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Waste-water-discharge-free aluminum alloy organic passivation and inorganic chromizing treatment system and paint spraying process
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A processing system, aluminum alloy technology, applied in the direction of metal material coating process, pretreatment surface, coating, etc., can solve problems such as the decline of the adhesion of chromed film, achieve good resistance to salt spray corrosion, and solve the aging of bath liquid Effect
Pending Publication Date: 2021-10-08
FOSHAN SANSHUI XIONGYING INNOVATION CENT FOR ALUMINUM SURFACE TECH
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[0003] The improved chromizing treatment process of aluminum materials without sewage and waste slag discharge in the prior art, because there is no water washing after chromizing, after the aluminum material is dried, the surface hangs ash, and there is no film-forming component that is an organic acid aluminum salt Free adsorption on the surface of the aluminum material, resulting in a decrease in the adhesion of the chromium film compared to the traditional process
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Embodiment 1
[0160] Get the polyacrylic acid PAA described in the table, and according to the concentration of PAA in Table 2 is 160ml / L, 80ml / L, 40ml / L, 20ml / L, 10ml / L, 5ml / L, 2.5ml / L and 1.25 ml / L, the corresponding pH values are 1.45, 1.70, 2.10, 2.45, 3.05, 3.66, 4.07 and 4.68, and 8 test tanks are set up respectively. Take 8 standard testing aluminum plates of 15×7.5×0.1cm and number them, soak each standard testing aluminum plate with 98% alcohol for degreasing and dedusting for 4 minutes; take it out and dry it for 10 minutes, put it in an oven at 110°C for 15 minutes, weigh it, and record each standard Detect the original weight of the aluminum plate; then put it into the above-mentioned baths with different PAA concentrations, soak it completely, react for 4 minutes, take it out and dry it for 10 minutes, put it in an oven at 110°C for 15 minutes, weigh it, and record the weight after the reaction treatment. Each standard detects the weight of the aluminum plate.
[0161] The w...
Embodiment 2
[0172]Get the polyacrylic acid shown in table 1, set up 1#-8# experimental groove by the PAA concentration in above-mentioned table 2, set up the prior art of comparing lower limit 9# washing plate (PAA groove concentration is 0ml / L) and upper limit The 10# tank chromized plate treated by the advanced chromizing process, the aluminum plate is tested with the standard of 15×7.5×0.1cm, soaked for 4 minutes, taken out and dried for 10 minutes, and dried at 110°C for 15 minutes, and the above-mentioned experiments and comparison standards are used to test the aluminum plate According to the conventional process, the fluorocarbon paint that is easy to crack the film is sprayed, and it is cured and leveled at 200 ° C for 15 minutes; the aluminum plate is tested according to various standards after painting, according to GB / T5237.4-2017 "Aluminum Alloy Building Aluminum Part 4: Powder Spraying Profiles" The test standard tests cupping, impact, boiling, and drawing. The physical pictur...
Embodiment 3
[0181] according to figure 1 As shown, prepare the aluminum with seven functional tanks such as the first pre-washing tank, the second pre-washing tank, the trickle tank, the degreasing tank, the first chroming tank, the second chroming tank and the third chroming tank. Alloy chromizing production line.
[0182] The hydrofluoric acid and polyacrylic acid in Table 1 are used to compound additives according to the volume mixing ratio of PAA:hydrofluoric acid=95:5, and are used to prepare degreasing agent and chromizing agent.
[0183] Referring to the experimental results in Table 2, design management indicators, as shown in Table 4 below.
[0184] Table 4 Simulation experiment bath liquid control index of embodiment three
[0185]
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Abstract
The invention discloses a waste-water-discharge-free aluminum alloy organic passivation and inorganic chromizing treatment system and a paint spraying process. The waste-water-discharge-free aluminum alloy organic passivation and inorganic chromizing treatment system comprises a first pre-washing tank, a dripping tank, an oil removing tank, a first chromizing tank and a second chromizing tank; an oil removing agent contained in tank liquid of the oil removing tank comprises polyacrylic acid and hydrofluoric acid, and the pH value of the tank liquid of the oil removing tank is 2.0-2.5; chromizing agents contained in tank liquid of the first chromizing tank and the second chromizing tank both comprise polyacrylic acid, hydrofluoric acid and chromic anhydride, and the pH values of the tank liquid of the first chromizing tank and the second chromizing tank are 2.0-2.5 and 2.5-3.0 respectively; and the aluminum alloy subjected to chromizing treatment and before paint spraying does not need to be subjected to water washing treatment. The whole treatment process does not need drainage and deslagging, and is more environment-friendly and water-saving; and a formed organic passivated inorganic chromized composite film is bonded with an aluminum substrate and a paint spraying coating into a whole through chemical bonds, the paint spraying coating has ultra-high adhesive force, and the composite film has ultra-high corrosion resistance and self-repairing capacity.
Description
technical field [0001] The invention relates to a non-wastewaterdischarge aluminum alloy organic passivation inorganic chromization treatment system and a painting process, belonging to the field of aluminum alloy processing. Background technique [0002] In the chemical conversion film of the prior art, hexavalent chromium is retained in the structure of the chromium film of the traditional process, so it has the best corrosion resistance and has the function of "self-healing". Other chemical conversion films of the prior art The anti-corrosion performance is still not up to the salt spray corrosion resistance level of the chromized film of the traditional process. [0003] The improved chromizing treatment process of aluminum materials without sewage and waste slag discharge in the prior art, because there is no water washing after chromizing, after the aluminum material is dried, the surface hangs ash, and there is no film-forming component that is an organic acid alumin...
Claims
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Application Information
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