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Faintly acid suspension liquid for removing anodic oxide film of titanium and titanium alloy

A technology of anodic oxide film and titanium alloy is applied in the field of weak acid suspension, which can solve the problems of poor stability, high degree of harm to workers, accumulation of electric charges, etc., and achieve the effect of convenient replenishment.

Inactive Publication Date: 2012-07-11
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The operation cost of using alkali molten salt is high, and the degree of harm to workers is relatively large. In addition, charge accumulation is easy to form between the workpiece and the hanger
The alkaline stripping solution developed by Beijing University of Aeronautics and Astronautics for stripping the anodized film of titanium and titanium alloy uses hydrogen peroxide H 2 o 2 , sodium hydroxide NaOH (potassium hydroxide KOH) as the main component, although the method is simple and easy, but due to heating, strong alkali and impurity ions (Fe 3+ etc.) condition H 2 o 2 Extremely poor stability, difficult to use continuously

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Composition and ratio of formula solid powder (parts by mass):

[0025] Ammonium Bifluoride 100, Ammonium Fluoride 20, Sodium Fluoride 30

[0026] Oxalic acid 20, sulfamic acid 10, barium nitrate 30

[0027] Calcium carbonate 5, sodium fluoroborate 15

[0028] (2) The ratio of formula solid powder to distilled water is 1:0.4 (mass ratio)

[0029] Stir well to form a suspension.

[0030] (3) Aging for 2 hours, the pH value is about 3.

[0031] (4) Film withdrawal and results

[0032] Stir the above suspension magnetically, and heat it to 50°C, put it into a TC4 titanium alloy sample containing an anodized film (film thickness 25±3μm), treat it for 2 minutes, take it out, rinse it with water and dry it naturally, measure the thickness with a thickness gauge It is 0~1μm, and can re-anodize the film, and the quality is good.

Embodiment 2

[0034] (1) Composition and ratio of formula solid powder (parts by mass):

[0035] Ammonium fluoride 100, ammonium bifluoride 10, sodium fluoride 40

[0036] Oxalic acid 20, sulfamic acid 10, barium nitrate 30

[0037] Calcium carbonate 5, sodium fluoroborate 15

[0038] (2) The ratio of formula solid powder to distilled water is 1:0.3 (mass ratio)

[0039] Stir well to form a suspension.

[0040] (3) Aging for 2 hours, the pH value is about 5.

[0041] (4) Film withdrawal and results

[0042] Stir the above suspension with magnetic force, and heat it to 75°C, put it into a TB6 titanium alloy sample containing an anodized film (film thickness 25±3μm), treat it for 10 minutes, take it out, rinse it with water and dry it naturally, measure the thickness with a thickness gauge It is 0~1μm, and can re-anodize the film, and the quality is good.

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Abstract

The invention discloses a faintly acid suspension liquid for removing anodic oxide film of titanium and titanium alloy, which is prepared by formula solid powder and distilled water by a mass ratio of 1:(0.2-1),wherein the Potential of Hydrogen (pH) is in a range between 3 and 6, fluorides of the formula solid powder are in an amount of 50wt.% to 80wt.% , solid acid is in an amount of 10wt.% to 50wt.%, stimulating materials are in an amount of 5wt.% to 50wt.%. A trace of Hydrogen Fluoride (HF) retreating film is produced on the basis of the principle of chemical equilibrium mobile on the faintly acid condition, therefore, the preparing method is simple and effective, convenient to refill, and has a continuous controllability , no erosion to matrixes and no harm to human bodies.

Description

technical field [0001] The invention relates to a weakly acidic suspension prepared with water, in particular to a weakly acidic suspension used for removing anodized films of titanium and titanium alloys. Background technique [0002] Titanium and titanium alloys (such as TC4, TB6, Ti-47121, etc.) have small specific gravity, high specific strength, high temperature resistance, corrosion resistance and other excellent properties, and are widely used in military, aviation, aerospace, medical, chemical and other fields. Applications. For example: titanium alloy parts on aircraft include: non-structural parts (such as hydraulic, air-conditioning, control and other system parts and ducts in military aircraft), engine parts (such as engine compressor discs, blades and casings, etc.), aircraft structural parts (such as fuselage, landing gear, wing load-bearing components and fasteners, etc.); used as lens barrels and other structural parts in space cameras. The anodized titan...

Claims

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Application Information

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IPC IPC(8): C23G1/10
Inventor 吴光辉张刚李振宇周雅王春霞肖胜辉
Owner NANCHANG HANGKONG UNIVERSITY
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