Preparation of metallic surfaces for painting
Updated: Feb 2, 2022
The efficiency and durability of the painting depend a lot on the preparation of the surface to be protected.
It is extremely important that the surface is well cleaned, free of any contaminants such as oil, grease, solder protection, rust, dirt, moisture, and lamination peel so that it can promote adhesion between it and the paint to be applied.
The surface to be painted must also be free of burrs and weld spatter. There are several ways to obtain a clean surface, Examples: chemical processes, brushing, sanding, hydro blasting, water blasting, sandblasting, etc.
We will approach sandblasting, which is a process capable of removing impurities such as lamination peel, rust, old paints, in some cases it can remove burrs and poorly adhered weld spatter.
Blasting does not remove impurities such as oil and grease, and the surface to be blasted must be free of this type of contaminant. In blasting wheel machines this type of contaminant causes fire in the equipment.
The great advantage of sandblasting in relation to other processes is that it significantly increases the contact area of the part surface with the paint, promoting better adhesion.
See how the part changes as it goes through the sandblasting process:
Note in the images above that after the piece goes through the sandblasting process, some juices are formed. This porosity that forms after the piece is blasted significantly increases the adhesion of the paint to the surface.
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