What are the surface treatment methods of fasteners

Surface treatment is the whole process of generating a soil layer on the surface of the product workpiece according to a certain method, and its significance is to give the product surface a beautiful appearance. The actual effect of corrosion resistance and the surface treatment of fasteners can be attributed to the following methods:

1. Electroplating

The part to be electroplated is immersed in a solution with the deposited metal compound, and the electroplating metal material is precipitated and deposited on the part at an amount of current according to the plating solution. General electroplating includes hot-dip galvanizing, copper, nickel, chromium, copper-nickel alloy, etc., and sometimes blackening (blue).

2. Hot dip galvanized

It is carried out by dipping the carbon steel part into a bath of molten zinc at a temperature of about 510°C. The effect is that the iron-zinc alloy material on the surface of the cast iron gradually becomes passivated zinc on the outer surface of the product. Hot dip aluminizing is a similar process.

3. Mechanical plating

The surface of the product is impacted by the particles of the coated metal material, and the coating is spray-welded to the surface of the product.

Generally, the electroplating method is mostly used for screws, but hot-dip galvanizing is used for outdoor hexagonal wood screws such as power engineering and highways; the cost of electroplating is generally 0.6-0.8 yuan per kilogram, and the hot-dip galvanizing is generally 1.5-2 yuan. /kg, the cost is higher.

Recommended Products

  • Yellow Zinc Plated,Round Domed Head Square Neck Carriage Bolt DIN603,M 6 /8 /10 /12 /16

    Diameter range (mm):M5-M24,3/16-1'Length range (mm):16-600,1''-2'
  • hex head wood screws

    Diameter range (mm):M2-M20,1/8-3/4Length range (mm):3-300,1/2-12'
  • Non-Standard Bolt countersunk hand with nib bolts

  • cup head square neck bolts with small head and small neck

  • cup head square neck bolts with small head and Yellow neck

  • Flat countersunk head elevator bolts

  • Zinc Plated,Torx Truss Head Longer Machine Screws,Grade 4.8

    Diameter range (mm):M5-M20,3/16-1"Length range (mm):5-300,3/16-12"
  • Yellow Zinc Plated,Truss Head Philips Machine Screws,Grade 6.8

    Diameter range (mm):M5-M20,3/16-1"Length range (mm):5-300,3/16-12"
  • Din965 Cross Recessed Raised Countersunk Head Machine Screws ,Grade 4.8 , Zinc Plated M2 M3 M4 M5 M6 M8 M10 M12

  • gold zinc round head plated slotted machine screws,Grade 4.8,

  • Zinc Plated,INOX Slotted Round Head Machine medium,Screws,Grade 4.8

  • T shape bolts for slot Non-standard Bolt

    Size: M2.5 to M24 Length: Up to 300mm Standard: Non Standard, we can manufacture as customer's draw...