How does surface of aluminium alloy profile become yellow how does processing avoid?

What electrophoresis lacquer oneself causes is yellow become presentative
Zincous electrophoresis lacquer basically is by acrylic acid colophony is mixed amine radical colophony forms. Electrophoresis aluminous profile is in roast process, colophony produces cross-linking reaction, make level off, transparent film. But because manufacturer of some electrophoresis lacquer produces of the technology immature, it is to drop cost applies the industrial chemicals with poorer quality probably, cause its next solidify program is narrower. Roast have a bit lack, paint film hardness cannot; roast in a way crossed a head, paint film can happen yellow change, to produce deal with the difficulty with be brought certain.
The electric conduction when oxidation is undesirable those who cause is yellow become presentative
Profile and electric lever contact are undesirable, the resistor that contact is in can soar, aluminous profile termination can give out heat, oxidation film has been generated accompany quickly broil bakes idea, appear even the pulverization of oxidation film. At this moment oxidation film is a little dirty, color appears yellow change, if produce into travel electrophoresis again,can appear very apparent fizzle outing becomes presentative. This kind fizzles out become presentative a few need only in the platoon usually, and go up at all be the termination that appears in profile. Accordingly, must adopt method to make sure profile and electric lever contact are outstanding.
What the bath before electrophoresis causes not completely is yellow become presentative
Oxidation film is alveolate, its are poriferous the program of shape chose oxidation film Kong Zhonghui remain is vitriolic. General, if bath is not complete,use the profile of electrophoresis, have very much can appear yellow become presentative. Yellow to this kind become presentative, what the acerbity root that considers as oxidation film Kong Li commonly and electrophoresis lacquer reaction make electrophoresis paint film happens next is yellow change, know to this kind, not dare agree without giving serious thought, because this kind fizzles out,changing is not paint film happening is yellow change, oxidize however of film yellow change. Normal oxidation film is clear, transparent, if more vitriolic root remains in oxidation film opening, below high temperature circumstance, oxidation film produces reaction with respect to meeting and vitriolic root, make clear, transparent oxidation film becomes dirty next, transparency drops; a tall transparency plus electrophoresis paint film, to tall reflex sex of the light, make this kind of defect gets distensible further next, what form place to say is yellow change. Accordingly, a few bath before electrophoresis are very crucial, need to assure bath water quality not merely, assure bath temperature and bath time even.
Oxidation chamfer fluid is fizzled out to become presentative by what nitric acid is polluted and cause
The better to arrive at function that divide ash, in counteract particular proportional nitric acid adds in groove this give no cause for more criticism, but if counteract hind bath control has been owed, nitric acid can be taken oxidation chamfer, when the nitric acid root in oxidation chamfer reachs certain consistency, can make certain impact to oxidation, what cause electrophoresis profile even is yellow change. In combustion process, the root meets the nitric acid in entering oxidation film opening to have quarter corrode effect to oxidation film, corrode the barrier layer of oxidation film, oxidize film opening becomes deep, alter then the program of velar opening.

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