遠州クロム List of Products and Services

Our company handles "hard chrome plating," which excels in corrosion resistance, heat resistance, and has high hardness in the range of HV800 to 1000, resulting in excellent wear resistance. By applying hard chrome plating to aluminum substrates, we can achieve surface treatment that results in lightweight, high hardness, and wear-resistant products. We can propose products that are lightweight, high hardness, and excellent wear resistance by applying hard chrome plating not only to iron, stainless steel, and brass but also to lightweight materials like aluminum. 【Features】 ■ High hardness ■ Wear resistance ■ Corrosion resistance ■ Lubricity and sliding properties *For more details, please download the PDF or feel free to contact us.

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Electroplating is a process in which the item to be plated is used as the cathode (negative electrode) and the metal to be plated is used as the anode (positive electrode) in an electrolytic solution containing metal ions. The mechanism of electroplating involves a reduction reaction occurring at the cathode, where metal is deposited and grows as a plating film. The reduction reaction refers to the process at the surface of the cathode (the product to be plated), where metal ions in the plating solution (the state in which the metal is dissolved in the plating solution) are converted into metal (losing charge) by direct current (electrons). Conversely, an oxidation reaction occurs at the anode, where metal dissolves into the plating solution and becomes metal ions. These two reactions occur simultaneously at the cathode and anode. *For more detailed information, please refer to the related links. Feel free to contact us for further inquiries.*

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The hard chrome plating treatment on aluminum materials (aluminum) is different from the usual process. It involves zinc replacement and nickel plating treatment, followed by the formation of a hard chrome plating film on top. Aluminum reacts with oxygen in the air, and its surface is covered with a film of aluminum oxide (Al2O3). This oxide film is a chemically stable substance, and to apply hard chrome plating, it is necessary to remove this oxide film. However, in the case of hard chrome plating, even if the surface covered by this oxide film is mechanically scraped off, as soon as it is immersed in the plating solution, an oxidation reaction occurs due to the plating solution, and a film of aluminum oxide is formed again, making plating treatment impossible with conventional methods. *For detailed information on the column, please refer to the related link. For more information, feel free to contact us.

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• aluminum

One of the characteristics of hard chrome plating is its lubricity. As is generally well known in terms of lubrication, it is possible to obtain this characteristic by allowing lubricating oil to penetrate into the cracks that occur due to tensile stress during the electroplating (plating process) of the hard chrome plating film. However, lubricity exists not only in wet environments but also in dry environments. The principle of lubricity is said to be that when the chrome-plated surface and another substrate slide against each other, the slight wear of the Cr2O3 (chromium oxide) on the plating surface causes Cr2O3 particles to act as a lubricant, thereby reducing the coefficient of friction. *For more detailed information, please refer to the related links. For further inquiries, feel free to contact us.

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In hard chrome plating treatment, a large amount of hydrogen gas is generated during the processing in the plating bath and is absorbed into the deposited chrome plating layer. The amount of hydrogen accumulated in the plating layer varies depending on factors such as plating thickness, plating time, and treatment bath, but it is generally considered that sufficient removal can be achieved by heating (baking) at around 190°C to 220°C for about 2 hours. There is also a description of hydrogen embrittlement in "JIS H8615 Industrial Chrome Plating," but it is noted for reference, and the conditions for hydrogen embrittlement removal will be determined considering factors such as plating thickness. *For detailed content of the column, please refer to the related links. For more information, feel free to contact us.*

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One of the effects of hard chrome plating is its corrosion resistance (rust prevention effect). The surface of hard chrome plating is covered with an oxide film, making it passive in the air (atmosphere). The chromium coating has a natural potential comparable to that of precious metals like gold and platinum, and it possesses stable properties in natural environments. Similarly, it is also stable in alkaline conditions, but when it comes into contact with non-oxidizing acidic substances, the passive film on the surface can easily dissolve, and the chromium itself may also dissolve, inevitably compromising its corrosion resistance. *For more detailed information, please refer to the related links. Feel free to contact us for more details.

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As indicated by the term electroless nickel plating (Ni-P), the coating contains a significant amount of phosphorus in addition to the main component, nickel. Based on the phosphorus content, electroless nickel plating is mainly classified into three categories: low phosphorus, medium phosphorus, and high phosphorus. The characteristics of the plating coating change depending on the phosphorus content. *For detailed information, please refer to the related links. For more information, feel free to contact us.*

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In natural environments, the corrosion resistance (rust prevention effect) of electroless nickel plating can be considered effective; however, in actual usage situations, it is greatly influenced by the chemicals and substances that come into contact with the electroless nickel plating layer, so this is not always the case. Even with highly corrosion-resistant electroless nickel plating, if the plating layer itself corrodes or dissolves, it will naturally lose its corrosion resistance. Therefore, the effectiveness of electroless nickel plating in terms of corrosion resistance varies depending on the usage environment. *For detailed content of the column, please refer to the related links. For more information, feel free to contact us.*

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One of the main reasons for the use of electroless nickel plating is the uniformity of the plating film (thickness). Unlike electroplating, where the plating film tends to form more easily in areas with higher current density (corners and edges) due to their shape, electroless nickel plating utilizes the reduction reaction between the plating solution and the substrate (material) to generate a nickel coating uniformly on the surface of the substrate, as it comes into contact (immersion) with the plating solution. The principle is that when the substrate is immersed in the plating solution, the reducing agent, hypophosphite, in the solution is oxidized to phosphite, and during this process, it releases electrons, which reduce the nickel ions in the plating solution and deposit them as a nickel coating on the surface of the substrate. *For detailed content of the column, please refer to the related links. For more information, feel free to contact us.*

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What is the difference between electroplating nickel and electroless nickel plating? Naturally, it is clear that one uses electricity for plating while the other does not, and it is evident that the equipment and processes are different. However, it seems that in both cases, nickel, which is a metal, is generated on the surface of the product. *For more details on the column, please refer to the related links. If you have any questions, feel free to contact us.*

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There are different types of plating baths for hard chrome plating treatment. The performance varies depending on the differences in the baths, and even when referring to hard chrome plating, it is necessary to select based on the specific functions required. There are mainly three types of hard chrome plating baths: the traditional Sargent bath, the mixed catalyst bath also known as the fluoride bath, and the modern high-efficiency and high-function HEEF bath (micro-crack bath). *For detailed information, please refer to the related links. For more information, feel free to contact us.

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In recent years, the reduction of environmentally hazardous substances and the RoHS regulations have led to a global ban on the use of products containing hexavalent chromium. Although it is often confused, it is common to use hexavalent chromium in hard chrome plating; however, the hard chrome plating coating itself is in the zero-valent state, meaning it is metallic chromium and does not contain hexavalent chromium. However, since it is a plating solution that uses hexavalent chromium, if the plated item (product) has a complex shape or many cavities, there is a risk that the solution containing hexavalent chromium may adhere and remain. Therefore, thorough cleaning must be performed after the plating process. *For detailed content of the column, please refer to the related links. For more information, feel free to contact us.

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Basically, it is possible to apply electroless nickel plating to cast materials (FC・FCD), but generally, cast materials are considered difficult materials for electroless nickel plating. The reasons for this are the oxide film on the surface of the material, casting defects (pores), and graphite. Regarding the oxide film on the surface of the material, it must be removed not only for cast materials but also for any plating process, including electroless nickel plating. In most cases, it can be addressed through pre-treatment conditions. *For detailed information in the column, please refer to the related links. For more details, feel free to contact us.

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There are references to hard chrome plating and Kanizen plating in your request or the drawings you sent, and occasionally, we receive inquiries from customers about the differences between the hard chrome plating and electroless nickel plating that we handle. To conclude, hard chrome plating = hard chrome plating = industrial chrome plating = HCr = ICr (chrome = chromium) all refer to the same type of plating. Similarly, electroless nickel plating = electroless nickel-phosphorus plating = Kanizen plating are also the same. *For detailed information, you can view it through the related links. Please feel free to contact us for more details.

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As a process after plating treatment, baking treatment (heat treatment) may be applied. In electric plating, as stated in JIS, the presence or absence of baking treatment and its conditions are to be agreed upon between both parties. It is necessary to determine whether it is needed, considering the usage of the product and its intended lifespan, as well as which conditions are suitable; it is not necessarily required to be performed. As mentioned above, in electric plating such as hard chrome plating, baking treatment aimed at removing hydrogen embrittlement is common. However, baking treatment may also be performed in electroless nickel plating, which does not use electricity during the plating process. *For detailed content of the column, please refer to the related links. For more information, feel free to contact us.

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Although there are various grades of aluminum, if the appropriate processes and conditions for each grade are not selected in hard chrome plating, a proper plating film cannot be obtained. Our company excels both technically and in terms of track record with A5052 and ADC12. We conduct daily processing in current mass production, and over the past five years, we have achieved a delivery defect rate of 0% and an in-process defect rate of less than 0.0002%. *For more detailed information, please refer to the related links. For further inquiries, feel free to contact us.

• aluminum
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At Enshu Chrome Co., Ltd., we handle "electroless nickel plating." This process does not use electricity to deposit a nickel film on the metal surface through chemical reduction. Therefore, it ensures uniformity in plating thickness even on extremely complex shapes and within fine diameters. Additionally, it allows for complete plating, offers excellent corrosion resistance, and can achieve a hardness of HV900 or less through heat treatment. The cross-section of electroless nickel plating has a layered structure, resulting in fewer pinholes compared to electroplated nickel. 【Features】 ■ Uniformity of plating thickness ■ High hardness ■ Corrosion resistance ■ Layered structure *For more details, please refer to the PDF document or feel free to contact us.

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We have a dedicated aluminum line in our company. By applying hard chrome plating to aluminum substrates, we can perform surface treatment processes that result in products that are lightweight, high in hardness, and wear-resistant. We have a long track record of mass production of A5000 series products, and there are many other grades that have been tested successfully. We also have experience and know-how in hard chrome plating treatment for super duralumin, based on requests from our customers. 【Features】 ■ High hardness ■ Wear resistance ■ Corrosion resistance ■ Lubricity and sliding properties *For more details, please refer to the PDF document or feel free to contact us.

• Plating Equipment
• aluminum

At Enshu Chrome Co., Ltd., we handle "hard chrome plating." It is characterized by excellent corrosion resistance, heat resistance, and high hardness ranging from HV800 to 1000, which also provides outstanding wear resistance. We can offer products that are lightweight, high in hardness, and excellent in wear resistance by applying hard chrome plating not only to iron, stainless steel, and brass but also to lightweight materials like aluminum. Additionally, we can accommodate various applications for plating areas, including full plating, partial plating, inner diameter plating, and flash plating. We have a dedicated plating tank for prototypes, single items, and non-mass-produced products, separate from our mass production hard chrome plating line. 【Features】 ■ High hardness ■ Wear resistance ■ Corrosion resistance ■ Lubricity and sliding properties *For more details, please refer to the PDF document or feel free to contact us.

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"M・C Film" is a multifunctional coating that can be colored. Due to covalent bonding, it has superior adhesion compared to conventional coatings, and if applied to metal, film deposition is possible. By performing this treatment after functional plating, it can provide even higher functionality. Currently, only the hybrid silica-based film "M・C Film α," which utilizes the sol-gel method and combines inorganic and organic materials, has been verified for practical use. 【Features of M・C Film α】 ■ Utilizes the sol-gel method ■ Can be applied to metal surfaces ■ Achieves strong adhesion through covalent bonding using the oxide film on the metal surface ■ Can be colored with metallic colors that enhance the underlying metal ■ Maximizes effectiveness with a thin film of 8μm or more (3-5μm is also acceptable) *For more details, please refer to the PDF document or feel free to contact us.

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Our company specializes in hard chrome plating and electroless nickel plating. Hard chrome plating is the most commonly used electroplating for machine parts. It has a hardness of 800Hv to 1,000Hv, excellent wear resistance and corrosion resistance, and features a low friction coefficient. Electroless nickel plating utilizes the reducing power of chemicals without using electricity to deposit a nickel coating on metal surfaces. By maintaining a constant liquid concentration, it is possible to achieve uniform plating on both sharp and recessed areas. 【Products】 ■ Hard Chrome Plating - Pulleys for motorcycles (aluminum base) - Transmission parts for automobiles and motorcycles - Jigs, tools, and others ■ Electroless Nickel Plating - Differential parts for automobiles, parts for motorcycles *For more details, please download the PDF or feel free to contact us.

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• Surface treatment contract service