A kind of preparation method of high solar energy absorption rate and high emissivity black matting film layer on the surface of titanium alloy

A high-emissivity, titanium alloy technology, applied in the field of preparation of ceramic film on the surface of titanium alloy, can solve the problems of low solar absorption rate, low emissivity, low bonding force between the film layer and the substrate, etc., and achieve simple process and high absorption efficiency, excellent binding force and thermal stability

Active Publication Date: 2017-10-03
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems that existing coatings on the surface of titanium alloys have low solar energy absorption rate, low self-emission rate, and low bonding force between the film layer and the substrate, and provide a titanium alloy surface with high solar energy absorption rate. Preparation method of emissivity black matting film layer

Method used

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  • A kind of preparation method of high solar energy absorption rate and high emissivity black matting film layer on the surface of titanium alloy
  • A kind of preparation method of high solar energy absorption rate and high emissivity black matting film layer on the surface of titanium alloy

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specific Embodiment approach 2

[0036] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the film-forming agent described in step two is trisodium phosphate, sodium metasilicate, sodium polyphosphate, sodium hexametaphosphate, sodium tungstate , disodium edetate and ammonium metavanadate. Others are the same as the first embodiment.

specific Embodiment approach 3

[0037] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the additive described in step 2 is one of ferrous sulfate, nickel acetate and cobalt acetate or a mixture of several of them. Other steps are the same as those in Embodiment 1 or 2.

specific Embodiment approach 4

[0038]Embodiment 4: The difference between this embodiment and Embodiments 1 to 3 is that in step 2, the processed titanium alloy is placed in the electrolyte in stainless steel, and the processed titanium alloy is connected to the positive pole of the power supply. As the anode, the stainless steel electrolytic cell is connected to the negative pole of the power supply as the cathode; the pulse micro-arc oxidation power supply is used for power supply, at a constant voltage of 350V, a power frequency of 500Hz, a duty cycle of 30%, and an electrolyte temperature of 25°C and React for 10 minutes under the condition that the pH value of the electrolyte is 12, and obtain a black matte film layer with high solar energy absorption rate and high emissivity on the surface of the titanium alloy. Other steps are the same as those in Embodiments 1 to 3.

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Abstract

The invention discloses a method for preparing a black extinction film layer with high solar energy absorption rate and high emissivity on the surface of a titanium alloy, which relates to a method for preparing a ceramic film layer on the surface of a titanium alloy. The purpose of the invention is to solve the problems of low solar energy absorption rate, low self-emission rate and low binding force between the film layer and the base body existing in the coating on the surface of the titanium alloy. Methods: 1. Titanium alloy pretreatment; 2. Micro-arc oxidation to obtain a black extinction film with high solar energy absorption rate and high emissivity on the titanium alloy surface. The thickness of the black extinction film with high solar energy absorption rate and high emissivity on the surface of the titanium alloy prepared by the invention is 20 μm to 30 μm, the roughness of the film layer is 0.5 μm to 3 μm, the solar absorption rate is 0.95 to 0.98, and the emissivity is 0.93 to 0.97 . The invention discloses a method for preparing a black extinction film layer with high solar energy absorption rate and high emissivity on the surface of a titanium alloy.

Description

technical field [0001] The invention relates to a method for preparing a ceramic film layer on the surface of a titanium alloy. Background technique [0002] With the development of science and technology, the requirements for metal materials in various fields are getting higher and higher, and the specific strength of titanium alloy is high. Titanium alloy TA7 (Ti-5Al-2.5Sn) has good thermoplasticity and can be welded in various forms. Good, the strength and plasticity of the welded joint can be equal to that of the base metal. It has good corrosion resistance and good thermal stability at high temperature. It can be used as structural parts for long-term work below 500 °C, and can be used as various die forgings. Good low-temperature performance: Titanium alloy TA7 with extremely low interstitial elements can still maintain its mechanical properties at low and ultra-low temperatures, and can maintain a certain degree of plasticity at -253°C. Therefore, titanium alloy TA7...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/26
Inventor 姜兆华魏晗刘冠杰姚忠平李东琦夏琦兴
Owner HARBIN INST OF TECH
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