The velar layer of appearance of aluminium alloy data chooses

We have nowadays so a few kinds of film, zincous oxidation film, film of small arc oxidation, zincous oxidation is compound film, organic polymer film, metallic film. I make zincous oxidation film a brief introduction, zincous oxidation film is the most commonly used, zincous oxidation processing is the outside processing technique that aluminium alloy often chooses. The film of oxidation of much pass positive pole that safeguard and decorating film of oxidation of the positive pole that use aluminium is 10um above normally, its hole rate is 11~13% normally, its are tectonic by poriferous layer (depend on the n that pass) with barrier layer (clingy at aluminous outside and paper-thin layer) two parts are formed, belong to film of oxidation of the condition that be not brilliant. Can electroanalysis chromatically and coloring, be necessary sealing of hole is handled in order to hold to the maintenance of oxidation film quality. Zincous oxidation film has normally zincous oxidation film and horniness positive pole oxidize film, its hardness is 300Hv and 500Hv respectively.

Film of small arc oxidation, small arc oxidation calls plasma small arc oxidation again, plasma pottery and porcelain is changed or electric spark discharge piles up skill, gu Mingsai is discussed is to be below tall extra voltage, the oxidation film that makes be not brilliant condition originally produces photograph and structural change below small arc action, generate the β α Al2O3 of crystallization condition and γ Al2O3. Characteristic of film of small arc oxidation is small hole rate (<4% ) , tall hardness (> Hv1000) with tall wearability. But cannot be resembled,normally positive pole oxidizes film in that way chromatically, and specific power consumption is very tall. To drop electric energy is expended, began without scintilla small arc oxidizes. Normally appearance of film of small arc oxidation has the loose layer of sure ply, before applying, ought to get rid of.

Zincous oxidation is compound film, compound film includes zincous oxidation film and electrophoresis lacquer film two, hold a zincous oxidation film and organic polymer concurrently normally film (choose acrylic colophony normally) two good qualities. Its hardness tall, wearability good, corrosion resistance is strong, paint film adheres to the gender is good, have the corrosion resistance with fine film of outside organic compound not merely, and have very admirable be able to bear or endure the filiform below film corrodes a function, build window of aluminium alloy door to use compound film extensively already now.

Film of organic polymer spray, build and decorate with aluminium and aluminium alloy film of organic polymer spray basically has pulverous spray film (choose epoxy resin or polyester colophony according to need) , film of spray of fluorine carbon lacquer, its color is abounded and the technology is brief. Have machine polymer to ensure the corrosion resistance that film leaves about the adherent sex of matrix aluminium alloy and ascensive film layer, need to undertake to aluminium and aluminium alloy finished product chromate chemistry changes processing before spray is handled normally, chemistry changes film very thin (also choose zincous oxidation film to do ground floor sometimes) , and outside organic polymer film is deeper (normally prep above 60um) . In view of 6 price chromic ion about the environment tremendous damage, should active development changes processing without chromium. The chemistry that do not have chromium changes processing to include alkyl of zirconium titanium department, organic silicon to wait, but the present chemistry that do not have chromium changes the technical function of processing and velar layer function,all handle as chromate.

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