Surface treatment types of non-standard bolts:

Surface treatment is the process of forming a covering layer on the surface of the workpiece through a certain method. Its purpose is to give the product surface a beautiful and anti-corrosion effect. The surface treatment methods carried out are attributed to the following methods:

1. Electroplating: Immerse the electroplated parts in an aqueous solution containing the deposited metal compound, and pass current through the plating solution to precipitate and deposit the electroplated metal on the parts. General electroplating includes zinc, copper, nickel, chromium, copper-nickel alloy, etc.

Sometimes boiled black (bluish), phosphating, etc. are also included.

2. Hot-dip galvanizing: It is completed by immersing the carbon steel parts in a molten zinc plating tank with a temperature of about 510℃. The result is that the iron-zinc alloy on the surface of the steel gradually becomes passivated zinc on the outer surface of the product. Hot-dip aluminum plating is a similar process.

3. Mechanical plating: impact the surface of the product through the particles of the coated metal, and cold weld the coating to the surface of the product.

With over 25 years development, Ningbo Jinyi Precision Machinery Co.,Ltd is now one of the larger companies specialized in manufacturing Screws, Barrels & Tie Bars. With our 300 employees and 5 factories based in Ningbo & Zhoushan, JINYI commits to designing and supplying precision parts for the plastics, rubber, food and medical industries.

Focusing on Precise Machining, JINYI has an extremely large database of prints, drawings, and factory OEM specifications. While paying attention to skilled personnel training, we also imported series of advanced equipment, such as CNC Machining Center, CNC Turning Machine, Inner Hole Grinding Machine, 13 Meters Deep Hole Boring Machine, NC drilling machine, Nitriding Furnace Computer Control System, Centrifugal Casting Furnace, PTA Bimetallic Spraying Equipment, gear milling machine and so on.

At the same time, JINYI continues to improve Quality Control System through precise inspection during every step of the production. With our excellent quality, we have already established long term cooperation with many well-known companies both in China and overseas. We are one of the first companies to implement the ISO9001 & SGS Certification in our industry.