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Surface rare-earth film transforming agent and surface rare-earth film transformation processing method of aluminium alloy

A technology of aluminum alloy surface and conversion treatment, applied in the direction of metal material coating process, etc., can solve the problems of long process cycle unfavorable practical application, unfavorable engineering practical application, complicated solution formula, etc., and achieve the elimination of electrochemical deposition equipment, film formation The effect of high speed and low production cost

Inactive Publication Date: 2010-09-01
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, various existing methods have their limitations. For example, the rare earth salt bath deposition technology is time-consuming to produce, the process cycle is too long, which is not conducive to practical application, and the solution formula is complicated; the high temperature rare earth salt bath deposition technology requires relatively high temperature. It is also not conducive to the development of the process; the potential required by the aqueous colloid electrophoresis deposition technology is too high, higher than the 36V safe voltage, and the deposition efficiency is also low, which is not conducive to practical engineering applications

Method used

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  • Surface rare-earth film transforming agent and surface rare-earth film transformation processing method of aluminium alloy
  • Surface rare-earth film transforming agent and surface rare-earth film transformation processing method of aluminium alloy
  • Surface rare-earth film transforming agent and surface rare-earth film transformation processing method of aluminium alloy

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Effect test

Embodiment 1

[0046] Surface Rare Earth Film Conversion Treatment on AA5083 Aluminum Alloy

[0047] (1) Mechanically polish and degrease the AA5083 aluminum alloy: mechanically polish the AA5083 aluminum alloy workpiece that needs surface treatment until the Ra is 0.075 μm and degrease, and then clean the surface;

[0048] (2) Alkaline cleaning: Soak in an alkaline cleaning solution at 50°C for 1 minute. The alkaline cleaning solution contains 30g / L of NaOH, 2.5g / L of NaCl, and 0.5ml / L of dodecane Sodium phenyl sulfonate surfactant;

[0049] (3) Washing: Wash the surface of the processed AA5083 aluminum alloy workpiece with clear water, and then dry it naturally;

[0050] (4) surface rare earth film conversion treatment: the dry AA5083 aluminum alloy is immersed in the surface rare earth film conversion agent for 3 hours, and the surface rare earth film conversion agent contains 1 (L): 4 (g): 10 (m L) ethanol solvent of proportioning, cerium nitrate hexahydrate and hydrogen peroxide three...

Embodiment 2

[0054] AA5083 Aluminum Alloy Surface Rare Earth Film Conversion Treatment

[0055] (1) Mechanically polish and degrease the AA5083 aluminum alloy: mechanically polish the AA5083 aluminum alloy workpiece that needs surface treatment to Ra0.025μm and degrease, and then clean the surface;

[0056] (2) Alkaline cleaning: Soak in an alkaline cleaning solution at 40°C for 1 minute. The alkaline cleaning solution contains 50g / L of NaOH, 0.5g / L of NaCl, 1ml / L of quaternary ammonium compounds and Betaine type mixed surfactant in volume ratio 1:1;

[0057] (3) Washing: the surface of the treated AA5083 aluminum alloy workpiece is cleaned with water, and then dried with a fan;

[0058] (4) surface rare earth film conversion treatment: the dry AA5083 aluminum alloy is immersed in the surface rare earth film conversion agent for 2 hours, and the surface rare earth film conversion agent contains 1 (L): 1 (g): 5 (mL ) ethanol solvent, cerium chloride and performic acid three components;

...

Embodiment 3

[0061] AA5083 Aluminum Alloy Surface Rare Earth Film Conversion Treatment

[0062] (1) Mechanically polish and degrease the AA5083 aluminum alloy: mechanically polish the AA5083 aluminum alloy workpiece that needs surface treatment until the Ra is 0.01 μm and degrease, and then clean the surface;

[0063] (2) Alkaline cleaning: Soak in an alkaline cleaning solution at 60°C for 5 minutes. The alkaline cleaning solution contains 10g / L NaOH, 5g / L NaCl, and 0.1ml / L polysorbate surface active agent;

[0064] (3) Washing: Wash the surface of the processed AA5083 aluminum alloy workpiece with clear water, and then dry it naturally;

[0065] (4) Surface rare earth film conversion treatment: the dry AA5083 aluminum alloy is immersed in the surface rare earth film conversion agent for 4 hours, and the surface rare earth film conversion agent contains 1 (L): 10 (g): 1 (m L) methanol alcohol solvent, cerium nitrate hexahydrate, hydrogen peroxide and methyl ethyl ketone peroxide mixed ox...

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Abstract

The invention provides a surface rare-earth film transforming agent comprising the following materials by ratio: an alcohol solvent:cerium salt:an oxidant=1 L:[1-10 g]:[1-10 mL]. The invention also discloses a surface rare-earth film transformation processing method of an aluminium alloy, comprising the following steps of: surface preprocessing of the aluminium alloy, surface rare-earth film transformation processing, surface rare-earth film curing, and the like. The surface rare-earth film transforming agent has stable property and convenient use; a generated rare-earth film is compact and firm; and in addition, the surface rare-earth film transformation processing method of the aluminium alloy has simple process, economy, environmental protection and fast film formation, and can obtain good corrosion-resistant rare-earth transformed film.

Description

technical field [0001] The invention belongs to the field of aluminum alloy surface treatment, and in particular relates to the use of a surface rare earth film conversion agent and an aluminum alloy surface rare earth film conversion treatment method. Background technique [0002] Aluminum alloys with high strength-to-mass ratio are widely used in aerospace, aviation, automobiles, bicycles and other industrial fields. However, the local corrosion of aluminum alloys (such as pitting corrosion - pitting corrosion, linear corrosion - filiform corrosion, etc.) has always been one of the main reasons for its failure. It is also one of the most common forms of localized corrosion in aluminum alloys or similar alloys that are easily passivated on the surface, and often occurs in an environment where aggressive anions and oxidants coexist. This type of corrosion has been widely valued and deeply studied because of its strong concealment and destructiveness. Therefore, it is neces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/02
Inventor 周明杰孙道明许勇
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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