The surface treatment methods for tungsten alloy rods mainly include the following techniques:

1. Chemical nickel tungsten phosphorus alloy plating

A dense coating is formed by depositing an amorphous alloy layer on the surface of steel using an alkaline solution. Process parameters: pH 8.5-9.0, temperature 85-90 ° C, coating thickness of 20-30 μ m, Vickers hardness of over 1000, corrosion resistance better than pure nickel phosphorus coating.

2. Electroplating process

Nickel tungsten alloy coating is generated by cathodic discharge using electroplating solutions such as sodium tungstate and nickel sulfate. The coating has fine and bright crystallization, high temperature hardness, and its corrosion resistance has been verified through nitric acid testing. A recycling tank and pure water cleaning system are required to reduce pollution.

3. Micro arc oxidation

Suitable for metals such as aluminum, magnesium, titanium, etc., to generate ceramic coatings on the surface through high-voltage arc discharge. If tungsten alloy is subjected to special pretreatment, it can also be attempted, but the process adaptability needs to be verified. Typical parameters: voltage 300-750V, thickness up to 70 μ m, hardness 1000-2000HV.

4. Other auxiliary technologies

Laser surface strengthening: using high-energy laser local treatment to enhance wear resistance.

Blueing/phosphating: forms an oxide film or phosphate conversion film, used for corrosion prevention or cold working lubrication.