Because of its high strength, corrosion resistance, high specific strength, wear resistance, high-temperature resistance, low-temperature resistance, non-magnetic properties, biophilic, and rich resources, titanium and titanium alloys have been favoured by all walks of life this year.
And gradually in oil drill pipe, oil exploration, oil drilling platform, vacuum coating, mining equipment, coal chemical equipment, pressure equipment accessories, high-temperature equipment accessories, deep-sea detection equipment accessories, wear-resistant equipment accessories, corrosion-resistant equipment accessories, gas Drilling equipment, sports equipment, automobiles, motorcycles, computers, mobile phones and other high-pressure resistant, wear-resistant, corrosion-resistant fields have been widely used and popularized.
The cleaning technology of titanium alloy forgings has two aspects: one is the removal of oxide scale; the second is the removal of α shell. Rust can be removed by mechanical methods, such as sandblasting; or chemical methods, such as molten salt derusting. The choice of rust removal method depends on the size, complexity and cost of the part.
Sandblasting is an effective method to remove rust. It can remove rust from 0.13 to 0.76mm thick. 100 to 150 mesh zircon sand or steel sand can be used. The air pressure can reach 275Pa. Although sandblasting can be used for forgings of various sizes, it is mostly used for medium and large titanium alloy forgings. Sandblasting equipment can use drums, shot blasting or sandblasting devices equipped with abrasives. After sandblasting, pickling is required to remove the alpha shell.
Dissolved salt rust removal is another effective method for removing scale, and the alpha shell is also removed by acid pickling. First, the flow chart of solution salt removal and pickling, solution composition and related parameters are usually used. The racks used for dissolving salt to remove rust are generally made of wood, titanium or stainless steel to prevent the generation of electric potential between the workpiece and the rack, which may cause electrical erosion or arcing of the workpiece. Molten salt descaling is often used in small and medium-sized forgings. In the case of large-scale forgings, the operating system can be fully automated.
