Micro-arc oxidation treatment method of magnesium alloy
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A technology of micro-arc oxidation and treatment method, which is applied in the field of micro-arc oxidation treatment and micro-arc oxidation of magnesium alloys. It can solve the problems of easy corrosion and low magnesium alloys, and achieve the effect of not easy to fall off, improve corrosion resistance, and hard film Effect
Inactive Publication Date: 2011-01-12
DONGGUAN EONTEC CO LTD
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Problems solved by technology
Because the electrode potential of magnesium alloy is very low, it is very easy to be corroded
Although magnesium alloys can naturally form a basic carbonate film in the atmosphere, this natural oxide film is not enough to prevent corrosion in harsh environments. Therefore, reliable surface protection measures must be taken when magnesium alloys are used as structural materials and shells. Improving the Corrosion Resistance of Magnesium Alloys
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Embodiment 1
[0031] Step 1, pre-treatment, prepare a degreasing solution in a cleaning tank according to the degree of contamination on the surface of the product, the ratio of clear water to cleaning agent in the degreasing solution is 5:1, and the pH value is 12, and then put the magnesium alloy product for degreasing and cleaning;
[0032] Step 2, first configure the micro-arc oxidation treatment solution, the concentration of the micro-arc oxidation treatment solution is: Na 2 SiO 3 8g / L, KF 5g / L, KOH 10g / L.
[0033] Then place the magnesium alloy product in the tank where the micro-arc oxidation treatment solution has been prepared, and carry out the micro-arc oxidation treatment. The treatment temperature is 40°C, the pH value of the bath solution is 14, the conductivity is 20um / cm, the voltage is 350V, and the time is 5 minutes;
[0034] Step 3, the cleaning process, hang the magnesium alloy product in the cleaning room, and use the spray type to wash and clean for 1 minute;
[0...
Embodiment 2
[0037] Step 1, pre-treatment, according to the degree of contamination on the surface of the product, prepare a degreasing solution in the cleaning tank, the ratio of clear water and cleaning agent in the degreasing solution is 8:1, and the pH value is 14, and then put the magnesium alloy product for degreasing and cleaning;
[0038] Step 2, first configure the micro-arc oxidation treatment solution, the concentration of the micro-arc oxidation treatment solution is: Na 2 SiO 3 8g / L, KF6g / L, KOH 10g / L.
[0039] Then place the magnesium alloy product in the tank where the micro-arc oxidation treatment solution has been prepared, and carry out micro-arc oxidation treatment. The treatment temperature is 30°C, the pH value of the bath solution is 12, the conductivity is 15um / cm, the voltage is 400V, and the time is 8 minutes;
[0040] Step 3, the cleaning process, hang the magnesium alloy product in the cleaning room, and use the spray type to wash and clean for 1.5 minutes;
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Abstract
The invention discloses a micro-arc oxidation treatment method of a magnesium alloy, and the micro-arc oxidation treatment method comprises pretreatment, micro-arc oxidation, cleaning and post-treatment. The concentration of treatment fluid in the micro-arc oxidation process step in the micro-arc oxidation treatment method of the magnesium alloy is as follows: Na2SiO3 is 4-8g/L, KF is 5-10g/L, and KOH is 8-14g/L. The micro-arc oxidation treatment method comprises the steps of utilizing the principle of metal micro-arc oxidation, carrying out micro-arc oxidation treatment on the surface of the magnesium alloy, leading the surface of the magnesium alloy to grow out a ceramic structural film layer which is combined with a matrix in the micro-immersion gold way, isolating the contact between the surface of the magnesium alloy and atmosphere, carrying out micro-arc oxidation treatment, cleaning, post-treatment and drying on the magnesium alloy product within the stipulated range of parameters after the pre-treatment, generating an oxide film with the thickness of 5-10 mu m on the surface of the product, further spraying with an organic silicon coating and obtaining the film with the thickness of 35-50 mu m, and the micro-arc oxidation treatment method can improve the corrosion resistance of the magnesium alloy product to above 1000 hours and far exceed the requirements of national technical standard.
Description
technical field [0001] The invention belongs to the technical field of metal surface treatment, and relates to a micro-arc oxidation technology, in particular to a magnesium alloy micro-arc oxidation treatment method. Background technique [0002] Due to the characteristics of magnesium alloy materials, especially in those manufacturing fields that are important to reduce the weight of the structure itself, magnesium alloys are competitors or substitutes for engineering plastics, aluminum alloys and steel. At present, magnesium alloys are widely used in industrial sectors such as automobiles, aerospace, electronics, military and nuclear energy to meet the improvement needs of audio-visual equipment, computers and communication equipment, as well as the "lightweight" of vehicles and hand tools and other special technologies. Require. Since the electrode potential of magnesium alloy is very low, it is extremely easy to be corroded. Although magnesium alloys can naturally for...
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