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Method for preparing cerium-manganese/molybdenum multi-element composite conversion coating on surface of aluminum alloy

An aluminum alloy surface, multi-component composite technology, applied in the direction of metal material coating process, etc., can solve the problems of insufficient corrosion resistance of the film layer and insufficient stability of the passivation solution, and achieve simple composition, good bonding force, and energy saving. Effect

Active Publication Date: 2013-09-04
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the problem that the stability of the passivation solution is not good enough, and the corrosion resistance of the obtained film layer is not good enough.

Method used

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  • Method for preparing cerium-manganese/molybdenum multi-element composite conversion coating on surface of aluminum alloy
  • Method for preparing cerium-manganese/molybdenum multi-element composite conversion coating on surface of aluminum alloy
  • Method for preparing cerium-manganese/molybdenum multi-element composite conversion coating on surface of aluminum alloy

Examples

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Effect test

Embodiment 1

[0061] In this embodiment, the method for preparing a cerium-manganese / molybdenum multi-component composite conversion film on the surface of an aluminum alloy includes the following steps:

[0062] (1) Sample preparation: online cutting from 6063 aluminum alloy profiles (thickness 4mm), cut out 40×40mm samples, punch holes in the corners of each sample, and use SiC water sandpaper to polish the aluminum alloy surface to 1500#, rinse it with deionized water, dry it with a hair dryer, and hang it with a thin wire at the hole;

[0063] (2) Pre-treatment activation: put the aluminum alloy in industrial acid at 30°C for surface degreasing, soak for 3 minutes, wash the surface of the alloy with deionized water, then place it in mixed acid at 30°C for 1 minute, and then use deionized Rinse with water and dry with a hair dryer for later use. The composition of industrial acid is 100g / L sulfuric acid + 20mL / L phosphoric acid + 0.3g / LOP-10 + 6mL / L hydrofluoric acid, and the compositio...

Embodiment 2

[0076] In this embodiment, the method for preparing a cerium-manganese / molybdenum multi-component composite conversion film on the surface of an aluminum alloy includes the following steps:

[0077] (1) Sample preparation: online cutting from 6063 aluminum alloy profiles (thickness 4mm), cut out 40×40mm samples, punch holes in the corners of each sample, and use SiC water sandpaper to polish the aluminum alloy surface to 1500#, rinse it with deionized water, dry it with a hair dryer, and hang it with a thin wire at the hole;

[0078] (2) Pre-treatment activation: put the aluminum alloy in industrial acid at 20°C for surface degreasing, soak for 8 minutes, wash the surface of the alloy with deionized water, then place it in a mixed acid at 20°C for 3 minutes, and then use deionized Rinse with water and dry with a hair dryer for later use. Every liter of industrial acid contains 60g of sulfuric acid, 10mL of phosphoric acid, 0.1g of OP-10 and 1mL of hydrofluoric acid; the mixed...

Embodiment 3

[0084]In this embodiment, the method for preparing a cerium-manganese / molybdenum multi-component composite conversion film on the surface of an aluminum alloy includes the following steps:

[0085] (1) Sample preparation: online cutting from 6063 aluminum alloy profiles (thickness 4mm), cut out 40×40mm samples, punch holes in the corners of each sample, and use SiC water sandpaper to polish the aluminum alloy surface to 1500#, rinse it with deionized water, dry it with a hair dryer, and hang it with a thin wire at the hole;

[0086] (2) Pre-treatment activation: put the aluminum alloy in industrial acid at 35°C for surface degreasing, soak for 1 min, wash the surface of the alloy with deionized water, then place it in mixed acid at 35°C for 0.5 min, and then use Rinse with ionized water and dry with a hair dryer for later use. Every liter of industrial acid contains 200g of sulfuric acid, 30mL of phosphoric acid, 1.0g of OP-10 and 12mL of hydrofluoric acid; the mixed acid con...

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Abstract

The invention discloses a method for preparing a cerium-manganese / molybdenum multi-element composite conversion coating on the surface of aluminum alloy. The method comprises the following steps of: (1) pretreating and activating the aluminum alloy; and (2) placing the aluminum alloy treated in the step (1) in Ce-Mn conditioning fluid so as to prepare the golden cerium-manganese conversion coating on the surface of the aluminum alloy; and (3) placing the aluminum alloy treated in the step (2) in Mo-containing conditioning fluid to obtain the cerium-manganese / molybdenum multi-element composite conversion coating. The conditioning fluids adopted in the method do not contain toxic substances. The multi-element composite conversion coating with excellent corrosion resistance and weather resistance as well as relatively good wear resistance can be prepared on the surface of aluminum alloy. The method is relatively simple in technology, simple and convenient to operate, low in cost and easy to industrialize.

Description

technical field [0001] The invention relates to a treatment method for preparing a chromium-free chemical conversion on the surface of an aluminum alloy, in particular to a method for preparing a cerium-manganese / molybdenum multi-element composite conversion film on the surface of an aluminum alloy. Background technique [0002] Aluminum alloy is the second most used metal material after steel. In the atmospheric environment, aluminum alloy can form a very thin oxide film on the surface to avoid corrosion, but this spontaneous oxide film is easily damaged, especially when it contains Cl - In the environment, pitting corrosion, crevice corrosion, stress corrosion and other damages are prone to occur. In order to overcome the shortcomings of aluminum alloy surface properties, expand its application range, and prolong its service life, aluminum alloy surface protection is very important. [0003] Chromate passivation technology has been widely used because of its excellent co...

Claims

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Application Information

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IPC IPC(8): C23C22/56C23C22/40
Inventor 杜军凡婷潘伟深李文芳武卫社穆松林
Owner SOUTH CHINA UNIV OF TECH
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