Electrophoresis film-painting method

Abstract

The invention discloses an electrophoresis film-painting method. The electrophoresis film-painting method comprises the following steps of: (1) anodic oxidation: carrying out the anodic oxidation on metal to form an oxidation film on the surface of the metal; (2) hot washing: soaking the metal subjected to the anodic oxidation into a hot water tank to be subjected to the hot washing for 5-6 minutes, wherein pure water is contained in the hot water tank, and the water temperature is 50-75 DEG C; (3) water washing: soaking the metal after being subjected to the hot washing into a recovery tank to be subjected to the water washing for 1-2 minutes, wherein the pure water is contained in the recovery tank, and the pH value of the pure water is less than 7.5; (4) electrophoresis: soaking the metal after being subjected to the water washing into an electrophoresis tank to be subjected to the electrophoresis, wherein the pH value in the electrophoresis tank is 7.5-8; and (5) repeatedly soaking the metal after being subjected to the electrophoresis into the recovery tank to be subjected to water washing. By utilizing the technical scheme, according to the electrophoresis film-painting method disclosed by the invention, the process sequence is changed, and a section bar after being subjected to the hot washing is firstly cleaned and is then subjected to the electrophoresis, so that the watermark problem is solved.

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