The commonly used methods of sandblasting rust removal include dry sandblasting, wet sandblasting, dust-free sandblasting and high-pressure water sandblasting. Dry sandblasting has dust, which is harmful to environmental protection and health; Although there is no dust in wet method, moisture will make the surface rust again. The way to prevent it is to add 1% ~ 15% antirust agent (trisodium phosphate, sodium carbonate, sodium nitrite, etc. ) and emulsifier or soapy water into the water, so that the surface will not rust in a short time, and then coated with maintenance primer. Dust-free sand blasting is a continuous cycle of sand addition, sand blasting and sand collection and recycling in a closed system to avoid dust flying. High-pressure water sandblasting is mainly used for large-scale rust removal of hull, oil tank, oil tank, boiler and so on. Passivators and soapy water are often added to water.
Sand blasting and rust removal quartz sand is suitable for sanding. Because quartz sand has strong hardness, it is used for grinding and rust removal, as shown below:
1. Remove the scale and residual salt after heat treatment, and all kinds of rare metal plates after hot rolling. Liquid sandblasting can also be used to remove scale and spot stains, prepare for cold rolling and improve the surface quality of plates.
2, remove the tiny burr of machining.
3, clean up dirt and rust
4. Prepare for other surface treatment processes.
Before electroplating parts, liquid sandblasting pretreatment is adopted, and the electroplating layer has strong bonding force. This is especially obvious for hard chromium. For example, the engine piston ring is chrome plated, and the silk idler of the textile machine is chrome plated.
For paint parts and spray parts, the surface energy after liquid sandblasting before spraying can increase the adhesion of the coating. The surface of the bonded part is treated by liquid sandblasting, and the bonding quality is good and firm.
5. Lighting processing
Liquid sandblasting (shot blasting) as a light decoration treatment method has outstanding effect. Especially for the polishing of parts with complex surfaces, such as impeller engine blades and various mold surfaces, such as currency, incense coins, commemorative coins, etc., any other method can not be compared. It is the most economical method to polish ceramics and diamonds by liquid sand blasting, such as polishing the friction wheel of chemical fiber textile machinery.
Quartz sand specifications: quartz sand granularity is 0.5- 1.0mm, main data specific gravity is 3.6, and bulk density is1.8-2t/m3;
Grain size of quartz sand 1-2mm, the main data specific gravity is 3.6, and the bulk density1.8-2t/m3;
The main data of 2-4mm quartz sand particle size show that the specific gravity is 3.6 and the bulk density is 1.8-2t/m3.