Method for preparing green micro-arc oxidation ceramic film layer on surface of titanium alloy

A technology of micro-arc oxidation and ceramic film layer, which is applied in the direction of surface reaction electrolytic coating, coating, electrolytic coating, etc., can solve the problems of poor bonding force and unsatisfactory coloring effect, and achieve strong film/substrate bonding force and excellent Good wear and corrosion resistance and color stability

Inactive Publication Date: 2020-04-17
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the prior art, titanium alloy coloring technologies mainly include anodic oxidation, sol-gel, electrochemical coating, vacuum coating, etc., but the green film formed by these technologies in their respective working environments is relatively loose and has poor bonding force. Shading is not ideal

Method used

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  • Method for preparing green micro-arc oxidation ceramic film layer on surface of titanium alloy

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Experimental program
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Embodiment approach

[0025] (1) The titanium alloy workpiece to be processed is TC4 titanium alloy or TC10 titanium alloy. In practical applications, the titanium alloy workpiece to be processed may be: a disc with a diameter of 30 mm and a thickness of 3 mm.

[0026] (2) The process parameters used in the micro-arc oxidation treatment are: under constant current mode, the forward current density is 6-14A / dm 2 , The negative current density is 1~6A / dm 2 , The frequency is 400Hz-1000Hz, the positive duty ratio is 30%-70%, the negative duty ratio is 10%-30%, and the time is 5-20min. In practical applications, the electrolytic cell used in the micro-arc oxidation treatment is connected to an ultrasonic power supply, and is equipped with a stirring and cooling device.

[0027] Furthermore, the method for preparing green micro-arc oxidation ceramic film on the surface of titanium alloy provided by the present invention adopts specific process parameters for micro-arc oxidation treatment. Under the ac...

Embodiment 1

[0031] A method for preparing a green micro-arc oxidation ceramic film layer on the surface of a titanium alloy, comprising the steps of:

[0032] Step A. Polish the surface of the TC4 titanium alloy workpiece to be treated on 180#, 400#, 800# and 1200# silicon carbide sandpaper in sequence, and polish it with a polishing cloth to achieve a mirror effect, and then use deionized water and anhydrous water respectively Ethanol is used for ultrasonic cleaning and drying to obtain pretreated titanium alloy workpieces.

[0033] Step B, adopt 5g sodium polyacrylate (as dispersant), 40g nano-Cr 2 o 3 (as coloring agent) and deionized water are mixed with 400mL colloid, then described colloid is placed in the plastic tank and adopts the alumina ball of 6mm to carry out the grinding of 36 hours, then the colloid after grinding and the Na of 25g 2 SiO 3 , 5g of KOH, 5g of (NaPO 3 ) 6 Mix, and add deionized water to make the final volume of the solution 5L, stir evenly, so that the d...

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Abstract

The invention discloses a method for preparing a green micro-arc oxidation ceramic film layer on the surface of a titanium alloy, wherein the method comprises the steps: polishing the surface of a titanium alloy workpiece to be treated, cleaning and airing to obtain a pretreated titanium alloy workpiece; preparing colloid from a dispersing agent, nano Cr2O3 and deionized water; mixing the ground colloid with Na2SiO3, KOH and (NaPO3)6 to obtain a micro-arc oxidation electrolyte, wherein the concentration of the dispersing agent is 1-2 g / L, the concentration of the nano Cr2O3 is 6-12 g / L, the concentration of the Na2SiO3 is 4-10 g / L, the concentration of the KOH is 0.4-2 g / L, and the concentration of the (NaPO3)6 is 0.5-1.5 g / L; placing the pretreated titanium alloy workpiece in the micro-arc oxidation electrolyte, carrying out micro-arc oxidation treatment, and thus preparing the green micro-arc oxidation ceramic film layer on the surface of the titanium alloy. The formed film layer ismore compact, high in hardness, good in color retention, high in film / base binding force and quite ideal in film layer performance.

Description

technical field [0001] The invention relates to the technical field of metal coloring, in particular to a method for preparing a green micro-arc oxidation ceramic film on the surface of a titanium alloy. Background technique [0002] At present, in titanium and titanium alloy products treated by surface engineering technology, the green ceramic layer has unique optical functions and decorative properties, excellent corrosion resistance, and good mechanical properties, so it is widely used in aerospace, optical instruments, electronic devices, etc. The field has broad application prospects. [0003] The use of traditional soluble chromium salts (such as potassium dichromate) as colorants will cause harm to human health, so the use of soluble chromium salts will bring problems in waste disposal and wastewater treatment. Trivalent chromium oxide pigments have good chemical inertness and environmental friendliness, and are easier to handle in industrial practice, so they are wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/26
CPCC25D11/026C25D11/26
Inventor 陈飞李明泽杨旭宁吴敏宝蒋欣运苑宇骋
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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