemicals
• Surface treatment contract service
• Processing Contract

By changing the material of stainless steel products to iron and applying our high corrosion-resistant surface treatment, it is possible to achieve a total cost reduction. We will listen to your requirements for rust prevention performance and specifications, and propose the optimal surface treatment. We can accommodate small sample production, so please feel free to consult with us.

• Chemicals

In comparison to existing black surface treatments, our proposed coating-based surface treatment can improve appearance quality and corrosion resistance. In the standard specification, a silver-based coating is applied with a black topcoat, but if you want to further stabilize the black color, we can also offer options such as using a black base coat. Please feel free to consult us when looking for black surface treatments.

• Chemicals

One property that is closely related to surface treatment is the coefficient of friction (slip resistance). Particularly in screw products, variations in the coefficient of friction during fastening can lead to insufficient tightening or over-torque, resulting in various issues such as loosening of screws or indentation of the mating material. Our surface treatment can improve rust resistance while stabilizing within a specific range of coefficients of friction, enabling proper torque management. If you are experiencing issues with screw fastening or the coefficient of friction, please consult us. Additionally, if you are currently applying lubricants separately, our surface treatment can control the coefficient of friction on its own, making it possible to eliminate the use of lubricants. *Please note that the torque coefficient may vary depending on the conditions of the internal threads and the components being fastened.

• Chemicals

This is a high corrosion-resistant surface treatment system that combines a metal zinc plating layer, a special chemical conversion coating layer, and a surface sintering layer. It is a surface treatment that incorporates the advantages of the high hardness coating and edge coverage of zinc plating, as well as the high corrosion resistance and chemical resistance of the paint film. Additionally, it is possible to adjust the paint color to meet your requirements, allowing for discussions regarding color tone and gloss according to the intended use. It can also be used to add color to existing plating or zinc flake coatings. The treatment can be applied to various metals such as iron, stainless steel, and aluminum. For iron, there are types that use standard zinc plating and chromate layers as a base, as well as completely chromium-free types. For stainless steel, it is possible to impart high resistance against weaknesses such as chlorine and electrocorrosion.

• Chemicals
• Surface treatment contract service
• Processing Contract

The Disgo treatment is a completely chrome-free high corrosion-resistant treatment that combines a base coat containing zinc aluminum and a top coat primarily made of aluminum and organic resin (epoxy resin). Since there are no acid washing or electrolysis processes, there is no concern about delayed fracture due to hydrogen embrittlement, making it ideal for high-strength, high-carbon components. There is also a low-temperature treatment variation available, which allows for measures against changes in physical properties of the treated materials. Additionally, regarding the repair of coating scratches, using the always-dry repair paint "Draal" can further extend the rust prevention capability.

• Chemicals
• Surface treatment contract service
• Processing Contract

This is a composite surface treatment that combines alloy plating, alloy coating, and a top coat, achieving ultra-high corrosion resistance despite being a thin film. By applying this treatment to iron materials, it is possible to impart corrosion resistance equivalent to austenitic stainless steels such as SUS304. Additionally, it is resistant to damage from self-tapping screws and tools, and is effective against sulfurous gas and salt damage, demonstrating high corrosion resistance in various scenarios.

• Chemicals
• Surface treatment contract service
• Processing Contract

"DELTA" is a completely chrome-free rust prevention paint that contains no hexavalent or trivalent chromium. It maintains high rust prevention performance due to its very thin and uniform film, making it suitable for parts that require precise fitting, such as screws, bolts, and nuts. We have many years of experience and a proven track record, primarily with European automobile manufacturers. Please feel free to contact us. 【Features】 ■ Completely chrome-free ■ Maintains high rust prevention performance ■ Low drying temperature (around 200°C) ■ High permeability and elimination of liquid pooling ■ Suitable for parts that require precise fitting, such as screws, bolts, and nuts *For more details, please download the PDF or feel free to contact us. Regarding surface treatment lots, we can accommodate even small-scale prototypes, regardless of size. Additionally, if requested, we can handle parts procurement, surface treatment processing, and provide the finished product. Please feel free to consult with us.

• paint
• Rust Inhibitor