There are many factors that affect the selection of surface treatment technology for fasteners, including usage environment, material type, performance requirements, etc. The following is a specific analysis:

Usage environment

Temperature: In high-temperature environments such as aircraft engines, high-temperature resistant coatings such as ceramic coatings should be selected to withstand high temperature oxidation and thermal stress; In low-temperature environments, the low-temperature toughness of the coating should be considered to avoid brittle cracking.

Humidity and corrosive media: In humid or corrosive environments such as oceans and chemical sites, surface treatments with strong corrosion resistance, such as galvanizing, nickel plating, or Dacromet treatment, should be used to prevent fasteners from rusting and corroding.

Wear conditions: In high friction and high wear situations, such as mechanical transmission parts, treatment techniques with good wear resistance such as hard chromium plating and chemical nickel phosphorus plating can be selected to improve the wear resistance and service life of fasteners.

Material type

Steel materials: Ordinary carbon steel fasteners are often treated with galvanizing, blackening, etc; Alloy steel fasteners can be treated with hard chrome plating, nitriding, and other methods to improve their corrosion resistance and wear resistance.

Aluminum alloy materials: generally treated with anodizing to improve corrosion resistance and hardness, and can also be treated with chemical nickel plating to meet special performance requirements.

Titanium alloy materials: usually treated with ion plating, passivation and other methods to improve their surface hardness and corrosion resistance, while maintaining the excellent performance of titanium alloys.

Performance Requirement

Corrosion resistance: For fasteners that require high corrosion resistance, such as those used outdoors or in harsh industrial environments, coatings with good corrosion resistance should be selected, such as zinc nickel alloy coatings, passivation treatments, etc.

Wear resistance: Used for fasteners subjected to frequent friction or high loads, it is necessary to have good wear resistance. Hard chromium plating, tungsten carbide coating, etc. can be used to improve surface hardness and wear resistance.

Conductivity: In some electronic devices or electrical systems, fasteners are required to have good conductivity, and surface treatments with good conductivity such as silver plating and copper plating can be selected.

Appearance requirements: For fasteners with aesthetic requirements, such as furniture, decoration and other fields, chrome plating, nickel plating and other treatments can be used to obtain a bright and beautiful surface.

Cost factors

Process cost: The cost of different surface treatment processes varies greatly, such as the relatively high cost of hard chrome plating and the lower cost of blackening treatment. On the premise of meeting the usage requirements, we will prioritize choosing processes with lower costs.

Subsequent maintenance costs: Some fasteners that have undergone surface treatment require regular maintenance during use, such as repainting and rust prevention treatment, which also increases the cost of use. When making a choice, it is necessary to consider the long-term maintenance costs comprehensively.

productivity

Processing time: Some surface treatment processes, such as chemical plating, require longer processing times, while electroplating and other processes have relatively faster processing speeds. For fasteners produced on a large scale, priority will be given to processes with high production efficiency and short processing time.

Process complexity: Complex surface treatment processes, such as the preparation of multi-layer composite coatings, require more equipment and operational steps, resulting in lower production efficiency. Simple and feasible processes are more conducive to improving production efficiency and reducing production costs.

environmental requirements

Regulatory restrictions: With the increasingly strict environmental regulations, some surface treatment processes containing heavy metals or toxic substances, such as hexavalent chromium electroplating, are restricted. It is necessary to choose processing technologies that comply with environmental regulations, such as trivalent chromium electroplating, chromium free passivation, etc.

Environmental impact: Enterprises are increasingly concerned about the impact of surface treatment processes on the environment, and tend to choose low pollution, low emission processes to reduce environmental damage and environmental risks for enterprises.