A kind of electrophoretic paint film method

Abstract

The invention discloses an electrophoretic paint film method, which comprises the following steps: (1) anodizing: anodizing the metal to form an oxide film on the metal surface; (2) scalding: immersing the anodized metal in a hot water tank for scalding 5 to 6 minutes, the hot water tank contains pure water, the water temperature is 50°C to 75°C; (3) Water washing: the metal after scalding is immersed in a recovery tank for washing and soaking for 1 to 2 minutes, the recovery tank contains pure water, pH The value is less than 7.5; (4) Electrophoresis: The washed metal is immersed in the electrophoresis tank for electrophoresis, and the pH value in the electrophoresis tank is 7.5-8; (5) Cleaning: The metal after electrophoresis is immersed in the recovery tank again for cleaning. By adopting the above-mentioned technical scheme, the present invention provides an electrophoretic paint film method, which changes the process sequence, cleans the scalded profiles first, and then electrophoresis, which solves the watermark problem.

Description

technical field [0001] The invention relates to an electrophoretic paint film method. Background technique [0002] When painting the surface of aluminum profiles, electrophoretic paint film is a commonly used process, which has the advantages of full, uniform, smooth and smooth coating, and the hardness, adhesion, corrosion resistance, impact performance and permeability of electrophoretic paint film Obviously superior to other coating processes, the electrophoretic paint film adopts water-soluble paint, uses water as the dissolution medium, saves a lot of organic solvents, greatly reduces air pollution and environmental hazards, is safe and hygienic, and avoids fire hazards at the same time. The efficiency is high, the paint loss is small, and the utilization rate of the paint can reach 90% to 95%. The electrophoresis steps in the prior art are: anodizing, scalding in a hot water tank, electrophoresis in an electrophoresis tank, cleaning in RO1 tank (first recovery tank),...

AI Technical Summary

Problems solved by technology

The reason is that the bath liquid in the electrophoresis tank is alkaline, and after the profile is scalded and directly enters the electrophoresis tank, due to the large difference in pH value, the mutual compatibility between water and paint becomes poor, and the paint concentration in the electrophoresis tank is high. The liquid is viscous, and the electrophoretic paint will cover the watermark inside, making it impossible to remove the watermark