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7075 aluminum anodized treatment measures during coloring sealing
- 2017-07-14 09:00 -
Mingtai 7075 super-hard aluminum alloy, specifically for aerospace, transportation and other high-end technology with aluminum, is one of the hottest materials in the 21st century, known as the most hard light metal materials.

7075 aluminum sheet is a cold treatment forging alloy, high strength, high hardness, far better than soft steel. Is one of the most powerful commercial alloys, the general corrosion resistance, good mechanical properties and anode reaction.
7075 aluminum and aluminum anodized film has a large number of holes, the surface adsorption is very strong, hand touch with the feeling of sticky hand. In order to improve the anti-pollution and corrosion resistance of the oxide film, sealing is an indispensable step. 7075 aluminum plate anodized film sealing hole is mainly heat sealing hole and cold sealing two, at present our country basically use cold sealing hole. As the film thickness increases and the sealing quality increases. The consumption of cold sealant per ton of aluminum is increased from 0.8 to 1.2 kg to 1.5 to 2.0 kg. Nickel fluoride is the main component of the current cold sealing agent, so the quality of nickel fluoride determines the quality of cold sealant. Nickel fluoride, zinc, copper and other impurities, in the new with the bath is not obvious, but the production for some time, the sealing quality is difficult to guarantee.
The pH of the cold seal was previously considered to be 5.5 to 6.5, and should actually be determined according to the formulation characteristics of the cold sealant. The pH value of the new bath is generally 5.3 ~ 7.0 can be successful, but for the use of ammonium fluoride or ammonium bicarbonate to adjust the fluoride of the old tank, due to the impact of ammonium ions, pH should be controlled at 6.5 ~ 7.1 the best. At this point sealing speed, fluoride consumption less, do not appear "white" phenomenon. The ammonium ions in the sealed tank are less likely to form powder than sodium ions, but the sealing rate is slower. To ensure the quality of sealing, the operation of the main points are as follows:
(1) anodic oxidation temperature is generally less than 23 ℃, the temperature is too high, cold seal agent consumption, the surface "green."
(2) after anodic oxidation should be timely washing, stay in the oxidation tank will affect the subsequent sealing. Washing is not easy to cause dirty channeling pollution, increase the fluoride consumption of the sealing slot.
(3) off in the sealing slot in the aluminum and aluminum wire should be promptly removed, or will speed up the increase in pH and fluoride consumption.
(4) with fluoride fluoride fluoride sealing slot, each cubic meter through the 20t aluminum, should be inverted bottom of the first time.
(5) with fluoride hydrofluoric acid fluoride sealing slot, after adding should be 5 ~ 10min before production, preferably in the form of 10% dilute solution.
(6) In order to improve the quality of sealing and to speed up the drying rate, cold sealing, recommended 55 ± 5 ℃ hot water wash 10 ~ 15min, also known as cold sealing post-processing