Preparation technology of high-hardness color aluminum alloy oxidation layer
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A preparation process, a technology of aluminum alloy, applied in anodizing, coating, surface reaction electrolytic coating, etc., can solve the problems of low quality of the coloring layer of the anodized film, thin coloring layer, easy to fall off, etc., to promote the micro-arc Reasonable oxidation process, pretreatment process and activation process, uniform effect of ceramic layer
Inactive Publication Date: 2018-04-17
FOSHAN CITY GAOMING GAOSHENG ALUMINUM CO LTD
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Problems solved by technology
In order to obtain a beautiful appearance, eliminate or reduce reflection, and improve wear resistance and corrosion resistance, in many applications, it is necessary to prepare 6063 deformed aluminum alloys into oxide films with different tones such as black, blue, and yellow. Ordinary anodic oxidation Although the technology can realize film formation and coloring, the coloring layer is thin, especially the impurity elements such as silicon and magnesium in the 6063 aluminum alloy composition make the coloring layer quality of the anodic oxidation film low, the coloring layer is thin and easy to fall off, and it is easy to fall off under ultraviolet light. It is easy to fade and change color under the irradiation of sunlight, which is far behind the plasma electrolytic oxide film
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Embodiment 1
[0027] Concrete preparation steps are as follows:
[0028] S01, pre-processing:
[0029] The sample is placed in the circulating degreasing liquid, the degreasing liquid components and component content are sodium carbonate 18wt%, sodium phosphate 5.5wt%, surfactant 5wt%, sorbitan fatty acid ester 3.2wt% %, 0.56wt% of Sapindus saponin, the balance is water, the temperature of the degreasing liquid is 40°C during the treatment process, and the degreasing time is 4 minutes. The surfactant is an acyl glucosamide and an alkyl glucosyl ester with an HLB value of 8, and the mass ratio of the two is 1:1.2.
[0030] After the above treatment is completed, the sample is placed in the gap for alkali washing. The alkali washing solution used in the alkali washing step is 50wt% sodium hydroxide, 5wt% sodium alginate, and the balance is water. The alkali washing temperature is 58 ° C. The time is 4.5 minutes. After alkali cleaning, rinse the surface of the aluminum alloy with clean wate...
Embodiment 2
[0036] In this embodiment, other conditions are the same as in Embodiment 1, and 0.3 g / L of gum arabic is added to the electrolytic solution of S03 to make the reaction process of the secondary electrolysis more stable.
[0037] Finally, a blue-green oxide film with an average thickness of 150 μm was prepared.
Embodiment 3
[0039] Other conditions in this example are the same as those in Example 1. 0.002 g / L of sodium metavanadate was added to the S03 electrolyte, and finally a dark blue-green oxide film with an average thickness of 155 μm was prepared.
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Abstract
The invention discloses a preparation technology of a high-hardness color aluminum alloy oxidation layer. The preparation technology comprises the steps that S01, pretreatment is conducted, specifically, 6063 aluminum alloy is subjected to degreasing, alkaline cleaning, neutralizing and water cleaning; S02, active oxidation is conducted, specifically, the aluminum alloy treated through the step S01 is put into active oxidation liquid to be subjected to electrolysis active oxidation; and S03, secondary electrolysis treatment is conducted, specifically, the pretreated aluminum alloy is subjectedto electrolytic oxidation in electrolyte which comprises 6-8 g / L of sodium silicate, 12-15 g / L of citric acid, 1.5-1.8 g / L of sodium tungstate, 0.2-0.3 g / L of EDTA, 0.6-0.7 g / L of ammonium phosphotungstate and the balance water, the voltage is 280-285 V, oxidation treatment lasts for 30-35 min, and a blue-green oxidation film which is 150-155 [mu]m thick is prepared. According to the preparationtechnology, the electrolysis technology of the preparation technology conducts adaptive configuration on the pretreatment technology and the active technology, so that the pretreatment technology andthe active technology are more reasonable, micro-arc oxidation is facilitated, and a ceramic layer generated through electrolysis is uniform, compact, abrasion resistant and unfading.
Description
technical field [0001] The invention belongs to the aluminum alloy surface processing technology, and in particular relates to a preparation process of a high-hardness colored aluminum alloy oxide layer. Background technique [0002] Aluminum alloy surface color plasma electrolytic oxidation (Plasma Electrolytic Oxidation), also known as Microarc Discharge Oxidation or Microarc Oxidation, is through the combination of electrolyte and corresponding electrical parameters, on the surface of aluminum alloy Relying on the instantaneous high temperature and high pressure generated by arc discharge, the surface treatment technology grows a ceramic film layer mainly composed of aluminum alloy oxide. Plasma electrolytic oxidation technology can be used to grow and produce oxide ceramic film with good wear resistance and corrosion resistance in situ on the surface of aluminum alloy. The bonding force between the ceramic film and the aluminum alloy substrate is strong, the film thickne...
Claims
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