Technique method of coating powder on hot-rolled plate no-cavity vehicle parts

Abstract

Disclosed is a technological method of powder coating of non-cavity automobile parts of hot rolled plates, comprising the process steps: 1. surface oil removing of rolled plate parts; 2. blow drying of water; 3. shot (or sand) blasting or throwing; 4. blowing-off of shot or sand; 5. electrostatic powder coating; 6. powder coating solidification; and 7. cooling. The invention brings forward a novel process for immediately implementing the powder coating to the hot rolled plate automobile parts with non-cavity structures after using an air supply to clean the surface of a workpiece after the rust removing through shot (sand) blasting, aiming at the characteristics of the surface state after the shot (sand) blasting of the hot rolled plate automobile parts and the adoption of powder coating, and reasonably controls the thickness of powder coating according to the anticorrosion quality requirements and the surface roughness of the coated workpiece, thereby simplifying the pre-painting surface treatment process, reducing the coating equipment investment, energy consumption and discharge of waste water and waste residues, meanwhile solving the problem that poor conductivity at the welding seams of the parts influences the coating quality.

Description

technical field [0001] The invention relates to the technical field of the powder coating process of metal hot-rolled plates, in particular to a process method for powder coating of hot-rolled plates without cavities for auto parts. Background technique [0002] Due to the continuous improvement of users' requirements for automotive coatings, especially the general requirement for the salt spray resistance of hot-rolled plate parts coatings to reach more than 504h, the coating process of spraying or dipping paint used in the past has made the product coating The quality cannot meet the anti-corrosion requirements, so the use of powder coating has become the development trend of hot-rolled plate parts coating. [0003] Generally, hot-rolled sheets should be shot blasted (sand) or pickled to remove the oxide layer and rust on the surface before painting, and then go through "degreasing→water washing→surface adjustment→phosphating→water washing→water washing→water drying " or ...

AI Technical Summary

Problems solved by technology

[0002] Due to the continuous improvement of users' requirements for automotive coatings, especially the general requirement for the salt spray resistance of hot-rolled plate parts coatings to reach more than 504 hours, the coating process of spraying or dipping paint used in the past has made the product coating The quality cannot meet the anti-corrosion requirements, so powder coating has become the development trend of hot-rolled plate parts coating

[0003] Generally, hot-rolled sheets should be shot blasted (sand) or pickled to remove the oxide layer and rust on the surface before painting, and then go through "degreasing→water washing→surface adjustment→phosphating→water washing→water washing→water drying " or " degreasing → water washing → antirust water washing → water drying" before powder coating can be carried out, so there is a lot of waste water and waste slag discharged during the coating process, and at the same time there are still some welds in parts Poor adhesion of the paint film, prone to early rust