Chromium-free passivation treatment process for aluminum alloy surface
An aluminum alloy surface, chromium-free passivation technology, applied in the field of aluminum alloys, can solve the problems of human body and natural environment hazards, hexavalent chromium compounds are highly toxic, and achieve excellent resistance to salt spray corrosion and increased surface contact angle. , the effect of accelerating the dissolution
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Embodiment 1
[0063] A chromium-free passivation treatment process for the surface of an aluminum alloy, comprising:
[0064] (1) Grinding:
[0065] The surface of the aluminum alloy workpiece is polished, and the silicon carbide sandpaper of 600#, 800#, and 1200# is used in turn to polish with water, and then polished on an automatic polishing machine, then cleaned, and dried to constant weight; when polishing, the particle size is used 1μm water-soluble diamond polishing paste for auxiliary polishing. The cleaning is to clean with acetone and distilled water respectively for 20 min in an ultrasonic cleaner.
[0066] (2) Tannic acid solution treatment:
[0067] Add the tannic acid solution into the vacuum reaction kettle, and then immerse the above-mentioned polished aluminum alloy workpiece in the tannic acid solution, then seal it, vacuumize it, adjust the temperature in the reaction kettle to 80°C, react for 40min, and then Take it out, wash it with clean water until it is neutral, a...
Embodiment 2
[0073] A chromium-free passivation treatment process for the surface of an aluminum alloy, comprising:
[0074] (1) Grinding:
[0075] The surface of the aluminum alloy workpiece is polished, and the silicon carbide sandpaper of 600#, 800#, and 1200# is used in turn to polish with water, and then polished on an automatic polishing machine, then cleaned, and dried to constant weight; when polishing, the particle size is used 1μm water-soluble diamond polishing paste for auxiliary polishing. The cleaning is to clean with acetone and distilled water respectively for 25 min in an ultrasonic cleaner.
[0076] (2) Tannic acid solution treatment:
[0077] Add the tannic acid solution into the vacuum reaction kettle, and then immerse the above-mentioned polished aluminum alloy workpiece in the tannic acid solution, then seal it, vacuumize it, adjust the temperature in the reaction kettle to 90°C, react for 50min, and then Take it out, wash it with clean water until it is neutral, a...
Embodiment 3
[0083] A chromium-free passivation treatment process for the surface of an aluminum alloy, comprising:
[0084] (1) Grinding:
[0085] The surface of the aluminum alloy workpiece is polished, and the silicon carbide sandpaper of 600#, 800#, and 1200# is used in turn to polish with water, and then polished on an automatic polishing machine, then cleaned, and dried to constant weight; when polishing, the particle size is used 1μm water-soluble diamond polishing paste for auxiliary polishing. The cleaning is to clean with acetone and distilled water respectively for 22 minutes in an ultrasonic cleaning machine.
[0086] (2) Tannic acid solution treatment:
[0087] Add the tannic acid solution into the vacuum reaction kettle, and then immerse the above-mentioned polished aluminum alloy workpiece in the tannic acid solution, then seal it, vacuumize it, adjust the temperature in the reaction kettle to 85°C, react for 45min, and then Take it out, wash it with clean water until it ...
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