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A chromic acid anodizing method for folded aluminum alloy parts

A kind of aluminum alloy parts, anodizing technology, applied in the field of material processing, can solve the problems of bare leakage, no protective layer, corrosion and so on

Active Publication Date: 2019-05-14
HARBIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the process of designing the aluminum alloy parts of the aircraft, many sheet metal parts are folded after forming, and the gap is required to be within 0.1mm. For such parts in the production process, the folded parts are in the process of surface treatment In many cases, no oxide film will be formed. After riveting to the aircraft in the future, this position is a bare aluminum alloy base material without a protective layer, so it is more prone to corrosion.

Method used

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  • A chromic acid anodizing method for folded aluminum alloy parts
  • A chromic acid anodizing method for folded aluminum alloy parts

Examples

Experimental program
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Effect test

example 1

[0077] After leaving a gap of 0.1mm for the folded parts, wipe the aluminum alloy with methyl ethyl ketone; immerse in a 61°C alkaline cleaning solution (sodium carbonate 42g / L, sodium phosphate 21.8g / L, sodium silicate 0.8g / L, After 5 minutes of surface active agent), wash with water for 4 minutes; observe the continuous water film on the surface of the aluminum alloy sample and then carry out pickling; The concentration of sulfuric acid is 53g / L, the concentration of sulfuric acid is 286g / L, etching for 4min, washing with water for 5min; put the pretreated aluminum alloy parts in the chromic acid anodizing solution: chromic anhydride 57.3g / L, temperature 41℃, voltage 20V2, Oxidation for 30min. A pure lead plate is used as the cathode, and compressed air is used to stir during the anodizing process. After oxidation, wash with water for 4 minutes and blow dry with compressed air in time.

[0078] The appearance of the oxide film obtained in this example is qualified, the thi...

example 2

[0080] After leaving a gap of 0.08mm for the folded parts, wipe the aluminum alloy with methyl ethyl ketone; immerse in a 63°C alkaline cleaning solution (sodium carbonate 41.4g / L, sodium phosphate 21.6g / L, sodium silicate 0.7g / L , some surfactants) after 4 minutes, wash with water for 4 minutes; pickle after observing the continuous water film on the surface of the aluminum alloy sample; in the pickling solution (a mixed solution of chromic anhydride, sulfuric acid and deionized water) The concentration is 52g / L, the concentration of sulfuric acid is 282g / L, etched for 5 minutes, and washed with water for 5 minutes; put the pretreated aluminum alloy parts in the chromic acid anodizing solution: chromic anhydride 57.0g / L, temperature 39°C, voltage 20V2 , Oxidation 50min. A pure lead plate is used as the cathode, and compressed air is used to stir during the anodizing process. After oxidation, wash with water for 4 minutes and blow dry with compressed air in time.

[0081] Th...

example 3

[0083] After leaving a gap of 0.09mm for the folded parts, wipe the aluminum alloy with methyl ethyl ketone; immerse it in a 59°C alkaline cleaning solution (sodium carbonate 40g / L, sodium phosphate 21g / L, sodium silicate 0.5g / L, surface After 4 minutes of activating agent), wash with water for 4 minutes; observe the continuous water film on the surface of the aluminum alloy sample and then carry out pickling; 50g / L, sulfuric acid concentration is 272g / L, etching for 4min, washing with water for 5min; put the pretreated aluminum alloy parts in chromic acid anodizing solution: chromic anhydride 57.1g / L, temperature 41℃, voltage 20V, oxidation 30min. A pure lead plate is used as the cathode, and compressed air is used to stir during the anodizing process. After oxidation, wash with water for 5 minutes and blow dry with compressed air in time.

[0084] The appearance of the oxide film obtained in this example is qualified, the thickness of the film layer is 3.6um, the sealabili...

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Abstract

The invention belongs to the field of material processing, and particularly relates to a chromic acid anodizing method of a fold-type aluminum alloy part. After a gap with the width of 0.1mm is reserved through a folding piece, the gap is placed perpendicular to a negative plate, in this way, power lines can be evenly distributed in the gap, and the electric current density in an anodized bath solution which is stirred can further be even, and thus each index (appearance, film thickness, airtightness, continuity and cohesion) of a formed oxidation film meets the requirements for technology properties of a common chromic acid anodizing film.

Description

technical field [0001] The invention belongs to the field of material processing, and in particular relates to a chromic acid anodization method for folded aluminum alloy parts. Background technique [0002] In the process of designing the aluminum alloy parts of the aircraft, many sheet metal parts are folded after forming, and the gap is required to be within 0.1mm. For such parts in the production process, the folded parts are in the process of surface treatment In many cases, no oxide film will be formed. After riveting to the aircraft in the future, this position is a bare aluminum alloy base material without a protective layer, so it is more prone to corrosion. In order to solve the film formation of such parts in the folding area and meet the protection performance requirements of the process, it is necessary to study the process method. Contents of the invention [0003] The technical problem to be solved in the present invention: [0004] Propose a chromic acid ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/08C25D11/16C25D11/18C23G1/22C23G1/12
CPCC23G1/125C23G1/22C25D11/08C25D11/16C25D11/18
Inventor 李艳梅万杰石镇滔张星汪原
Owner HARBIN