In the field of hardware manufacturing and precision sheet metal processing, material quality is the foundation, and surface treatment is the lifeline of product quality. With 20 years of deep cultivation in the industry, Ruichi Hardware has always regarded surface treatment processes as a core competitive strength of its products. Tailored to different substrate characteristics, application environments and high-end standards at home and abroad, we have built a comprehensive, refined and customized surface treatment system. This ensures every product boasts integrated strength, weather resistance, aesthetic appeal and long-lasting protective performance from the inside out, truly fulfilling our quality commitment of “durability, adaptability and reliability”.

Backed by a mature production and quality control system, Ruichi has established a full-process surface treatment matrix centered on hot-dip galvanizing and electro-galvanizing, supplemented by diverse processes including powder coating, electrophoretic coating, spray painting, dacromet, blackening, anodizing, polishing & brushing, and sand blasting. This matrix is perfectly compatible with eight major substrates such as cold-rolled steel sheet, hot-rolled steel sheet, stainless steel, alloy steel, copper, spring steel and aluminum alloy. We provide tailor-made professional protection solutions for harsh working conditions including indoor, outdoor, humid, saline-alkali, highly corrosion, heavy load and high/low temperature environments.

Hot-dip galvanizing features a thick coating, strong adhesion and an ultra-long anti-corrosion lifespan. It is widely applied to products exposed to the outdoor environment for long periods such as wood house connectors, architectural hardware and engineering machinery, effectively resisting erosion from wind and rain as well as environmental corrosion. Its process principle is to immerse hardware components, pre-treated by derusting and degreasing, into molten zinc liquid. Utilizing the high-temperature reaction between zinc and iron, a dense zinc-iron alloy layer and a pure zinc layer are formed on the component surface. Through the sacrificial anode protection of zinc, corrosive media such as air and water vapor are isolated from the substrate, achieving long-term anti-corrosion effects.

Electro-galvanizing delivers a uniform coating, a smooth and clean appearance and high precision. It is mostly used for products with strict requirements on dimensions and appearance, such as standard fasteners, garage door accessories, electronic and electrical products, and instruments & meters. Its principle is to utilize electrolysis: the hardware component is used as the cathode and a zinc plate as the anode, both placed in an electrolyte containing zinc ions. After applying direct current, zinc ions in the electrolyte are uniformly deposited on the surface of the cathode component, forming a thin and dense zinc coating. This coating not only provides anti-corrosion protection but also ensures the dimensional accuracy and aesthetic texture of the component.

Powder coating creates a full-bodied coating with high impact resistance and stable color fastness, making it an ideal choice for home appliance casings, furniture hardware. Its principle is to charge powder coating materials (mainly epoxy resin, polyester resin, etc.) with static electricity via electrostatic spraying equipment, which makes the powder particles adsorb to the surface of earthed hardware components. The components are then sent to a high-temperature curing oven, where the powder coating melts, flows and cures to form a uniform and tough protective coating with both anti-corrosion and decorative effects.

Electrophoretic coating produces a uniform and dense paint film with strong anti-corrosion performance, making it particularly suitable for precision components that are difficult to spray with conventional methods, such as complex three-dimensional structural components, automotive structural parts and medical device accessories. Its principle is to place the hardware component as the cathode (or anode) in an electrophoretic coating tank. Driven by an electric field, charged resin particles in the coating liquid migrate directionally and deposit on the component surface, forming a uniform, pinhole-free paint film. This process can reach the edges, corners and gaps of components that are hard to cover with conventional spraying, improving the overall anti-corrosion performance.

Spray painting is a flexible process with wide adaptability, capable of meeting various customized appearance and protection requirements. Its principle is to atomize liquid coating into tiny particles through a spray gun and spray them evenly on the pre-treated surface of hardware components. The coating particles level and dry on the component surface to form a protective and decorative coating. Different types of coatings can be selected according to requirements to adapt to various anti-corrosion grades and appearance needs, featuring flexible operation and compatibility with all types of complex components.

For high-end anti-corrosion and high-strength scenarios, Ruichi adopts the dacromet coating process, which is free of hydrogen embrittlement, resistant to high temperature and excellent in salt spray resistance, providing super protection for alloy steel stress-bearing parts, auto parts, agricultural machinery and security & transportation facilities. Its principle is to mix zinc powder, aluminum powder and special binders to make dacromet coating liquid, which is evenly applied to the surface of hardware components by dip coating, spray coating and other methods. After high-temperature baking, the zinc powder, aluminum powder and binders in the coating liquid react to form a dense zinc-aluminum composite coating. Through the dual anti-corrosion effect of the sacrificial anode protection of zinc and aluminum and the physical isolation of the coating, it achieves superior anti-corrosion performance without the risk of hydrogen embrittlement, making it suitable for high-strength components.

Blackening yields a calm texture and good rust resistance, and is mostly used for precision mechanical parts, tool assemblies and instrument & meter structural components. Its principle is to immerse hardware components into a high-temperature black oxide solution containing sodium hydroxide, sodium nitrite and other ingredients. Through a chemical oxidation reaction, a black iron tetroxide film is formed on the component surface. This dense film can effectively isolate air and water vapor to achieve short-term rust prevention, and at the same time endows the component with a calm appearance texture, featuring a simple process and moderate cost.

Anodizing is specially developed for aluminum alloy, featuring high hardness, wear resistance and aesthetic appeal. It is widely used for new energy equipment, lightweight components, high-end furniture hardware and electronic & electrical product casings. Its principle is to use the aluminum alloy component as the anode and place it in an electrolyte such as sulfuric acid and oxalic acid. After applying direct current, an oxidation reaction occurs on the component surface to form a dense aluminum oxide film. This film not only improves the corrosion and wear resistance of aluminum alloy, but also can be dyed to achieve a variety of colors, combining protective and decorative functions.

Polishing & brushing endows metal with a delicate texture, and is suitable for stainless steel and high-end copper accessories, sanitary hardware and furniture decorative parts. Its principle is to remove oxide layers, scratches and other defects on the surface of hardware components through mechanical grinding or electrochemical polishing, making the surface smooth and flat. Brushing is then performed to form uniform filamentary textures on the surface. This process not only improves the surface finish and fingerprint resistance of the component, but also endows the metal with a unique delicate texture, highlighting high-end quality.

Sand blasting serves as a powerful pre-treatment process, effectively removing oxide scales and impurities and greatly improving coating adhesion, laying a solid protective foundation for auto wheel covers, special-shaped rotating body hardware components and complex sheet metal parts. Its principle is to use compressed air to spray abrasive materials such as quartz sand and emery onto the surface of hardware components at a high speed. Through the impact and grinding of the abrasives, oxide scales, rust, oil stains and impurities on the component surface are removed, and a rough micro-texture is formed on the surface, increasing the contact area between the coating and the substrate. This improves the adhesion of subsequent plating or coating layers and avoids problems such as peeling and blistering.

From process selection and process control to quality inspection, Ruichi adheres to strict standardized control throughout the entire process. Every surface treatment process is implemented in strict accordance with specifications to ensure uniform coating/plating thickness, stable adhesion and up-to-standard anti-corrosion performance. All products undergo multiple rigorous inspections such as salt spray testing, wear resistance testing, hardness testing and adhesion testing before leaving the factory, ensuring compliance with the stringent standards of overseas markets. We truly guarantee product stability and durability from the source and in every detail.

With a comprehensive surface treatment system and strong production and manufacturing capabilities, Ruichi’s products cover five finished product series including gutter systems products, HVAC accessories, garage doors accessories, wood house connectors and marble brackets, and we fully undertake ODM & OEM of hardware products. Our service scope spans numerous industries such as construction, automotive, furniture, electronics, new energy, medical devices, aerospace, agricultural machinery, security & transportation, engineering machinery and building curtain walls. We provide one-stop surface treatment and forming solutions for building hardware, engineering machinery, home appliance frames, furniture, auto parts, home appliance casings, special-shaped rotating body components and complex three-dimensional sheet metal parts.

Ruichi will continue to optimize and upgrade the full range of surface treatment technologies including powder coating, hot-dip galvanizing, electro-galvanizing, anodizing, electrophoretic coating, spray painting, dacromet , blackening, polishing & brushing, and sand blasting, and keep moving towards environmental protection, high efficiency, precision and high-end development. We are committed to providing higher-quality and more adaptable hardware products for customers in all industries around the world, and offering long-lasting and reliable support for every product with professional surface treatment processes.