ユミコアジャパン List of Products and Services

AURUNA 5750 is a plating solution of approximately 12 carats of gold-silver alloy (50% gold / 50% silver). The resulting film exhibits a pale yellow color. It demonstrates high corrosion resistance and excellent ductility, resulting in high durability. Even when finishing with high-purity gold plating, it is possible to reduce gold usage by employing AURUNA 5750 as an intermediate layer. The stability of the bath is high, and it is resistant to the contamination of inorganic impurities. It is compatible with both rack plating and barrel plating.

• Non-ferrous metals
• Chemicals

The plating film is an alloy of 20% rhodium and 80% platinum. It offers the significant advantage of cost reduction compared to pure rhodium. While keeping the total precious metal concentration in the plating solution to 1g/L, a stable quality plating film can be obtained. Economic rhodium plating can be started from 1L. Another major feature is that the bath operation and plating process are simple, making bath management easy.

• Rare metals
• Chemicals
• alloy

DIALLOY 822 is an alkaline cyanide-type tin-zinc alloy plating solution. It can be applied to barrel plating and rack plating. The alloy composition is 80% tin and 20% zinc under standard conditions, but the alloy composition can be adjusted by changing the working conditions. The plating film obtained with DIALLOY 822 is ideal for functional parts. It imparts corrosion resistance to iron and iron alloys and contributes to wear prevention with good sliding properties. By adding post-treatments such as passivation and sealing, corrosion resistance can be further enhanced. The plating film exhibits excellent solder wetting and weldability.

• Non-ferrous metals
• alloy
• Chemicals

This catalog is a comprehensive catalog featuring precious metal plating chemicals handled by Yumiko A Japan Co., Ltd. We offer a wide range of products including gold plating solutions, functional surface treatment gold plating connectors, bonding gold, decorative plating color gold, and more. [Contents (excerpt)] ■ Gold plating solutions ■ Functional surface treatment gold plating connectors ■ Functional surface treatment bonding gold ■ Decorative plating color gold ■ Silver, etc.

• Non-ferrous metals
• alloy
• Rare metals

In wearable and mobile devices, charging speed and durability are important performance factors. However, gold-plated connectors can corrode when current flows while in contact with water or sweat containing minerals. To meet the high demands of the market, Yumicore proposes PLATUNA N 1. PLATUNA N 1 is a pure gold plating solution that produces a high-gloss, white appearance coating. The coating has excellent electrical properties, high wear resistance, and outstanding corrosion resistance.

• Other metal materials
• Chemicals

Silver-palladium alloy plating ARGUNA-ALLOY 1 was developed to withstand high-temperature environments. To maintain a low friction coefficient and high hardness, this alloy plating is suitable for the outermost layer of electrical contacts such as connectors. This plating process demonstrates its advantages as a surface treatment for electric vehicles, where various specifications are required under high-temperature conditions.

• Non-ferrous metals
• Chemicals
• alloy

The graphite composite silver plating solution ARGUNA C-100 was developed for terminals (fast charging terminals) that require high voltage resistance. The resulting coating has excellent electrical properties while eliminating the limitations of the lifespan of charging terminals. Graphite particles are uniformly incorporated within the silver coating, serving as a lubricant. As a result, it significantly reduces wear during insertion and removal, providing high reliability and durability. It withstands over 50,000 insertions and can always demonstrate optimal charging characteristics, taking charging terminals to a new level. For more detailed information, please check the webinar at the URL below.

• Non-ferrous metals
• Chemicals

ARGUNA 629 produces a high-gloss, silver-white coating. It is suitable for both functional and decorative applications and can be plated at high working temperatures. The plating solution has high transparency, and the wide operating range makes bath management easy. Silver strike plating is not required for nickel coatings. It can be applied to rack plating and barrel plating.

• Non-ferrous metals
• Chemicals

This is a hard silver plating process using alkaline cyanide bath. It is particularly suitable for electromechanical components subjected to high mechanical loads. The wear resistance has been improved by adding a new additive. High coating hardness and wear resistance enhance the fitting cycle. Even after thermal history, stable high hardness can be achieved.

• Chemicals
• alloy
• Other metal materials

ARGUNA 635 is a glossy silver plating solution that can be used for both functional parts and decorative items. It meets the requirements of ASTMB700 type B and provides a high-purity silver coating with a maximum hardness of 190HV. The resulting coating exhibits superior wear resistance and vibration resistance compared to pure silver. By adjusting the working conditions, barrel, rack, and continuous plating are possible. The coating has excellent electrical properties and demonstrates stable hardness over a long period.

• Non-ferrous metals
• Chemicals

This is an alkaline non-cyanide silver plating solution for functional parts. Since the plating solution contains no harmful cyanide compounds at all, it can reduce the burden of increasing environmental regulations and safety standards in recent years. The resulting coating demonstrates excellent wear resistance, making it suitable for electrical contacts subjected to high mechanical loads. Its excellent heat resistance contributes to improved reliability and longevity of electrical contacts.

• Non-ferrous metals
• Chemicals

This is an alkaline non-cyanide pure silver plating solution for functional components. It is also suitable for decorative applications. Since the plating solution contains no harmful cyanide compounds at all, it can reduce the burden of increasing environmental regulations and safety standards in recent years. There is a growing demand for non-cyanide processes, especially in the medical field. It is suitable for applications that require excellent solderability and wire bonding properties. Similarly, it is also suitable for electrical contacts that involve large currents, starting with power electronics.

• Chemicals
• Non-ferrous metals

AURUNA 311 allows for direct, highly adhesive gold plating on stainless steel for functional parts. Due to the very high activation effect of the plating bath, it is suitable for difficult-to-plate materials that are hard to activate, particularly chromium-nickel-molybdenum steel or nickel alloys. It has few pinholes, high ductility, and excellent corrosion resistance. It is suitable for both strike plating and thick plating.

• Non-ferrous metals
• Chemicals

AURUNA 500LC is a neutral plating solution of an 18-carat gold-copper alloy that produces a red, glossy plated film. By keeping the gold concentration in the plating solution low, it is economical. It is mainly suitable for decorative applications such as jewelry and accessories. The film is hard and has excellent wear resistance. The plated film achieves gold reduction while having high discoloration resistance and corrosion resistance.

• Non-ferrous metals
• Chemicals

In wearable and mobile devices, the required performance is becoming increasingly demanding, including durability and fast charging. The performance required for charging terminals and connectors (such as USB-C and pogo pins) cannot be met by conventional gold plating. When gold-plated terminals come into contact with seawater, pool water, sweat, or beverages during charging, corrosion occurs. By plating the contact terminals with RHODUNA-ALLOY 1, high resistance to corrosion can be achieved. This plating film is also compatible with fast charging of devices.

• Rare metals
• Chemicals
• alloy

Rhodium gives decorative items a high-gloss white appearance. Platinum has an immutable value and provides high reliability. By combining these two precious metals, we have developed a highly attractive alloy plating solution. The coating of RHODUNA PT is typically composed of 50% rhodium and 50% platinum. RHODUNA PT is easily recognized by the jewelry industry due to platinum's high social value, while also enjoying significant cost reductions compared to pure rhodium.

• Rare metals
• alloy
• Chemicals

PLATUNA PT is a strongly acidic platinum plating solution. It reduces the risk of damaging materials due to its lower sulfuric acid concentration. It demonstrates excellent uniform electrodeposition properties, maintaining a consistent plating speed across a wide range of current densities. The stability of the chemicals has been significantly improved compared to conventional products. PLATUNA PT showcases its advantages as a process for various functional components. It achieves a uniform platinum film thickness, and its application as a hydrogen generation catalyst for the cathode of water electrolysis devices is anticipated. Platinum is biocompatible, highly corrosion-resistant, and has excellent electrical conductivity, making it suitable for medical electrodes. In electrical contacts such as connectors, platinum plays a role in reducing contact resistance while enhancing corrosion resistance and wear resistance.

• Non-ferrous metals
• Chemicals

The new palladium-nickel plating PALLUNA ACF-100 maintains the characteristics of conventional plating films while being free of ammonia and chlorine. As a result, it is odor-free and reduces corrosion of plating equipment and anodes. The plating film has high ductility, is crack-free, and exhibits excellent wear resistance. PALLUNA ACF-100 is a high-speed plating process, and the plating appearance is glossy.

• Rare metals
• Chemicals
• alloy

Conventional palladium plating solutions have caused ammonia odors, which have been a burden for workers. PALLUNA ACF-800 contains no ammonia at all, contributing to an improved working environment. Furthermore, since it does not contain chlorine, which has strong corrosive properties, the lifespan of insoluble electrodes and plating equipment is significantly improved. The coating has high ductility, is crack-free, and exhibits excellent corrosion resistance.

• Non-ferrous metals
• Chemicals

Metals belonging to the platinum group have trends that vary by era. The reasonably priced and stable platinum group metals have made significant advancements in both undercoating and finishing. Yumico's ruthenium plating solution (RUTHUNA) has excellent features and is attracting attention as an alternative to palladium plating due to its ability to significantly reduce costs compared to palladium.

• Non-ferrous metals
• Chemicals

Indium 9100 is a pure indium plating solution that enables high-speed plating. It has been developed specifically for high-speed partial plating, allowing for processing on continuous lines. Additionally, it can maintain stable processing over long periods, even under conditions of strong liquid agitation and high current density. Indium 9100 meets the demands of press-fit technology. It is an ideal process for electronic components that require re-melting (reflow) of the plated film afterward.

• Non-ferrous metals
• Chemicals
• Solder

NIPHOS 965 can be used in reel-to-reel and other continuous plating systems, enabling high-speed plating. The bath life is semi-permanent and insensitive to the contamination of metal impurities, making bath management simple. Compared to the electroless process, electrolytic plating can achieve coatings that excel in amorphousness, non-magnetism, wear resistance, and corrosion resistance. It is an ideal coating for the base layer of hard gold plating on connectors.

• Non-ferrous metals
• Chemicals
• alloy

MIRALLOY demonstrates excellent uniform electrodeposition even for products with complex shapes in an alkaline cyanide bath. It can be plated with a white or yellow coating. The hardness is 550 HV for white and 400 HV for yellow, making it highly wear-resistant, suitable for applications such as bearing shells and pistons. Due to its non-magnetic properties, MIRALLOY is widely used in high-frequency connectors. With over 30 years of extensive experience, we are here to assist you with our product lineup born from technology and endless improvements.

• Non-ferrous metals
• Chemicals
• alloy

Yumikoar sealing is a post-processing process developed to protect precious metal plating films for functional components. It forms a transparent protective film just a few nanometers thick, preventing corrosion and discoloration of the plating film. The protective film significantly reduces the coefficient of friction. In connectors, it reduces insertion and extraction forces. The protective film does not affect contact resistance and allows for soldering as well.

• Chemicals
• Non-ferrous metals

The HTE platinum electrode is a product that has pure platinum coated onto a metal that is difficult to plate, such as titanium or niobium, through a special manufacturing process. It is produced using a unique method called molten salt plating. As a result, it has a high purity, is dense, and possesses excellent ductility in the platinum film. It has a longer lifespan than conventional platinum electrodes and can be processed into free shapes. It is an ideal electrode for highly reliable processes.

• Non-ferrous metals
• Rare metals

Lead electrodes are widely used for hard chrome plating, but we propose the Yumicore platinum electrode (HTE platinum electrode) as an alternative. The HTE platinum electrode offers significant advantages in terms of quality, environment, and cost. The HTE platinum electrode has an extremely long lifespan and can be reprocessed, allowing for total cost savings compared to lead electrodes after more than three years of use. We are happy to provide a cost comparison estimate between lead electrodes and HTE platinum electrodes, so please feel free to contact us.

• Non-ferrous metals
• Rare metals

Yumiko's HTE platinum electrodes are ideal for hard chrome plating. By replacing lead electrodes with HTE platinum electrodes, hazardous sludge handling for operators is eliminated. The electrodes are custom-made to fit the manufacturing line, and optimizing the design allows for reduced power consumption. The introduction of HTE platinum electrodes represents an attractive investment that balances ESG compliance with economic rationality.

• Non-ferrous metals
• Rare metals

MMO anodes are mixed metal oxide anodes with excellent shape stability that can be used for electrolysis in a wide range of applications. Thanks to the effect of the catalyst metals, they provide a lower oxygen overvoltage on the electrode surface, contributing to a reduction in power consumption and the amount of organic additives used. As a result of these effects, the lifespan of the plating bath is significantly extended. They can be processed into various shapes, allowing for designs that match the shape of the items to be plated.

• Non-ferrous metals
• Rare metals

When it comes to chrome plating, hexavalent chrome plating has mainly been used until now. However, due to environmental concerns, safety, and regulatory aspects, there is a shift from hexavalent chrome to trivalent chrome plating. In this context, Yumicoa proposes the MMO 186/187 LOC anode for decorative trivalent chrome plating. The MMO 186/187 LOC anode significantly suppresses the oxidation reaction that generates hexavalent chrome from trivalent chrome. Therefore, it becomes an essential component for the long-term stability of plating solutions and coating properties.

• Non-ferrous metals
• Rare metals