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At present, there are three main types of hydraulic rods, hydraulic pillars used in underground coal mines, hydraulic rods of construction machinery, hydraulic rods of river environment hoist. These three kinds basically adopt the traditional electroplating chromium technology to protect its surface. Among them, the hydraulic rod in underground coal mine and river environment is faced with the problem of protection and wear resistance, and the hydraulic rod in construction machinery is mainly faced with the problem of wear resistance.

Hydraulic support is one of the indispensable supporting equipment for comprehensive mechanized coal mining. Because of the bad underground environment, the surface of the column is often invalid because of corrosion and bruise. With the requirements of national environmental protection, the traditional chrome-plating process is being eliminated, column surface treatment technology is a major problem facing column manufacturers and maintenance enterprises. The supersonic flame spraying technology is used in the manufacture and remanufacture of the hydraulic support column, which is the best technology to replace the traditional chrome plating.

The hydraulic support on the construction machinery is generally used in the atmospheric environment. After frequent use, the chromium plating layer on the surface cannot meet the wear-resistant performance. The life of the tungsten carbide coating is 5-10 times higher than that of the chromium plating layer by supersonic spraying.

Hydraulic hoist in river environment, in contact with water, is faced with problems such as rust prevention, corrosion prevention, and sediment erosion wear, etc. Thermal spraying process is also needed to better protect the hydraulic rod.