【China Aluminum Industry Network】 1. The oxide film is colorless or milky white. The water oxide film is γ diasporite alumina. Its structure is fine. The pH is between 3.5 and 9. The film is very stable and can be used as the bottom layer of paint. The superheated steam exceeding 100°C is advantageous for the composition of the membrane, and the practical technique is to treat the pure water in 75120°C for several minutes. To increase the film thickness, a porous oxide film can be obtained by adding ammonia or triethanolamine to pure water. When the aluminum alloy is immersed in boiling water, the aluminum's natural oxide film will continuously thicken, reaching 0.7 to 2 μm at the end. The color of the oxide film for increasing ammonia treatment is white and the color is uniform. The increase in the amount of ammonia is 0.3% to 0.5%.

2. Zirconium Salt Oxidation The use of zirconium-containing solution instead of chromate for pretreatment of aluminum-based exteriors has been well accepted by everyone. It is particularly suitable for the chemical conversion and film treatment of aluminum alloy parts prior to coating, which can increase the coating and matrix. Contact power, improve corrosion resistance, while the oxide film itself also has a certain ability to prevent corrosion.

3. Titanium Salt Oxidation The properties of titanium and chromium are very similar and do not corrode in almost any natural environment. Its excellent corrosion resistance stems from the successively formed, oxided, and maintenance-oriented oxide film on its appearance. Titanium's high reactivity and strong affinity with oxygen make its metal surface exposed to air or tidal temperature environment immediately constitute an oxide film. In fact, as if the chromate chemical oxide film is the same, only trace amounts of oxygen or water (moisture) exist in the environment. Due to the strong affinity between titanium and oxygen, the damaged titanium oxide film can immediately correct itself.

4. Rare earth metal salt oxidation method The rare earth metal salt chemical oxide film can replace the chromate chemical oxide film in the future. The data can be selected by the impregnation method. The treatment solution usually requires heating to generate the maintenance layer on the basic metal surface. Its corrosion resistance is dependent on the appearance of the metal to constitute the worship of rare earth oxidation. At that time, the rare earth aluminum alloy disposal technology usually used the treatment method of a mixed solution composed of a rare earth metal salt, an oxidant, a film-forming accelerator, and a film-forming agent. Rare-earth salts mainly refer to cerium salts such as CeCl3, Ce(NO3)3, Ce(SO4)2, (NH4)2Ce(NO3)6, etc., and film-forming accelerators include NaOH, HF, SrCl2, (NH4)2ZrF, etc. H2O2, KMnO4, (NH4)2S2O8, etc. The treatment technology without oxidizing agent in the disposal liquid is rare earth bohmite layer technology. This technique consists of forming the bohmite layer of aluminum alloy with hot water on its outer surface, and then dipping it into the rare earth salt solution to form the bohmite layer containing rare earth. The feature of this technology is that it is not required to use H2O2, KMnO4 and other strong oxidants to shorten the treatment time, but the treatment temperature is higher.

5. Permanganate Oxidation In general, permanganate is not only an excellent corrosion inhibitor for aluminum and alloys, but also accelerates corrosion. However, aluminum and its alloys in the KMnO4 solution can be treated as an excellent protective film. The technology includes: successively immersing in sodium bromate, distilled water, Al(NO3)3-LiNO3 solution and KMnO4 solution, and the composition of the obtained film is Al2O3?MnO2. If K2SiO3 solution is used to close the pores of the oxide film, the effect is even better. The protection of the KMnO4 oxide film is approximately 70% of that of the chromate film (in the same period as the salt spray test). For pure aluminum and aluminum alloys not containing copper, zinc, or iron, disposing it in an aqueous solution of potassium permanganate for 1 min can form a uniform yellow film near the chromate oxide film. For aluminum alloys with high corrosion propensity, in order to obtain a thicker protective film, it should be disposed of in boiling water or steam to constitute an oxidative worship, and then the film should be closed again two or three times. Once in the aluminum salt is closed, once in the KMnO4 solution is closed, so that the oxide film function can be compared with the chromate film, on the aluminum alloy with high copper, and not coated, for better protection The membrane can be treated with a 95~100°C potassium silicate solution for 1.5 minutes. Compared with the chromate film, the greater advantage of this membrane is that the dry temperature exceeds 65°C and long-term storage will not degrade its protection. Sex. The protective function of potassium permanganate oxide film and chromate oxide film on the silk (fiber) corrosion under the paint film is completely the same.

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