日本電鍍工業 List of Products and Services

Plated parts can turn black over time. Have you ever experienced this? This phenomenon is common with silver and copper plating, and the cause may be sulfide formation. Sulfide formation is a chemical reaction where metals react with sulfur components to create metal sulfides. Examples: - Silver (Ag) → Silver sulfide (Ag₂S) → Blackening - Copper (Cu) → Copper sulfide (CuS, etc.) → Brown to black It gradually progresses through contact with sulfur compounds (H₂S, SO₂, etc.) in the air or surrounding materials. The causes include: - Sulfur gas in the air or polluted environments - Sulfur content in rubber, resin, adhesives, paper, and cardboard - Human sebum and high-temperature, high-humidity environments The impacts include: - Poor conductivity due to increased contact resistance - Decreased solderability - Appearance defects and reduced reliability Effective countermeasures include: - Sealed storage + use of desulfurizing agents and drying agents - Avoiding packaging materials that contain sulfur Sulfide formation can be prevented or delayed with proper management. [Nihon Denpaku Kogyo Co., Ltd.] 1-137 Nisshin-cho, Kita-ku, Saitama-shi, Saitama 331-0823 Tel: 048-665-8135 Fax: 048-665-8130

• Plating Equipment

Hello! This time, I would like to write about cleaning, which can be said to be the most important aspect of surface treatment. When it comes to cleaning, it is not simply a matter of removing oil! Depending on the base material, some may become rough when immersed in alkaline or acidic solutions, and the tendency to oxidize also varies. Since our company also performs electrolytic cleaning, the amount of electricity used varies depending on the conductivity of the product. The cleaning time also changes. If cleaning is not done properly, it can lead to poor adhesion of the plating, stains from the base material appearing in the finished product, or a rough and coarse surface finish. While the specific conditions we use are a trade secret, our company conducts the plating manufacturing process manually, allowing us to visually confirm the condition of the products after cleaning and adjust the cleaning process each time. I believe this is a factor that enables our company to work with a variety of customers across different industries. If you have any issues with plating, anodizing, electrophoretic painting, or other surface treatments, please feel free to consult us. [Supported Materials] Stainless steel, iron-based, copper-based, aluminum, titanium, silver, nickel silver, and others.

• Surface treatment contract service

We are pleased to announce that we have received the ✨'Chairman's Award of the National Federation of Small Business Associations'✨ at the 2023 National Plating Technology Competition in the "Electroless Nickel Plating Division." We are truly honored to be recognized for our ongoing efforts in technical improvement and quality enhancement. Our company is equipped to handle various plating processes, including electroless nickel plating, and we can flexibly respond to requests from prototype to mass production, and from single items to a wide variety. With our high technical capabilities and stable quality management, we strive to improve our skills every day. Please feel free to contact us with any inquiries regarding quality, delivery times, specifications, or technical challenges. We will continue to contribute to our customers' manufacturing through plating. ☺ We look forward to your inquiries! ☺ Address: 1-137 Nisshin-cho, Kita-ku, Saitama City, Saitama Prefecture, 331-0823 Phone: 048-665-8135 Fax: 048-665-8130

• others

What is anodizing? Typically, plating involves flowing positive electricity through the plating solution and negative electricity through the item. In contrast, anodizing flows negative electricity through the treatment solution and positive electricity through the item, forming an oxide film called "titanium oxide" on the surface of titanium. This is anodizing of titanium. What is the purpose? Anodizing allows the surface to be colored in various ways. It is widely used in medical devices, tableware, automotive and motorcycle parts, among others. Our company applies this treatment to medical items (such as bolts for bone fixation) and automotive and motorcycle components. Anodizing is used for decorative purposes, identification purposes, and to impart functionality. How does the color change? When the oxide film forms on the surface of titanium, the color changes depending on the thickness of the film. This color change occurs due to the "interference phenomenon of light." It is similar to the phenomenon where soap bubbles appear iridescent.

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In this case study collection, we present solutions to issues related to anodizing surface treatment technology. In anodizing surface treatment, which aims to improve the corrosion resistance and wear resistance of aluminum and add decorative and other functions: - Issues such as uneven appearance and coating cracks prevent the creation of beautiful anodized finishes. - We would like to request surface treatment and document preparation. - Concerns about handling scratches and appearance defects. If you have any of these concerns, please feel free to consult with us. [Published Solutions] ■ Achieving beautiful anodized finishes through treatment according to material! ■ For those seeking document preparation regarding product contents! ■ For those struggling with reducing handling scratches and appearance defects! *For more details, please refer to the PDF document or feel free to contact us.

• Surface treatment contract service
• Processing Contract

Nihon Denko Kogyo Co., Ltd. is a company that specializes in handling a wide variety of small-batch production. We propose and provide optimal specifications from the base layer to the finish, tailored to your applications and needs. 【Initiatives】 ■ All processes are done by hand: We are committed to creating products that satisfy those involved in the process of bringing a single item to completion and those who receive the finished products. ■ Reliable technical skills: We excel in producing a wide variety of small-batch items, from prototypes to large lots. With the technical skills we have cultivated over many years, we propose and provide optimal specifications. ■ In-house developed plating solutions: We possess over 50 types of "plating solutions," which are known to be difficult to manage due to changes in climate, and we provide high-quality surface treatments that combine functionality and aesthetics. ◎ For more details, please refer to the PDF or feel free to contact us.

• Surface treatment contract service

"Anodizing" is a treatment that creates an anodic oxide film on the surface of aluminum. It is possible to enhance the corrosion resistance and wear resistance of aluminum, as well as to add decorative and other functions. While the hardness of aluminum ranges from Hv20 to 150 (depending on the alloy), it can be improved to about Hv300 to 400 when subjected to hard anodizing treatment. 【Features】 ■ Corrosion resistance can be improved ■ Hardness can be increased to about Hv300 to 400 ■ Has insulating properties, so it does not conduct electricity ■ Used for heat dissipation treatments such as heat sinks ■ Can be colored in various colors *For more details, please refer to the PDF materials or feel free to contact us.

• Surface treatment contract service

Stainless steel is a metal that forms an oxide film and has the ability to resist corrosion such as rust. However, this oxide film hinders electrical conductivity, making direct gold plating on stainless steel difficult. Our company originally specialized in plating primarily for watches. With the technology cultivated through plating many stainless steel watches, we can remove the oxide film and perform direct gold plating appropriately. With the ability to perform direct gold plating, we can plate products without using nickel, which is a concern for those with metal allergies. This has garnered support not only from the watch and accessory industries but also from customers in the medical field, such as those producing catheters and stents that are inserted into the body.

• Other electronic parts

**What is Anionic Electrodeposition Coating?** By immersing the workpiece in the paint and applying direct current between the workpiece as the anode (+) and the electrode in the electrodeposition tank as the cathode (-), a coating film can be deposited on the workpiece. **Advantages of Anionic Electrodeposition Coating** 1. Color Coating is Possible In anionic electrodeposition coating, compared to cationic electrodeposition coating, the reduction in film thickness at the edge due to heat treatment is less, allowing for uniform film thickness and the possibility of aesthetically pleasing color coatings. Available colors: White, Black, Clear, Gold, etc. 2. Excellent Coating Performance - Coating Thickness: 5–10 μm - Pencil Hardness: 4H **Compatible Materials** - Iron materials - Stainless steel materials - Aluminum materials The image shows a stainless steel material polished to achieve a glossy finish, making it closer to gold plating. Additionally, products that require a glossy finish but cannot be polished can achieve gloss by applying a glossy nickel plating.

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Aluminum that has undergone anodizing develops numerous pores in the oxide film. Utilizing this characteristic, a natural coloring method is employed by adsorbing dyes into the pores. Plating can only produce colors based on the metal's hue. In anodizing dyeing, since the dye is used for coloring, it is possible to achieve various colors such as red and blue. 【Introduction to Anodizing Equipment】 - Soft anodizing (maximum size: 2000×700×1000) - Hard anodizing (maximum size: 2000×700×1000) - Glossy anodizing (maximum size: 600×500×900) - Matte anodizing (maximum size: 600×500×900)

• Other Auto Parts

Types of Silver Plating - Cyan-type Glossy Silver Plating - Matte Silver Plating - Glossy Pure Silver Plating [Characteristics of Silver Plating] - Glossy Silver Plating Mainly suitable for decorative items and electronic components, it achieves very high hardness and a mirror-like gloss. Vickers hardness: 180–210 Thick application possible - Matte Silver Plating Mainly used for electronic components, it is resistant to discoloration and can achieve electrical properties similar to pure silver. Purity 99.99% Hardness 70–80 Nup - Glossy Pure Silver Plating Purity 99.9% Hardness 80–160 Hv A glossy pure silver plating that does not contain metallic gloss agents (such as selenium or antimony). [Industries with Proven Results] - Decoration - Musical Instruments - Electronic Components - Medical - Others (Antibacterial Plating)

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**What is Cation Electrodeposition Coating?** By immersing the workpiece in the coating material and applying direct current between the workpiece as the cathode (−) and the electrode in the electrodeposition tank as the anode (+), a coating film can be deposited on the workpiece. **Advantages of Cation Electrodeposition Coating** 1. Improved Rust Resistance Cation electrodeposition coating can be applied uniformly, achieving high coverage. It can also withstand 350 to 750 hours in corrosion resistance tests (salt spray). 2. Environmental Adaptability It complies with the RoHS directive and REACH regulations. 3. Excellent Coating Performance - Coating Thickness: 15–30 μm - Pencil Hardness: 2H at 750g load - Water Resistance (Immersion): Over 250 hours **Compatible Materials** - Iron - Stainless Steel - Aluminum - Copper and Brass

• Other electronic parts

Our company can improve heat resistance by processing nickel plating and electroless nickel plating. With electroless nickel plating, it is possible to achieve heat resistance up to approximately 800°C. If you have any requests, such as wanting to enhance the heat resistance of your products, we would be grateful if you could consult with us.

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**What is Cation Electrodeposition Coating?** By immersing the workpiece in the coating solution and applying direct current between the workpiece as the cathode (−) and the electrode in the electrodeposition tank as the anode (+), a coating film can be deposited on the workpiece. **Advantages of Cation Electrodeposition Coating** 1. Improved Rust Resistance Cation electrodeposition coating can be applied uniformly, achieving high adhesion. It can withstand corrosion resistance tests (salt spray) for 350 to 750 hours. 2. Environmental Adaptability It complies with the RoHS directive and REACH regulations. 3. Excellent Coating Performance - Coating Thickness: 15–20 μm - Pencil Hardness: 2H at 750g load - Water Resistance (Immersion): Over 250 hours **Compatible Materials** - Iron materials - Stainless steel materials - Aluminum materials - Copper and brass materials

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**Properties of Titanium** Titanium is a metal known for its high strength, approximately twice that of iron and three times that of aluminum, and it also possesses the characteristics of being lightweight and flexible. Additionally, it has strong corrosion resistance and is said to be safe and chemically stable, making it less likely to cause metal allergies. Despite these characteristics, titanium continuously generates an oxide film in both air and water. This presents a disadvantage, as achieving good adhesion for coatings becomes very difficult when such a film is present. **Properties of Platinum Coating** Our company is capable of directly applying platinum coatings to titanium, and we have earned the trust of our customers regarding adhesion. Platinum coatings excel in oxidation resistance, corrosion resistance, heat resistance, and conductivity, and they are widely used for platinum electrodes due to their chemical stability. Furthermore, platinum itself is less likely to cause metal allergies, so it does not compromise the excellent properties of titanium. **Titanium Materials Suitable for Platinum Coating** - Pure Titanium - Titanium 64

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We also handle surface treatment for beauty-related items such as parts for beauty devices, jewelry, writing instruments, and Buddhist altar supplies. We cater to both corporate clients and individual customers. We add an extra shine to hobby projects like silver clay crafts.

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We also accommodate laboratory-level prototypes. In addition to surface treatment for difficult-to-plate materials, we also develop new plating solutions. Corrosion tests can also be conducted in conjunction.

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The origin of our company. Our thick plating technology and measures against metal allergies have been developed in response to the quality demands of watches. We continue to focus on plating, primarily for high-end watches.

• Other machine elements

For small quantities such as tests and prototypes. Unlike mass production factories, the types of base plating and combinations of film thickness can be freely customized. Please use according to your application.

• clutch
• Other Connectors

We also perform surface treatment on products that are related to life. With our direct gold plating technology for stainless steel, it is now possible to plate catheters and stents that enter the body (mass production achievements available). We accept testing and development research projects.

• others

It is said that the tone changes depending on the type of plating used for the instrument. Currently, we receive plating requests from all over the country, to the extent that it is referred to as "plating for musical instruments = Japan Electroplating."

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Nihon Denko Kogyo Co., Ltd. is a company that specializes in small-lot production, handling a wide variety of products. We propose and provide optimal specifications from the base layer to the finish according to applications and needs. The ability to handle important one-of-a-kind items, prototypes, and small-lot mass-produced products, which are difficult for large-scale production factories to manage, is due to our reliance on manual labor rather than machines. We also accommodate special plating such as partial and two-color plating, as well as build-up plating. 【Specialized Technologies】 ○ Thick Plating Gold, silver, and palladium-nickel plating can be applied up to 100μm thick. The finish is aesthetically pleasing, and other types of plating can also be applied thickly. ○ Metal Allergy Countermeasures and Environmental Regulation Compliance We offer plating specifications that do not contain nickel, which is a cause of metal allergies. Nickel-free gold and silver plating is possible on stainless steel materials. We also comply with regulations such as RoHS and REACH. ○ WET & DRY We can perform a combination of wet and dry plating, such as ion plating on the surface of the plating, in-house. For more details, please contact us or download our catalog.

• Surface treatment contract service