The low-temperature black chrome plating process is a metal surface treatment technology that enhances the corrosion resistance, wear resistance and aesthetics of metal parts by generating a black chromium oxide film on the metal surface. The following is a detailed introduction to the low-temperature black chrome plating process:
Process Flow:
Surface treatment:
First, the metal substrate is surface treated to remove dirt, oxides and other impurities. Common methods include pickling, electrolytic cleaning and mechanical polishing.
Chemical chromium plating:
After the surface treatment is completed, the metal parts are immersed in an electrolyte containing copper chromate and copper sulfate. By applying an electric current, the copper ions on the metal surface are reduced to metallic chromium, forming a uniform black chromium film.
Low-temperature oxidation:
Under vacuum conditions, chromium atoms are deposited on the surface of the substrate to form a black chromium oxide film. The working temperature of low-temperature oxidation is generally below 70°C, and high pressure is not required.
Post-treatment:
It includes steps such as cleaning, polishing, grinding and painting to increase the gloss and corrosion resistance of the black chrome plating.
Technical Features:
Corrosion resistance:
Low-temperature black chrome plating has good corrosion resistance and is suitable for surface treatment of screws, slides, splines, etc. in highly corrosive environments.
Wear resistance: Black chrome plating has high hardness and wear resistance, which can effectively extend the service life of metal parts.
Aesthetics:
Low-temperature black chrome plating process can provide a beautiful black appearance and enhance the beauty of metal objects.
Environmentally friendly:
Compared with traditional chrome plating, low-temperature black chrome plating process is carried out at a lower temperature, reducing energy consumption and environmental pollution.
Application Areas:
Low-temperature black chrome plating process is widely used in automotive, aviation, electronics and other fields, especially in fields with high aesthetic requirements and high corrosion resistance requirements.
Quality Control:
Ensuring quality control is essential to obtain consistent results in low-temperature black chrome electroplating. Appropriate inspection and testing protocols need to be established to ensure perfect surface treatment.
Maintenance and care:
In order to maintain the rich and deep black color and mirror-like finish of low-temperature black chrome plating, proper maintenance and care are essential. When cleaning, it is recommended to wipe gently with a soft cloth or use a mild cleaning solution, avoiding the use of abrasive materials and irritating chemicals.
Differences between low-temperature black chrome plating and RAYDENT treatment
Low-temperature black chrome plating and RAYDENT treatment are similar in some aspects, but there are also some key differences. Here are their similarities and differences:
Similarities:
Corrosion resistance:
Both have excellent corrosion resistance. Low-temperature black chrome plating enhances the corrosion resistance of metal parts by generating a dense black chromium oxide film. RAYDENT treatment, on the other hand, has super corrosion resistance by forming an alloyed surface layer on the metal surface, and is suitable for surface treatment of screws, slides, splines, etc. in highly corrosive environments.
Aesthetics:
Both can provide an aesthetically pleasing black appearance. Low-temperature black chrome plating makes the metal surface black and non-reflective. RAYDENT treatment also makes the surface black, enhancing the beauty of metal objects.
Differences:
Process temperature:
The operating temperature of low-temperature black chrome plating is generally below 70°C, and high pressure is not required. RAYDENT treatment, on the other hand, is an electrochemical reaction at a temperature of around 0°C to form an alloyed surface layer.
Film formation method:
The low-temperature black chrome plating process is to deposit chromium atoms on the surface of the substrate under vacuum conditions to form a black chromium oxide film. In contrast, the RAYDENT treatment forms an alloyed surface layer on the metal surface through an electrochemical reaction, in which part of the coating forms an alloy-like diffusion layer (about 1 micron) inside the metal.
Film layer characteristics:
The RAYDENT-treated film layer is completely combined with the base metal to form a semi-permanent coating that will not separate (peel off) and has a continuous protective anti-rust strong film. The low-temperature black chrome plating process focuses on generating a dense chromium oxide film to improve corrosion resistance and wear resistance.
Application range:
In addition to corrosion resistance and wear resistance, the RAYDENT treatment can also demonstrate almost permanent physical and chemical properties by impregnating various polymer resins, and is suitable for all industrial fields from outer space to the deep sea. The low-temperature black chrome plating process is more often mentioned in the fields of automobiles, aviation, electronics, etc.
In summary, the low-temperature black chrome plating process is an efficient, environmentally friendly metal surface treatment technology with multiple advantages, suitable for a variety of industrial applications.