During the drilling, after the action of mineral water, the rock drilling tools are very prone to be corroded, which in turn causes corrosion fatigue of the rock drilling tools and makes their service life shorter. To avoid corrosion fatigue of rock drilling tools, anti-corrosion treatment of rock drilling tools is an effective solution. If only alloying elements or heat treatment methods are used, it does not fundamentally improve the corrosion fatigue resistance of rock drilling tools. Therefore, in the manufacturing of rock drilling tools, the anticorrosion treatment should be applied to the rock drilling tools while optimizing the geometric structure and parameters of rock drilling tools, alloying, heat treatment, surface strengthening, and other processes to improve their mechanical properties.

Methods of anti-corrosion treatment for rock drilling tools

1. Improve the smelting quality of hollow steel and reduce the non-metallic inclusions in steel as much as possible.

2. Improve rolling quality, reduce or eliminate various surface defects as much as possible, and promote the geometric structure, dimensional accuracy, and surface condition of hollow material to meet the technical requirements.

3. Eliminate micro-cracks and corrosive dirt adhering to the inner wall of water holes.

4. Anti-corrosion treatment of the inner and outer surface of the rock drilling tools, etc.

The above methods can play an important role in the anti-corrosion fatigue ability of rock drilling tools in the actual drilling use.

Requirements of anti-corrosion process of rock drilling tools

When performing anti-corrosion treatment on the inner and outer surfaces of rock drilling tools, the purpose is to create a layer of coating on the inner and outer surfaces of the metal to isolate the metal from corrosive substances such as mineral water and avoid corrosion fatigue. Therefore, during the anti-corrosion operation, the anti-corrosion film should have strong adhesion, and the anti-corrosion film should have sufficient strength and toughness. Moreover, the anticorrosive film will not be destroyed under certain pressure and flowing mineral water when the rock drilling tools are bent or cracked. The process is simple, easy to operate, safe, reliable, and low-cost.

The anti-corrosion treatment of rock drilling tools can not only improve the appearance quality of rock drilling tools but also improve the anti-corrosion ability of the internal and external surfaces of rock drilling tools, reduce the influence of corrosion by mine water on the internal and external surfaces of rock drill tools in the process of use, and improve the service life of rock drilling tools. Only when the requirements of the anti-corrosion of rock drilling tools are met, can the anti-corrosion treatment of rock drilling tools be of practical significance.