Preparation method for titanium alloy TA2 surface high-solar absorptivity low-emissivity film layer

A technology of solar absorptivity and low emissivity, applied in surface reaction electrolytic coatings, coatings, electrolytic coatings, etc., can solve the problems of low solar absorptivity, low bonding force between the film and the substrate, and high emissivity. Simple process, excellent adhesion and thermal stability, easy to achieve results

Active Publication Date: 2015-11-11
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 alloy TA2 have low solar absorption rate, high self-emission rat

Method used

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  • Preparation method for titanium alloy TA2 surface high-solar absorptivity low-emissivity film layer

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Example Embodiment

[0022] Specific embodiment 1: This embodiment is a method for preparing a high solar absorptivity and low emissivity film on the surface of a titanium alloy TA2, which is completed in the following steps:

[0023] 1. Titanium alloy TA2 pretreatment: Use 240 mesh water matte paper and 1000 mesh water matte paper to polish the titanium alloy TA2 to obtain the titanium alloy TA2 with burrs and oxide layers removed; immerse the titanium alloy TA2 with burrs and oxide layers to be removed. HF and HNO 3 Use NaOH solution to remove the oil on the smooth surface of the titanium alloy TA2, clean it with distilled water, and finally dry it with a hair dryer to obtain the treated titanium alloy TA2;

[0024] The NaOH solution in step one is made by mixing NaOH and distilled water, and the mass ratio of the NaOH to the volume of distilled water is (8g-15g): 1L;

[0025] HF and HNO as described in step one 3 The mixed solution is composed of 40% hydrofluoric acid and 65% nitric acid by mass fract...

Example Embodiment

[0035] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the main film-forming agent in step 2 is sodium aluminate. The other steps are the same as in the first embodiment.

Example Embodiment

[0036] Specific embodiment three: this embodiment is different from specific embodiment one or two in that the auxiliary film forming agent in step two is one of trisodium phosphate, sodium hypophosphite, sodium hexametaphosphate and polyphosphoric acid Or a mixture of several of them. The other steps are the same as the first or second embodiment.

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Abstract

The invention relates to a preparation method for a titanium alloy TA2 surface ceramic film layer, in particular to a preparation method for a titanium alloy TA2 surface high-solar absorptivity low-emissivity film layer, and aims to solve the problems that an existing titanium alloy TA2 surface coating is low in solar absorptivity, high in self emissivity, and low in bonding force of a film layer and a base body. The preparation method comprises the steps that 1, pretreatment is carried out on titanium alloy TA2; 2, micro-arc oxidation is carried out to obtain a titanium alloy TA2 surface high-solar absorptivity low-emissivity film layer. The thickness of the prepared titanium alloy TA2 surface high-solar absorptivity low-emissivity film layer ranges from 0.3 micron to 1 micron, the roughness of the film layer ranges from 0.2 micron to 0.25 micron, solar absorptivity ranges from 0.82 to 0.9, and emissivity ranges from 0.08 to 0.13. The titanium alloy TA2 surface high-solar absorptivity low-emissivity film layer can be obtained through the preparation method.

Description

technical field [0001] The invention relates to a method for preparing a ceramic film layer on the surface of titanium alloy TA2. Background technique [0002] The industrial pure titanium commonly used in industry is TA2, because of its moderate corrosion resistance and comprehensive mechanical properties, low strength, good plasticity, easy processing, stamping, welding, cutting, good performance; in the atmosphere, sea water, wet chlorine gas It has good corrosion resistance in oxidizing, neutral and weakly reducing media, and its oxidation resistance is better than most austenitic stainless steels. Therefore, titanium alloy TA2 is widely used in industry and aerospace. [0003] The energy crisis has drawn people's attention to solar energy as a clean energy source, but the radiation energy density of the sun's radiation after it hits the earth is low, which brings great obstacles to the large-scale utilization of solar energy. Therefore, it is necessary to pass Some way...

Claims

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Application Information

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IPC IPC(8): C25D11/26
Inventor 姚忠平魏晗李东琦夏琦兴姜兆华
Owner HARBIN INST OF TECH
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