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The principle and grade requirements of shot blasting machines sandblasting and rust removal

Rust removal is the use of compressed air to blast a certain size of grit on the rusted surface  through a sandblast gun. It not only removes rust quickly, but also prepares the surface for painting, spraying, electroplating and other processes. The surface after sandblasting is clean  with a certain degree of roughness, it improves the bonding force between the cover layer and the part.
The commonly used methods for sandblasting and rust removal include: dry sandblasting, wet sandblasting, dust-free sandblasting and high-pressure water sandblasting.
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Dry sandblasting is very dusty, which is harmful to environment and people’s health;
Although the wet method has no dust, moisture will make the surface rust again.The way to prevent it is to add 1% to 15% of rust inhibitors (trisodium phosphate, sodium carbonate, sodium nitrite, etc.) and emulsifiers or soapy water in the water to make the surface no longer rust in a short period of time, and then apply maintenance primer.
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1. Requirement for rust removal quality level
①All steel surfaces to be coated with water-based inorganic zinc-rich coatings must be shot blasted or sandblasted to meet the requirements of ISO8501-1 (GB8923-88) Sa2.5.
②When repairing the coating locally, the steel surface must be polished to IS08501-1 (GB8923-88) St3 level.
2. Surface roughness requirements: the surface roughness requirements should be controlled within the range of 35 ~ 65μm.
3. Abrasive
In order to ensure that the steel surface reaches the required cleanliness and surface roughness after blasting, it is recommended to use angular or bead-shaped stainless steel abrasive with a grain size of 0.3-0.8 mm.
 
As a integrated surface treatment service provider, Zibo TAA Metal can provide customers with various kinds of blasting abrasives, shot blasting machines and accessories,sandblasting tools etc.
 
Abrasives:steel shot,steel grit,bearing steel grit, carbon steel cut wire,stainless steel cut wire,stainless steel grit, sponge media,garnet, copper/zinc/aluminum cut wire etc.
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Shot blasting machine: Hanger type shot blast machine/Roller conveyor blast machine/Rotary table shot blast machine/Mesh belt shot blast machine/Drum type shot blast machine etc.

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Post time: Jan-08-2022