Hex bolts are bolt fittings commonly found in fasteners and play a large role in the imprisonment of parts.

Hex bolt blackening process introduction

1, high temperature black

　　Hex bolts have excellent blackening effect, good corrosion resistance, wear resistance, strong black film bonding strength, and the surface of treated workpieces are wear-resistant, friction-reducing, anti-scratch, anti-seize and anti-fatigue. , corrosion resistance and self-lubricating properties.

2, low temperature black

　　The quality of the hexagonal bolt low-temperature blackening process is better than that of the same industry. The treated workpiece has a strong black film, good bonding force, black after oil seal, and certain wear resistance.

In line with national standard GB/T15519, but can not compete with high temperature.

3, optical extinction black

　　The hexagonal bolt optical extinction blackening process is specially treated to make the workpiece matt, non-reflective black oxide film, black film bonding strong, firm, no hanging ash, good wear resistance.

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Hex bolt anti-rust method

1, painting:

　　It refers to a method of uniformly coating a coating on a surface of a workpiece. The coating method is based on the different requirements of the workpiece and product quality requirements.

Generally divided into three methods of dip coating, spraying and brushing.

2, rust removal:

　　The rust removal process in bolt processing is not like the pre-painting treatment method. It uses pickling and rust removal.

This is because most of the processed workpieces are high-strength bolt nuts and high-strength stamping parts.

Hydrogen embrittlement will cause hydrogen embrittlement after pickling and affect product quality.

3, Curing:

　　After the wet film is coated on the surface of the workpiece, it is subjected to an oven baking curing process to form a coating layer by the following reaction changes.

　　The above is about the blackening process and anti-rust method of hexagon bolts. I hope everyone can understand the blackening process and anti-rust method of hexagon bolts.