Micro-arc oxidation ceramic membrane and preparation method thereof
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A micro-arc oxidation and ceramic film technology, applied in anodizing and other directions, can solve the problem of single color of ceramic film, and achieve the effect of increased density, good heat dissipation performance, and improved corrosion resistance
Inactive Publication Date: 2016-11-16
KA SHUI TECH HUIZHOU CO LTD
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[0006] The invention provides a micro-arc oxidation ceramic film and a preparation method thereof. By forming a layer of micro-arc oxidation ceramic film on the surface of a magnesium alloy, the corrosion resistance and heat dissipation performance of the magnesium alloy surface are improved and the problem of single color of the ceramic film is solved.
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Embodiment 1
[0027] Example 1: Preparation of Micro-arc Oxidation Ceramic Film with Strong Heat Dissipation and Corrosion Resistance
[0028] Step 1, preparation of micro-arc oxidation electrolyte
[0029] First, add 30g / L sodium silicate, 8g / L sodium phosphate and 5g / L sodium hydroxide into a stainless steel container and dissolve with deionized water. Then add 6g / L glycerin and 1g / L sodium tungstate as additives.
[0030] Step 2, micro-arc oxidation treatment
[0031] The sample used in the test is a commercial grade magnesium alloy AZ31B, and other magnesium alloys (such as AZ91D) with a magnesium content of more than 88% are also suitable for the present invention. The sample size is 30 mm × 30 mm × 1 mm. The samples were immersed in the solution described above for micro-arc oxidation treatment at a current density of 0.15 A / cm 2 , the pulse frequency is 1500Hz, and the duration is 720 seconds. After treatment, a ceramic layer with chemical and mechanical protection properties i...
Embodiment 2
[0038] Example 2: Preparation of a micro-arc oxidation ceramic film with a color number of PANTONE P 4-15U
[0039] Step 1, preparation of micro-arc oxidation electrolyte
[0040] First, add 25g / L sodium silicate, 10g / L sodium phosphate and 3g / L sodium hydroxide into a stainless steel container and dissolve with deionized water. Then add 5g / L glycerin and 1g / L sodium tungstate as additives.
[0041] Step 2, micro-arc oxidation treatment
[0042] The sample used in the test is a commercial grade magnesium alloy AZ31B, and other magnesium alloys (such as AZ91D) with a magnesium content of more than 88% are also suitable for the present invention. The sample size is 30 mm × 30 mm × 1 mm. The samples were immersed in the solution described above for micro-arc oxidation treatment at a current density of 0.1 A / cm 2 , the pulse frequency is 600Hz, and the duration is 240 seconds. After treatment, a ceramic layer with chemical and mechanical protection properties is formed on th...
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Abstract
The invention provides a micro-arc oxidation ceramic membrane and a preparation method thereof. The preparation method comprises the steps of micro-arc oxidation treatment and hole sealing treatment. After a magnesium alloy is subjected to micro-arc oxidation treatment, the ceramic membrane with high corrosion resistance and heat radiation performance is generated on the surface, hole sealing treatment is carried out through hole sealing liquid, the compactness of the ceramic membrane is enhanced, and the corrosion resistance of the ceramic membrane is further enhanced. The micro-arc oxidation ceramic membrane and the preparation method have the following beneficial effects that after the magnesium alloy is subjected to micro-arc oxidation treatment, and the ceramic membrane with high heat radiation performance is formed on the surface, so that the heat radiation efficiency of the magnesium alloy is improved; an additive containing glycerine and tungstate is added into a micro-arc oxidation electrolyte, components of the ceramic membrane are changed, the corrosion resistance of the ceramic membrane is enhanced, and therefore the corrosion resistance of the magnesium alloy is increased, and the service life is prolonged; and hole sealing treatment is carried out through the hole sealing liquid, the compactness of the ceramic membrane is improved, the corrosion resistance of the magnesium alloy is further improved, and meanwhile the problem that the colors of micro-arc oxidation ceramic membranes in the current market are not abundant is solved.
Description
technical field [0001] The invention relates to the field of micro-arc oxidation, in particular to a micro-arc oxidation ceramic film and a preparation method thereof. Background technique [0002] In recent years, due to its superior strength-to-weight ratio, good electromagnetic shielding and castability, magnesium alloys have been increasingly used in the casings of electronic products, such as notebooks, mobile phones, etc. Corrosion resistance, heat dissipation, anti-aging, and extended service life have put forward higher requirements. [0003] Micro-arc oxidation is currently one of the most promising and efficient surface treatment methods that can improve the corrosion resistance of magnesium alloys. It uses different environmentally friendly electrolytes to form a thick layer on the surface of magnesium alloys with excellent adhesion. The ceramic layer improves the corrosion resistance and service life of the magnesium alloy. [0004] At present, the appearance c...
Claims
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