クロイワ List of Products and Services

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 generally eliminates the need for over-tapping, making it an effective quality improvement option compared to conventional thick film treatments. 【Features】 ■ Environmentally friendly ■ Super-thin film, high corrosion resistance, high weather resistance ■ Low-temperature processing ■ Hydrogen embrittlement-free

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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 specification conditions and propose the optimal surface treatment. We can accommodate requests starting from small sample production, so please feel free to consult with us.

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In comparison to existing black surface treatments, our proposed coating surface treatment can improve appearance quality and corrosion resistance. In the standard specification, a silver-based coating is applied with a black topcoat; however, 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 you are looking for black surface treatments.

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One property closely related to surface treatment is the coefficient of friction (slip resistance). Especially in the case of screw products, variations in the coefficient of friction during fastening can lead to insufficient tightening or over-torque, potentially resulting in various issues such as loosening of screws or indentation of the mating material. Our surface treatment not only improves rust resistance but also stabilizes 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.

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It 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 proposed as a replacement for stainless steel to iron materials.

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This is a composite surface treatment that combines alloy plating, alloy coating, and a topcoat to achieve 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.

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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 composed 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, allowing 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" allows for an extended retention of rust prevention capability.

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This is a high corrosion-resistant surface treatment system that combines a metallic zinc plating layer, a special chemical conversion coating layer, and a surface sintering layer. It features the advantages of a high-hardness coating from zinc plating and excellent edge coverage, along with high corrosion resistance and chemical resistance of the coating. 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 based on conventional zinc plating with a chromate layer, as well as completely chromium-free types. For stainless steel, it can provide high resistance to weaknesses such as chlorine and electrolytic corrosion.

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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) ranging from red rust for over 720 to 2,000 hours, enabling us to provide optimal proposals tailored to your needs. Additionally, because it contains lubricating components, it is also possible to adjust the friction coefficient, which can improve the accuracy of torque management for screws. We have a proven track record of adoption primarily among automotive manufacturers in Europe and the United States, as well as in various other fields. Please feel free to contact us for more details. Related link - http://kuroiwa-coating.com/product/

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"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 automotive 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.

• Rust Inhibitor

"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 is no concern about hydrogen embrittlement as 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.

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