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Blackened anodic oxidation process for titanium alloy

An anodic oxidation and titanium alloy technology, applied in the direction of electrolytic coating, surface reaction electrolytic coating, coating, etc., can solve the problems of easy oxidation, poor coating adhesion, etc., and achieve the effect of improving surface performance and improving wear resistance

Pending Publication Date: 2018-12-21
SHENYANG FORTUNE PRECISION EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, titanium alloys also have some defects, such as wear resistance, easy oxidation, poor adhesion to coatings, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] A titanium alloy blackening anodic oxidation process, the specific method of the titanium alloy blackening anodic oxidation process:

[0017] (1) Degreasing: remove surface oil pollutants, increase wettability, and prevent uneven oxidation. This patent uses the alkaline degreasing agent MacDermid ISOPREP49L;

[0018] (2) Washing: full washing;

[0019] (3) Pickling: remove an irregular layer of oxide film on the surface of the titanium alloy, which is not clean, unevenly colored, and prone to spots. By mixing nitric acid, hydrofluoric acid, and water in a ratio of 2:1:7, the oxide film on the surface of titanium alloy can be effectively removed;

[0020] (4) Washing: full washing;

[0021] (5) Quickly transfer the washed titanium alloy to the anodizing tank, use an electrolyte solution containing 16 g / L of manganese sulfate as a blackening agent, and 16 g / L of ammonium sulfate as an oxidizing agent and conductive agent, and stabilize the voltage in positive DC mode ...

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PUM

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Abstract

The invention discloses a blackened anodic oxidation process for a titanium alloy. The titanium alloy oxide film can improve some surface properties of a matrix, and improve the wear resistance and the corrosion resistance of the matrix of the titanium alloy. In a traditional black staining experiment of the titanium alloy, dichromate is used as main salt of anodic oxidation electrolyte, but the dichromate has strong carcinogenicity and has serious pollution to the environment. Titanium alloy chromium-free black anodic oxidation is developed for the existed problems of the chrome-contained black staining experiment. The toxicity of the electrolyte is further reduced, so that the electrolyte is environmentally friendlier and cleaner. According to the blackened anodic oxidation process for the titanium alloy, two other salt types are used for replacing the dichromate to conduct the experiment.

Description

technical field [0001] The invention specifically relates to the fields of aerospace and semiconductor, and specifically relates to a titanium alloy blackening anodic oxidation process. Background technique [0002] With the vigorous development of aerospace, the application of light metals is becoming more and more extensive, because titanium and titanium alloys have special excellent characteristics, such as high specific strength and low density. Non-magnetic. It has the advantages of high temperature resistance, small thermal expansion coefficient and high corrosion resistance. However, titanium alloys also have some defects, such as wear resistance, easy oxidation, and poor adhesion to coatings. Surface strengthening of titanium alloys is often required. The electrochemical method is one of the most important means in surface treatment technology. Contents of the invention [0003] The purpose of the present invention is to provide a titanium alloy blackening anod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/26
CPCC25D11/26
Inventor 郭昊
Owner SHENYANG FORTUNE PRECISION EQUIP CO LTD