Hexagon bolt is a common bolt fitting in fasteners and plays an important role in fixing parts.Today, the editors will discuss the blackening process and rust prevention methods of hexagonal bolts.I hope it’s helpful to you.The details are as follows.

Hex bolt blackening process introduction

1, high temperature black

Hexagon bolts have excellent blackening effect, good corrosion resistance, wear resistance, strong black film bonding strength, and the surface of the processed workpiece has wear resistance, reduce friction, scratch resistance, bite resistance and fatigue resistance characteristics., corrosion resistance and self-lubricating properties.

2, low temperature black

The quality of low temperature blackening process of hexagon bolt is better than that of the same industry.The processed workpiece has a strong black film, good adhesion, black after oil seal, and has a certain wear resistance.In line with the national standard GB/T15519, but can not compete with high temperature.

3, Extinction black

Hexagon bolt blackening process after special treatment, so that the workpiece without luster, no reflection of the oxide black film, black film bonding firm, firm, no ash float, good wear resistance.

Rust prevention method for hexagon bolts

1. Painting:

It refers to the method of uniformly applying a coating on the surface of the workpiece.Coating method is based on the different requirements of the workpiece and product quality requirements.Generally divided into dip coating, spraying and brush coating three methods.

2, rust removal:

The rust removal process in bolt machining is different from the treatment method before painting.It uses pickling and rust removal.This is because most of the machined parts are high-strength bolts, nuts and high-strength stamping parts.Hydrogen embrittlement can lead to hydrogen embrittlement after pickling and affect product quality. 

3. Curing:

After the wet film is coated on the surface of the workpiece, it is oven-baked and cured by the following reaction changes to form the coating.

The above is the blackening treatment and antirust method of hexagonal bolt.I hope everyone can understand the blackening process of hexagon bolts and anti-rust methods.