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Titanium alloy black anodic oxidation method capable of reducing oxidation film layer stress

A technology of anodizing and oxide film layer, applied in the direction of coating, surface reaction electrolytic coating, electrolytic coating, etc., can solve the problems of high stress of the oxide layer, easy to fall off and service life, achieve good stray light elimination, improve the use of Longevity, the effect of eliminating film peeling

Active Publication Date: 2009-06-17
CHANGCHUN UP OPTOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of large stress, easy to fall off and short service life of the oxide layer obtained by the current titanium alloy black anodizing process, and propose an improved technology for titanium alloy black anodizing that can reduce the stress of the oxide film layer. method to improve the stability of the oxide film on the surface of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The titanium alloy TC4 specimen with a size of 200×150×15 is subjected to black anodic oxidation matting treatment according to the following steps.

[0015] a. Alkaline chemical surface degreasing.

[0016] The degreasing solution is an alkaline aqueous solution containing 30-50 grams of sodium hydroxide, 30-50 grams of sodium carbonate, 15-30 grams of sodium phosphate, 3-5 grams of sodium silicate, and 1-2 grams of OP emulsifier per liter of water; The temperature is 70-80°C; the workpiece is put into the solution until it is 100% wetted by clean water after being taken out and cleaned.

[0017] b. Surface chemical micro-etching treatment.

[0018] After the aforementioned degreasing and cleaning, immerse in the micro-etching treatment solution at 45-50°C for 30 minutes, take it out and clean it;

[0019] The components of the micro-etching treatment solution are: 100 g of ammonium sulfate / water L, 80 g of ammonium bifluoride / water L, and 30 g of ammonium pyrophosph...

Embodiment 2

[0029] The titanium alloy TC4 specimen with a size of 200×150×15 is subjected to black anodic oxidation matting treatment according to the following steps.

[0030] a. Alkaline chemical surface degreasing.

[0031] The degreasing solution is an alkaline aqueous solution containing 30-50 grams of sodium hydroxide, 30-50 grams of sodium carbonate, 15-30 grams of sodium phosphate, 3-5 grams of sodium silicate, and 1-2 grams of OP emulsifier per liter of water; The temperature is 70-80°C; the workpiece is put into the solution until it is 100% wetted by clean water after being taken out and cleaned.

[0032] b. Surface chemical micro-etching treatment.

[0033] After the aforementioned degreasing and cleaning, immerse in the micro-etching treatment solution at 45-50°C for 10 minutes, take it out and clean it;

[0034] The components of the micro-etching treatment solution are: 70 g of ammonium sulfate / water L, 50 g of ammonium bifluoride / water L, and 50 g of ammonium pyrophospha...

Embodiment 3

[0044] The titanium alloy TC4 specimen with a size of 200×150×15 is subjected to black anodic oxidation matting treatment according to the following steps.

[0045] a. Alkaline chemical surface degreasing.

[0046] The degreasing solution is an alkaline aqueous solution containing 30-50 grams of sodium hydroxide, 30-50 grams of sodium carbonate, 15-30 grams of sodium phosphate, 3-5 grams of sodium silicate, and 1-2 grams of OP emulsifier per liter of water; The temperature is 70-80°C; the workpiece is put into the solution until it is 100% wetted by clean water after being taken out and cleaned.

[0047] b. Surface chemical micro-etching treatment.

[0048] After the aforementioned degreasing and cleaning, immerse in the micro-etching treatment solution at 55-65°C for 20 minutes, take it out and clean it;

[0049] The components of the micro-etching treatment solution are: 80 g / L of ammonium sulfate, 60 g / L of ammonium bifluoride, and 40 g / L of ammonium pyrophosphate.

[00...

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Abstract

The invention relates to a black anodizing process method for eliminating parasitic light from the surface of a titanium alloy component, in particular to a titanium alloy black anodizing method capable of reducing the stress on an oxide film. The titanium alloy black anodizing method comprises the following steps: removing oil from an alkaline chemical surface, activating an acid surface and black anodizing. The titanium alloy black anodizing method is characterized by comprising the following surface chemical micro etching after the step of removing the oil from the alkaline chemical surface and before the step of activating the acid surface: a micro etching solution is an aqueous solution containing 70-100g of ammonium sulfate, 50-80g of ammonium bifluoride and 30-50g of ammonium pyrophosphate in each liter of water; and etching is performed at the temperature of 45-65 DEG C for 10-30min . The titanium alloy black anodizing method has the advantages of less change of the size of a workpiece and good parasitic light eliminating property, is especially suitable for black anodizing parasitic light eliminating treatment and helps obviously improve the service life of the components.

Description

technical field [0001] The invention relates to a black anodic oxidation process method for matting the surface of a titanium alloy part, in particular to an anodic oxidation method capable of reducing the stress of an anodic oxidation film layer of a titanium alloy. Background technique [0002] Due to its small specific gravity, light weight and high specific strength, titanium and its alloys have high corrosion resistance in oxidizing media or seawater and marine atmospheres, and can still maintain their own properties at temperatures as high as 400-500 °C. Excellent properties such as strength are more and more widely used in aviation, aerospace and military fields, especially titanium alloy parts are widely used in space cameras. Titanium alloys are used as lens barrels and other structural parts in space optics, and most of them need to be black anodized, which has high requirements for the reflectivity and firmness of the film layer. [0003] The brittleness of the t...

Claims

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Application Information

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IPC IPC(8): C25D11/26
Inventor 申德新
Owner CHANGCHUN UP OPTOTECH
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