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Technique for preparing high-hardness large-aperture thick film by mixed acid anode oxidation

A technology of anodic oxidation and mixed acid, which is applied in the direction of anodic oxidation, can solve the problems of large energy consumption and achieve good application prospects, significant economic benefits and social effects

Active Publication Date: 2008-08-13
CHINALCO MATERIALS APPL RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process uses a low-temperature anodizing method, and the cooling of the anodizing electrolyte requires a large amount of energy.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Steps: 1), configure the composite electrolyte: use the mixed acid of phosphoric acid and oxalic acid as the electrolyte, the phosphoric acid in the electrolyte is 100g / l, and the concentration of oxalic acid is 45g / l;

[0029] 2), Aluminum sample pretreatment: wash in 80g / l, 30℃ NaOH alkaline solution for 8min, then wash in 200g / l HNO 3 Wash in aqueous solution for 5 minutes, then rinse with water;

[0030] 3), electrochemical polishing: the polishing solution is a mixed acid of perchloric acid and absolute ethanol, the volume ratio is 1:5, the cathode plate is titanium plate, the area ratio of the cathode and the anode is 3:1, the voltage is 14V, the time 5 minutes; eliminate the surface slip marks left by the aluminum sample during production and transportation, and improve the uniformity of the porous alumina film;

[0031] 4) Anodic oxidation: use a titanium plate as the cathode, the area ratio of the cathode to the anode is 5:1, the distance between the cathode a...

Embodiment 2

[0035] Steps: 1), configure the composite electrolyte: use the mixed acid of phosphoric acid and oxalic acid as the electrolyte, the phosphoric acid in the electrolyte is 10g / l, and the concentration of oxalic acid is 9g / l;

[0036] 2) Aluminum sample pretreatment: wash in 80g / l, 30℃ NaOH alkaline solution for 5min, then wash in 200g / l HNO 3 Wash in aqueous solution for 3 minutes, then rinse with water;

[0037] 3), electrochemical polishing: the polishing solution is a mixed acid of perchloric acid and absolute ethanol, the volume ratio is 1:5, the cathode plate is titanium plate, the area ratio of the cathode and the anode is 3:1, the voltage is 16V, the time 3 minutes; the purpose of electrochemical polishing is to eliminate the surface slip marks left by the aluminum sample during production and transportation, and improve the uniformity of the porous alumina film;

[0038] 4) Anodizing: use a stainless steel plate as the cathode, the area ratio of the cathode to the anod...

Embodiment 3

[0042] Steps: 1), configure the composite electrolyte: use the mixed acid of phosphoric acid and oxalic acid as the electrolyte, the phosphoric acid in the electrolyte is 20g / l, and the concentration of oxalic acid is 20g / l;

[0043] 2) Aluminum sample pretreatment: wash in 80g / l, 30℃ NaOH alkaline solution for 6min, then wash in 200g / l HNO 3 Wash in aqueous solution for 4 minutes, then rinse with water;

[0044] 3), electrochemical polishing: the polishing solution is a mixed acid of perchloric acid and absolute ethanol, the volume ratio is 1:5, the cathode plate is titanium plate, the area ratio of the cathode and the anode is 3:1, the voltage is 15V, the time 4 minutes; the purpose of electrochemical polishing is to eliminate the surface slip marks left by the aluminum sample during production and transportation, and improve the uniformity of the porous alumina film;

[0045]4) Anodizing: use a stainless steel plate as the cathode, the area ratio of the cathode to the anod...

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Abstract

The invention relates to a technology of mixed acid anodizing high hardness wide-bore thick-film, first the anodizing solution is mixed with the phosphoric acid and the oxalic acid preparation; then the alkaline solution removes the oxide layer of specimen surface; and then acidic solution neutralizes the surface residue, followed by electrochemical polishing treatment; more the anode is oxidized to prepare the porous alumina, finally the specimen of anodization in the phosphoric acid solution process the reaming. The invention relates to a method of the mixed acid with the phosphoric acid and the oxalic acid as the electrolyte to form 20-45um porous alumina film; the anode is oxidized by the phosphoric acid to reaming, the aperture increased to 80-140nm; the temperature of the anodization mixed the oxalic acid is higher greatly, to save the energy; the micromesh of the mixed acid anodic alumina film fills in the PTFE, MoS2, carbon nano fibers, zinc stearate, and other solid lubricants, prepared to self-lubricating materials, the invention is worthy of spreading to application.

Description

technical field [0001] The invention relates to an aluminum alloy anodic oxidation process, in particular to a process for preparing a high-hardness large-aperture thick film with a mixed acid, and belongs to the technical field of aluminum alloy surface treatment. Background technique [0002] Aluminum is the metal material with the largest amount of use and the widest application range among non-ferrous metals. Aluminum and aluminum alloys have many superior properties and can meet various use requirements put forward by various industries. However, some properties of aluminum are not ideal, such as surface properties such as hardness, wear resistance and corrosion resistance. [0003] In order to strengthen the application of aluminum in the field of tribology, many scholars have carried out research on the surface modification of aluminum tribology. Anodic oxidation of aluminum in acidic electrolyte forms a hard aluminum oxide film with a microporous structure on the su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/08
Inventor 张栋张文静李炼乐永康毛建伟张建平
Owner CHINALCO MATERIALS APPL RES INST CO LTD
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