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Titanium alloy surface high temperature oxidation corrosion resistance coatings preparation method

A high-temperature oxidation-resistant and corrosion-resistant coating technology is applied in the field of preparation of oxidation-resistant coatings on the surface of titanium alloys. It can solve problems such as poor high-temperature oxygen resistance and corrosion resistance, inapplicability to complex parts shapes, and thermal mismatch of coating film bases. Achieve the effects of high bonding strength of film base, high oxidation resistance, and blocking oxidation failure

Inactive Publication Date: 2008-11-19
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] In order to solve the shortcomings of the existing preparation methods of anti-oxidation coatings on the surface of titanium alloys, such as high cost, thermal mismatch of the coating film base, poor high-temperature oxygen corrosion resistance and inapplicability to complex parts shapes, etc., the invention provides a titanium Preparation method of high temperature oxidation corrosion resistant coating on alloy surface

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  • Titanium alloy surface high temperature oxidation corrosion resistance coatings preparation method
  • Titanium alloy surface high temperature oxidation corrosion resistance coatings preparation method
  • Titanium alloy surface high temperature oxidation corrosion resistance coatings preparation method

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specific Embodiment approach 1

[0013] Embodiment 1: The method for preparing a high-temperature oxidation corrosion resistant coating on the surface of titanium alloy includes a degreasing step, an oxidation step, and a water washing step, and is characterized in that the specific process of the oxidation step is:

[0014] Step 1. Fix one end of the titanium alloy part to be processed on the fixture connected to the positive output end of the pulse power supply, then put the titanium alloy part into the electrolytic tank, and ensure that all the titanium alloy parts are immersed in the In the electrolyte solution in the electrolytic cell, the electrolyte solution is an alkaline solution;

[0015] Step 2. After fixing the stainless steel electrode on the fixture connected to the negative output terminal of the pulse power supply, immerse the stainless steel electrode in the electrolyte in the electrolytic tank, and ensure that the stainless steel electrode does not contact the titanium alloy parts;

[0016] ...

specific Embodiment approach 2

[0024] Specific embodiment two: The difference between this embodiment and the high-temperature oxidation corrosion resistant coating on the surface of titanium alloy described in specific embodiment one is that the base material is TC4 alloy, and the electrolyte adopts aluminate electrolyte (20g / L- NaAlO 2 , 1g / L-Na 3 PO 4 ), in step three, the output parameters of the pulse power supply are voltage 550V, frequency 600Hz, duty cycle 8%, and duration 10min.

[0025] The thickness of the dense ceramic layer on the surface of the TC4 alloy obtained in this embodiment is about 12 microns, such as figure 1 As shown, the coating consists of Al 2 TiO 5 and Al 2 Ti 7 o 15 Composition, the coating exhibits good anti-oxidation protection performance. The method for preparing the high-temperature oxidation-resistant coating on the surface of titanium alloy described in this embodiment is placed in a muffle furnace for constant temperature oxidation, the constant temperature is 7...

specific Embodiment approach 3

[0026] Specific embodiment three: the difference between this embodiment and the high-temperature oxidation-corrosion-resistant coating on the surface of titanium alloy described in specific embodiment one is that the substrate is a TC4 alloy, and the electrolyte adopts a silicate electrolyte (20g / L-Na 2 SiO 3 , 4g / L-KOH, 10g / L-(NaPO 3 ) 6 ), in step three, the output parameters of the pulse power supply are voltage 500V, frequency 600Hz, duty cycle 8%, and duration 10min.

[0027] The thickness of the dense ceramic layer on the surface of the TC4 alloy obtained in this embodiment is about 10 microns, such as image 3 As shown, the coating obtained after micro-arc oxidation is composed of anatase and rutile TiO 2 Composition, rutile as the main phase. The coating exhibits good oxidation resistance. The preparation method of the titanium alloy surface anti-oxidation corrosion coating described in this embodiment is placed in a muffle furnace for constant temperature oxidat...

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Abstract

The invention provides a method for preparing an anti high temperature oxidation corrosion coating on titanium alloy surface, relating to a process for preparing an anti oxidation coating on titanium alloy surface. The method resolves such defects existing in the prior method for preparing the anti oxidation coating on titanium alloy surface as the cost is high, the heat between the coating and the substrate is mismatched, the high temperature oxidation corrosion capability is poor and the method is inapplicable to the parts of complicated shape. The method of the invention comprises an oil removal step, an oxidation step and a water washing step, wherein the oxidation step is that one end of a titanium alloy part waiting for treatment is fixed on a clip connected with an anode output end of an impulsive power supply and used as an anode to be fully immersed in electrolyte of an electrolyte bath, and a stainless steel electrode is fixed on a clip connected with a cathode output end of the impulsive power supply and used as a cathode to be fully immersed in electrolyte of an electrolyte bath, which makes the impulsive power supply output the impulsive voltage with the voltage of between 400 and 600V, the frequency of between 400 and 800Hz and the duty ratio of between 4 to 20 percent for a period of time, and then stops. The method of the invention widens the application range of the titanium alloy under severe conditions such as high temperature oxidation, etc.

Description

technical field [0001] The invention relates to a process for preparing an anti-oxidation coating on the surface of a titanium alloy, which belongs to the spark-enhanced electrochemical coating process on the metal surface. Background technique [0002] The oxidation resistance of titanium alloys mainly depends on whether a protective oxide film can be formed on its surface under service conditions. When titanium alloys are used in high-temperature oxidizing environments, the surface is insufficient to form a continuous dense protective Al 2 o 3 Oxide film, forming porous TiO when oxidized 2 The main oxide film has poor oxidation resistance. The loose oxide layer and thicker oxygen-rich layer will damage the mechanical properties of the alloy, especially the plasticity and toughness, that is, the so-called oxygen embrittlement. Oxygen embrittlement is a key problem faced by high-temperature titanium alloys in practical use at 600 °C. Diffusion coating, vapor deposition ...

Claims

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Application Information

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IPC IPC(8): C25D11/26
Inventor 王亚明郭立新欧阳家虎贾德昌周玉
Owner HARBIN INST OF TECH
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