Points to note when blasting garnet sand
Garnet sand needs to be tested for chloride indicators before sandblasting to reduce the generation of soluble salts as much as possible. During sandblasting, if the air humidity in the operating environment is high and the chloride content of the sandblasting abrasive is high, it is easy Soluble salt is produced. After garnet sand is blasted and coated in this environment, permeability blisters are prone to occur in the coating, and corrosion and oxidation are realized inside the workpiece. Therefore, we must carry out the chloride content before blasting the garnet sand. Indicator detection. In order to reduce the generation of soluble salt as much as possible, the following issues should be paid attention to during sandblasting:
(1) The humidity of the air when garnet sand is blasted.
When the relative humidity in the air reaches 85% or the surface temperature of the garnet blasted object is less than 3 degrees Celsius, the blasting operation should be stopped.
(2) The time interval between garnet sandblasting and painting.
Generally speaking, garnet sand should be painted immediately after blasting, so that the contact time between the blasted object and the air is short, and the dust and moisture content falling on the surface of the workpiece are small, and the best blasting effect can be maintained and achieved. Longer coating life. The best time interval between garnet sand blasting and painting is 4 hours. If it has not been painted for more than 6 hours, a secondary surface treatment must be carried out.
(3) Testing the moisture and chloride content of pomegranate grit.
Garnet sandblasting requires less than 1% of abrasive moisture and chloride content. If the content of both is too high, it is very easy to produce soluble salt.