What surface finishes are available for fasteners?

Generally, fasteners are available in the following surface treatments, namely electro-galvanized, phosphate, oxidized, electro-cadmium plated, electro-chromium plated, silver-nickel plated, hot-dipped zinc, zinc-nickel alloy, zinc penetration, and Dacromet.

1. Electro-galvanized: electro-galvanized is the most commonly used plating of commercial fasteners, characterized by being cheap and good-looking, can be black and army green, but with general corrosion resistance, electro-galvanized zinc processing will produce hydrogen embrittlement, so more than 10.9-grade bolts are generally not galvanized treatment. Although hydrogen can be removed, the general production plant will not take the initiative to remove it unless it is required for specific customers.

2. Cadmium plating: cadmium plating treatment of fasteners, corrosion resistance is excellent, but the price of zinc plating is 15-20 times, generally only used in specific environments, such as sea and oil drilling.

3. Chrome plating: Chrome plating, a process that plays a general decorative role in the corrosion resistance requirements of the industrial sector, is challenging to apply. Using stainless steel strength is not enough, only with chrome-plated fasteners.

4. Phosphating: Phosphating is also a commonly used fastener surface treatment method because it is cheap, and corrosion resistance is worse than galvanized. If you want to resist corrosion, after phosphating, fasteners should be coated with a layer of oil on their surface, and the corrosion resistance should be high or low with the oil-painted oil. In general, many industrial fasteners are treated with a phosphating oil coating and a high-strength phosphating treatment to avoid hydrogen embrittlement problems.

5. Silver-plated, nickel-plated: silver-plated can prevent corrosion but also act as a lubricant fastener; because of the unique nature of silver, silver-plated fasteners are generally used for high-temperature work; nickel-plated, not only can be not only corrosion-resistant but also electrically conductive, usually used in vehicles at the battery.

6. Zinc infiltration: zinc infiltration for zinc powder solid metallurgy heat diffusion coating. It is characterized by excellent uniformity, minor errors, And no pollution during processing; it is usually used for threaded and blind holes and other fasteners.

7. Hot dip zinc: hot dip zinc for zinc heated to liquid under the thermal diffusion coating. It has good corrosion resistance but is thicker and generally needs a specific method for everyday use because of the hot dip zinc processing temperature, so it can not be used for fasteners of more than 10.9 grade.

8. Dacromet: Dacromet is a surface treatment made of fasteners with good performance, generally used for fasteners requiring high corrosion resistance.

9. Oxidation: oxidation is the simplest method, and blackening + oiling can be completed, but industrial fasteners are the most popular treatment. After oxidation treatment, fasteners will not rust, but the performance is abysmal, and you must be careful when choosing.

10. Zinc-nickel alloy surface treatment methods. First is the chemical plating process, which forms a layer of chemical plating on the surface of zinc-nickel alloy to improve the surface properties. The chemical plating layer can improve the zinc-nickel alloy's gloss, corrosion, and wear resistance. Second is the electroplating method, which enhances the surface properties by electroplating a metal plating layer on the surface of the zinc-nickel alloy. The plating layer can improve zinc-nickel alloys' hardness, wear, and corrosion resistance. In addition, surface treatment methods, such as spraying and heat treatment, can improve the surface quality and performance of zinc-nickel alloys.

These are the ten ways of fastener surface treatment; fasteners have a wide range of applications, including energy, electronics, electrical appliances, machinery, chemicals, automobiles, ships, medical, aviation, food, and beverage equipment, metallurgy, molds, hydraulics, and other industries.

Mechanical equipment, vehicles, ships, railroads, bridges, buildings, structures, tools, instruments, and the chemical industry have fasteners, the most widely used machinery. Various specifications, performance, and use of standardized, serialized, and high generality characterize it. Fasteners in the most commonly used industries also belong to the automotive industry. With the development of the automotive industry, people have also put higher requirements on fastener products and the surface treatment process. Still, the quality and design have new requirements.

The surface treatment process of auto parts mainly includes the following aspects:

1. Acid washing treatment: Acid washing removes oxides and other impurities from the surface of auto parts. Acid-washing solutions use hydrochloric acid, sulfuric acid, phosphoric acid, etc., through immersion and agitation to clean the surface and remove oil, rust, oxidized skin, and other impurities.

2. Electroplating treatment: Electroplating is coating the surface of automobile parts with a layer of metal to improve their quality through anti-corrosion, beautification, increased hardness, and other functions. Plating methods include chrome plating, nickel plating, zinc plating, and so on, which can be chosen according to different needs.

3. Oxidizing treatment: An oxidizing treatment forms a layer of oxide film on the surface of auto parts through an oxidizing reaction to increase their corrosion resistance and beauty. Oxidation treatments include anodic oxidation, cathodic oxidation, and so on.

4. Coating treatment: Coating involves spraying a protective coating on the surface of the auto parts. Standard coatings include silicon, tungsten, titanium, and others, which can increase the hardness and abrasion resistance of the auto parts.

5. Plasma surface treatment process: the surface of automobile parts is treated by plasma surface treatment technology, which is applied in many methods, such as pretreatment before coating or plating, and it can also be used to replace the flame for processing

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