Common Anti-corrosion Methods for Mining Rock Bolt

The use of higher-tensile steels for rock bolts and anchor bolts, presents a risk for a greater incidence of corrosion, which is dangerous in underground environments.
Self Drilling Resin Rock Bolt

Various types of anti-corrosion methods for mining rock bolts are being developed. As mining rock bolts are made of steel, if they are stored and pretreated improperly, once rust occurs, it will lead to serious accidents with loss of both human lives and treatures. Usually it is started with corrosion and scrap. Therefore, anti-corrosion treatment measures for mining rock bolt are very necessary. 

The problem of corrosion and cracking of rock bolts in coal mines and other underground mines, and high variability of mine water corrosivity in mining industry, it has been noted by late corrosion study. The use of higher-tensile steels for rock bolts and anchor bolts, presents a risk for a greater incidence of corrosion, which is dangerous in underground environments. There are many other corrosion issues that need to be taken care of but are not included here.

Rock Bolt Corrosion Situation

The problem of corrosion and cracking of rock bolts in coal mines and other underground mines, and high variability of mine water corrosivity in mining industry, it has been noted by late corrosion study. The use of higher-tensile steels for rock bolts and anchor bolts, presents a risk for a greater incidence of corrosion, which is dangerous in underground environments. There are many other corrosion issues that need to be taken care of but are not included here.

Common Anti-corrosion Methods for Mining Rock Bolts

  • Brush coating method:
    Coating is a widely used anti-corrosion method, and it is an indispensable anti-corrosion material and identification mark on mining anchor rock bolt products. Paint is also a non-metallic material. It is usually made of synthetic resin, rubber slurry, vegetable oil, solvent, etc., and covers metal surface to isolate medium from atmosphere to achieve anticorrosion.
  • Metal Surface Treatment:
    Metal surface treatment processes include sleeping coatings, surface penetration, and surface oxidation and passivation. Its purpose is to improve corrosion resistance and mechanical capabilities of metal.
  • Add corrosion inhibitor:
    Adding a small amount of other special substances to corrosive medium and corrosive substances can greatly slow down corrosion rate. This special substance is called corrosion inhibitor. Corrosion inhibitor is always consist of sodium nitrite and sodium chromate, which can form a passivation film on anchor bolt surface. The solvent can slowly dissolve corrosion inhibitor and can also act as a lubricant. Zinc powder is added as a sacrificial metal. In fact, zinc is also a corrosion inhibitor. It can first combine with chloride in asbestos, so as to reduce chance of contact between chloride and rock bolt, thereby achieving purpose of anticorrosion. If corrosion inhibitors such as red lead and calcium lead acid are added to coating, spraying on the surface can prevent atmospheric corrosion.

Leave a Replay

Top