Aluminum alloy profiles are honeycomb shaped, and the reasonable layout of porous structure determines the residual hydrochloric acid in oxide film holes. Usually, for the principle of electrophoresis of industrial aluminum aluminum profile if the water cleaning is not thorough, it is very possible to yellowing phenomenon. Related to this kind of yellowing phenomenon, usually think is oxidation film hole in the acid root and reflected from the swimming paint then electrophoresis paint film yellowing, about this kind of understanding, do not agree, because this kind of yellowing is not the paint layer produced yellowing, but oxidation film yellowing. All normal oxide film is clear and transparent. If there is more residual sulfate in the oxide film hole, the oxide film will react with sulfate at high temperature, and then the clear and transparent oxide film is more and more cloudy, and the transmittance is reduced. Together with the electrophoretic paint film of high light transmittance, high reflection of the light source, then make this kind of defect to obtain further expansion, often said yellow. Therefore, several water cleaning before the principle of electrophoresis of aluminum profile processing manufacturers is very important, not only to ensure that water cleaning water, but also to ensure that water cleaning temperature and water at all times.

Bath oxidation by sodium cyanide pollution of the environment and cause yellowing phenomenon in order to reach good dust removal effect, in the slot in the ascension of sodium cyanide this necessarily justifiably, but if the water to clean after manipulation owe good, sodium cyanide will be sent to the oxidation groove, the nitrate ion in the oxidation tank arrived at the inevitable density, the harm of oxidation of inevitable, And lead to yellowing of electrophoretic profiles. In the whole process of oxidation, nitrate ions into the oxide film hole will have ion injection effect on the oxide film, etching the barrier layer of the oxide film, so that the oxide film hole becomes deeper, so as to modify the reasonable layout of the film hole of the price of industrial aluminum profile.

Why do aluminum profile manufacturers not only ensure that water cleaning water, but also to ensure that water cleaning temperature and water washing at all times