Last Updated： Aggregation Period:Sep 17, 2025～Oct 14, 2025
This ranking is based on the number of page views on our site.
Last Updated： Aggregation Period:Sep 17, 2025～Oct 14, 2025
This ranking is based on the number of page views on our site.
Last Updated： Aggregation Period:Sep 17, 2025～Oct 14, 2025
This ranking is based on the number of page views on our site.
1～9 item / All 9 items
Black dyeing treatment can be applied to iron, brass, and stainless steel materials.
Black dye treatment can be applied to iron, brass, and stainless steel materials. By using copper plating or nickel strike plating in conjunction, black dye treatment can be applied to any material.
Forms a uniform thin anti-corrosion film! Since there is almost no dimensional change, it is suitable for high-precision parts.
"Black dyeing treatment" is a method that forms a black ferric oxide film on the surface of metals to prevent rust. It results in a black film with a metallic luster, giving it a beautiful appearance. A uniform thin rust-proof film is formed through chemical treatment, with a thickness of about 1μm, resulting in minimal dimensional changes, making it suitable for high-precision components such as precision machine parts, cutting tools, and other high-accuracy parts. Our company typically applies oil after black dyeing to protect the film. If you want to enhance the corrosion resistance of the black dye film, a "black dyeing + top coat" option is also available. 【Specifications】 ■Applicable materials: Iron, SUS ■Tank dimensions: H350×W450×D450 ■Processable size: H300×W350×D350 *For more details, please download the PDF or feel free to contact us.
【Troubleshooting】Black dye has turned brown or faded. We will explain the causes and countermeasures.
Black dyeing treatment is a surface treatment that reacts iron products in a high-temperature alkaline solution to form a black oxide film known as magnetite (Fe3O4). It has rust prevention effects and benefits such as anti-reflection and aesthetic enhancement. Black dyeing of general steel materials (raw materials) usually results in a deep black finish. However, for some materials, such as cast iron or those that have been hardened, as well as alloy steels that contain high amounts of chromium or other nickel, the result may be a reddish-black or a light gray instead of black. Additionally, wire-cut surfaces may appear brownish, resembling rust. The following causes can be considered: - Residual oil (insufficient degreasing) - Inadequate removal of the oxide film - High content of components other than iron in the material, leading to uneven reactions - Rough surface of the material, resulting in uneven reactions The following countermeasures can be taken: - Strengthening degreasing and cleaning - Removal of the oxide film through acid washing - Removal of thick oxide films and uniformity of surface roughness through sandblasting - Selection of black dyeing solutions suitable for alloy steels (such as SUS) Based on years of experience, our company selects black dyeing processes tailored to the material and processing history. If you have any concerns about black dyeing, please feel free to consult us.
![[Problem Solving Case] Stabilization of Quality in Black Surface Treatment](https://image.mono.ipros.com/public/product/image/d4f/2000610871/IPROS47913558325262027444.png?w=280&h=280)
Introducing a case where the variation in appearance between black-dyed lots has been improved, resulting in a more uniform black color.
We had outsourced the black dyeing process, but there were issues with variations in the shade of black depending on the lot, and at times, the appearance would turn reddish-brown and powdery. In response, Sun Industry has implemented strict management of the boiling point not in the line's tank, but using sample liquid drawn into beakers, ensuring it stays within a range of ±1℃ of the standard value. This has allowed us to prevent variations in dyeing between lots. By implementing this management, we have also been able to prevent the powdery appearance, and by performing surface treatment before the black dyeing process, we can achieve a more uniform shade of black. [Issues] ■ Variability in appearance between lots of black dyeing ■ Adherence of powdery foreign substances ● For more details, please visit our company website and contact us.
Our black dyeing service can accommodate everything from small lots to large items! We can dye up to 2 meters in length. We respond to requests regarding quality and delivery times! [Trial applications are currently being accepted!]
We offer processes such as black dyeing (iron oxide coating), Parkerizing (phosphate coating), barrel polishing, degreasing and cleaning, shot blasting, and press processing. Black dyeing (iron oxide coating) is mainly used for precision parts. Compared to plating and painting, it has lower rust prevention effects, but its characteristic is that it does not peel off. 【Applications】 ■ Automotive, machine parts, jigs, industrial equipment, springs, gears and shafts, machinery, precision parts, etc. 【Request Examples】 ■ I would like to request it for color identification. ■ I want to improve the adhesion between metal parts and rubber. ■ I would like to perform black dyeing processing on large items. 【Features】 ■ We can accommodate from small lots to large items! (Up to 2 meters possible! Please contact us first!) ■ Depending on the application, we can handle it in two patterns: bulk processing or small packaging! (Those with quality concerns are welcome!) 【Processing Examples】 ■ Processing materials: iron, steel, stainless steel ■ Machines used: Black dyeing 2800×600×400 (mm) set ■ Work size: Coating: approximately 1μm *Trial processing is also fine to start with! For more details, please refer to the PDF document or feel free to contact us.
![[Example] Introduction of Special Setup Items for Black Dyed Products](https://image.mono.ipros.com/public/product/image/681/2000704328/IPROS54033280438493062092.png?w=280&h=280)
Introducing examples of special setups for black-dyed items that cannot be processed using jigs, rod insertion, or garas!
For special setups of black-dyed products that cannot be processed with jigs, rods, or in a basket, there was an issue where the interior of the product created a bag-like hole, leading to liquid pooling and the formation of air pockets. In response, our company proposed improvement measures to address the liquid pooling and air pocket issues. For more details, please refer to the PDF download below. 【Case Study】 ■ Issues with Liquid Pooling - Liquid is carried into the next process, raising concerns about liquid defects. ■ Issues with Air Pockets - Air pockets occur during the degreasing and surface treatment processes. - Concerns about the dye not adhering properly. ■ Measures Against Liquid Pooling - Arranging products in a consistent direction to allow processing liquid to drain. - Tilting baskets at each stage to enable liquid drainage. ■ Measures Against Air Pockets - Fixing areas where processing does not occur by arranging products in a consistent direction. *For more details, please refer to the PDF document or feel free to contact us.
A method for generating a black film of Fe3O4 on the surface! Suitable for machine tools and the like.
The "black dyeing treatment," also known as "black iron oxide treatment" or "alkaline coloring treatment," involves immersing steel parts in a water solution primarily composed of concentrated caustic soda (NaOH) and boiling it (at 140-150°C) to generate a black Fe3O4 film on the surface. The Fe3O4 film is beautifully black and has better corrosion resistance the thicker it is, but it is generally a porous film about 1-2μ thick. It is used in many parts such as tools for machine tools, camera components, and gun muzzles. **Features of our black dyeing treatment:** - Customers are satisfied with the very beautiful black coloring, which enhances product value. - The degree of coloring varies depending on the material type and heat treatment condition. - Our company specializes in heat treatment, allowing us to understand the material type and heat treatment condition, and select the appropriate treatment method suitable for the material properties. - Once an order is placed, most customers become fixed customers. *For more details, please refer to the PDF document or feel free to contact us.*
You can achieve a beautiful black appearance! Processing that is perfectly suitable for precision machinery without damaging the surface of the workpiece at all.
Our website introduces the "Black Dyeing Process." Our product generates a film of magnetite (Fe3O4) on the surface by immersing it in a strongly alkaline solution. It provides a glossy and elegant black finish. The alkaline dyeing method achieves a beautiful black appearance without roughening the surface of the workpiece, and the finished product is almost equal in dimensions and weight to the original, making it suitable for precision machinery. Please take a look at our website. 【Features】 ■ Immersion in a strongly alkaline solution ■ Generation of a film of magnetite (Fe3O4) on the surface ■ Glossy and elegant black finish ■ Beautiful black appearance achieved through the alkaline dyeing method ■ The film does not peel off even when the workpiece is subjected to bending or impact *For more details, please refer to the PDF document or feel free to contact us.
[Troubleshooting] Black dye that easily turns red. Here are methods to improve corrosion resistance.
Black dyeing treatment is also referred to as "ferric oxide treatment." When iron products are reacted in a high-temperature alkaline solution, black iron oxide known as ferric oxide is produced. The black dyeing film has the property of gradually discoloring (oxidizing) to red over time as it reacts with water and oxygen in the air. The time it takes for discoloration to occur varies depending on the type of iron material, processing history, thickness of the black dyeing film, and storage conditions. To prevent discoloration of the black dyeing, it is important to constantly protect the surface with oil or similar substances and to avoid reactions with moisture in the air. Care should be taken during long-term storage as the oil may dry out. Our company adjusts the black dyeing treatment process according to the type of iron material. Additionally, while products are usually completed with an oil coating, if desired, a clear coat can be applied to further enhance corrosion resistance. Please feel free to consult us with any concerns regarding black dyeing.
