Hard anode oxidation method for aluminum and aluminum alloy
A hard anodizing, aluminum alloy technology, applied in electrolytic coatings, surface reaction electrolytic coatings, coatings, etc., can solve problems affecting product quality and other issues, achieve high yield, high hardness, and good promotion and application value.
Inactive Publication Date: 2013-01-30
河南平原光电有限公司
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Problems solved by technology
[0002] The factory has been using sulfuric acid and oxalic acid hard anodizing processes for aluminum and aluminum alloys for many years. Due to the low hardness of the sulfuric acid process, the ablation rate of the oxalic acid parts is high, as high as 12%, which has always affected the improvement of product quality.
Method used
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Embodiment 1
[0031] Example 1: Turn on the tank liquid cooling and stirring device, lower the tank temperature to about 0°C, lower the hanger with an appropriate amount of aluminum and aluminum alloy parts into the tank, conduct electricity, and turn on the power supply according to the calculated minimum current, every 3~ Adjust the current once every 5 minutes, adjust it 5-6 times to the specified value, and keep the current constant until the oxidation ends.
[0032] For the process flow of hard anodizing of aluminum and aluminum alloy, see image 3 , and its flow sequence is:
[0033] Ultrasonic degreasing→nitric acid light→upper hanger→lower tank→pulse power supply or constant current power supply→flowing cold water washing→hot water scalding→drying→delivery inspection→packing and packing.
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Abstract
The present invention discloses a hard anode oxidation method for aluminum and an aluminum alloy. According to the method, lactic acid, citric acid and an anthracene-containing self-made ??additive are adopted as an electrolyte, or only an anthracene-containing self-made ??additive is adopted as an electrolyte; installation suspension manners of the aluminum part and the aluminum alloy part during an electrolysis process are improved, and different installation suspension manners are adopted for the parts with different shapes; and the number of power feeding during the electrolysis process is increased. The oxidation film obtained by using the method has characteristics of uniform appearance and color range from gray black to black, provides advantages of high hardness, good wear resistance and good corrosion resistance compared with the ordinary sulfuric acid anode oxidation film, and further has a good technical effect.
Description
technical field [0001] The invention relates to an aluminum and aluminum alloy hard anodic oxidation method, which belongs to the fields of organic compound synthesis and constant current electrochemistry. Background technique [0002] The factory has been using sulfuric acid and oxalic acid hard anodizing processes for aluminum and aluminum alloys for many years. Due to the low hardness of the sulfuric acid process, and the high ablation rate of oxalic acid parts, as high as 12%, it has always affected the improvement of product quality. Contents of the invention [0003] In order to overcome the defects existing in the prior art, the present invention provides a method for hard anodizing of aluminum and aluminum alloys, and its technical scheme is specifically as follows: [0004] A mixed solution of lactic acid, citric acid and an anthracene-containing self-made additive is used as the electrolyte, or only an anthracene-containing self-made additive is used as the e...
Claims
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IPC IPC(8): C25D11/10
Inventor 任清罗中矿刘书强杨长玉冯继红薛新华
Owner 河南平原光电有限公司
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