Deficiencies of three surface treatment methods of aluminum profiles

1.Anodizing: oxidation film easy to mix impurities and turn yellow and the material is easy to stick together, so that the surface color uneven cause rainbow color and poor appearance of the aluminum profile and cold bed parts easy to form black or white spots. The temperature of the electrolyte is too high or the electrolytic time is too long will cause the aluminum profile surface white opaque powder. In the oxidation process, if the profile falls off, easy to cause short circuit. In alkali erosion, if the concentration of sulfuric acid is not well controlled, will make the surface of the profile less corrosion resistance, the surface of the oxide film is also prone to burn, white, A variety of appearance quality problems, such as blackness or dark color.

2, Electrophoresis coating: in electrophoresis coating, if not strictly in accordance with the requirements of the various processes to operate, such as baking time is too long, the tank fluid is contaminated, the composition of the tank fluid is not qualified, etc. , will cause the aluminum profile surface rough, foaming, pinholes or shrink holes, paint spot flow marks, gloss is not high, profile surface paint film is not uniform, Produce cracks and other surface defects.

3, Powder coating: if the raw material quality is not good, dust or impurities mixed in, will produce particles on the surface of the profile, compressed air is not clean, mixed with oil or water will also cause aluminum profile surface shrink defects, raw material syllable steaming, will affect the hardness of aluminum profile products, impact resistance, Anti-bending and other physical and chemical properties, but also cause the profile surface is not powder, color yellowing and other poor appearance.