Commonly used sand blasting or blasting method

Derusting surface shot blasting machine knowledge Encyclopedia: sand blasting or blasting method commonly used in sandblasting derusting is the use of compressed air to a certain size of sand by spray on the surface of the parts from rust, rust is not only fast, can also make preparations for the surface coating, spraying, electroplating process, surface sandblasting can achieve clean the surface roughness and requirements, so as to improve the binding force of the cover layer and parts
Sand blasting methods are commonly used for dry wet sandblasting, sandblasting, dust-free sandblasting and high-pressure water blasting. Dry sand dust, to environmental protection, health hazards; no wet dust, but the water will make the surface rust again. The method of prevention is to add 1% to 15% of the antirust agent (phosphoric acid, sodium carbonate, sodium nitrite, etc.) and emulsifier or soap water in water, so that the surface of the rust in a short period of time no longer, and then coated with the maintenance of primer (). Dust blasting is sand, sand blasting and sand collection in a closed system in a continuous cycle, so as not to dust flying. High pressure water blasting mainly for large blasting, such as hull, oil tank, oil tank, boiler water, often adding passivator and soap water.
Blasting or blasting
1, derusting quality
All to be coated with waterborne inorganic zinc rich coatings on steel surface, blasting or blasting must reach ISO8501-1 (GB8923-88) Sa2.5 level.
Local repair coating, steel surface must be polished to ISO8501-1 (GB8923-88) St3 level.
2, surface roughness requirements: surface roughness requirements in the control of 35 ~ 65 m range.
3, abrasive
In order to ensure the blasting or spray steel after surface reaches the cleanliness and surface roughness, the recommended size used angular or round shape for 0.3-0.8mm stainless steel sand.
The abrasive should be clean and dry, can not be organic contamination.
4, compressed air: sandblasting with compressed air, the pressure should not be less than 0.5MPa.

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