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A kind of environment-friendly passivation solution for aluminum or seven-series aluminum alloy and its preparation method and treatment process

A passivation solution, aluminum alloy technology, applied in the direction of metal material coating process, etc., can solve the problems of uneven passivation film, poor stability of passivation solution, poor corrosion resistance of passivation film, etc., and achieve the preparation process and treatment process. Simple operation, compact passivation film and high corrosion resistance

Active Publication Date: 2020-11-27
WENZHOU AOYANG METAL SURFACE TREATMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a kind of high-efficiency and environment-friendly passivating solution and its Preparation method and process for processing aluminum or aluminum alloy, the passivation solution has high stability, uniform and dense passivation film, high corrosion resistance, short and convenient operation of the preparation process and treatment process, and low energy consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] An environment-friendly passivation solution for aluminum or seven-series aluminum alloys, the passivation solution comprising:

[0045] Main film former: Fluotitanic acid 2g / L and Fluozirconic acid 0.5g / L;

[0046] Secondary film former: cerium salt 0.2g / L;

[0047] Strong oxidizing pore filling agent: potassium permanganate 0.2g / L;

[0048] Film-forming accelerator: sodium fluoride or sodium fluoroborate, 0.1g / L;

[0049] Complexing agent: nitrilo trimethylene phosphoric acid 1g / L;

[0050] Low foaming surfactant: acetylene glycol nonionic surfactant, 0.1g / L;

[0051] Thickener: methylcellulose, 0.1g / L;

[0052] Use ammonia water regulator to adjust the pH value of the passivation solution to 5.2~5.8, with an error range of ±0.2;

[0053] The rest is deionized water.

[0054] The preparation method of the passivation solution is as follows: first add an appropriate amount of deionized water to the reaction kettle, add a low-foaming surfactant, and heat to 40-50 ...

Embodiment 2

[0066] An environment-friendly passivation solution for aluminum or seven-series aluminum alloys, the passivation solution comprising:

[0067] Main film former: Fluotitanic acid 2.5g / L and Fluozirconic acid 1g / L;

[0068] Secondary film former: cerium salt 0.45g / L;

[0069] Strong oxidizing pore filling agent: potassium permanganate 0.35g / L;

[0070] Film-forming accelerator: sodium fluoride or sodium fluoroborate, 0.3g / L

[0071] Complexing agent: nitrilo trimethylene phosphoric acid 1.5g / L

[0072] Low foaming surfactant: acetylene glycol nonionic surfactant, 0.2g / L

[0073] Thickener: methylcellulose, 0.3g / L;

[0074] Use sodium hydroxide regulator to adjust the pH value of the passivation solution to 5.2~5.8.

[0075] The process of treating aluminum or aluminum alloy with passivation solution comprises the following steps:

[0076] (1) Mechanical grinding to remove 3~10nm natural oxide film on the surface of aluminum or aluminum alloy, using 100 # -500 # -800 # ...

Embodiment 3

[0086] An environment-friendly passivation solution for aluminum or seven-series aluminum alloys, the passivation solution comprising:

[0087] Main film former: Fluotitanic acid 3g / L and Fluozirconic acid 1.5g / L;

[0088] Secondary film former: cerium salt 0.5g / L;

[0089] Strong oxidizing pore filling agent: potassium permanganate 0.4g / L;

[0090] Film-forming accelerator: sodium fluoride or sodium fluoroborate, 0.3g / L;

[0091] Complexing agent: 1-hydroxyethylene-1,1-diphosphoric acid, 1.5g / L;

[0092] Low foaming surfactant: acetylene glycol nonionic surfactant, 0.3g / L;

[0093] Thickener: ethyl cellulose, 0.3g / L;

[0094] And use sodium hydroxide regulator to adjust the pH value of the passivation solution to 5.2~5.8, the error range is ±0.2;

[0095] The rest is deionized water.

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Abstract

The present invention provides an environmentally friendly passivation solution for aluminum or seven -series aluminum alloy and its preparation methods and treatment processes.The dynamic agent, collateral agent, low bubble surfactant and thickener; and the pH value of the pH value of the passivation solution was adjusted with sodium hydroxide or ammonia regulating agent, and the remaining waso -ion water.The passivation solution is high, the passivation film is consistent, the corrosion resistance is high.

Description

technical field [0001] The invention relates to the technical field of aluminum or aluminum alloy surface treatment, in particular to an aluminum or seven-series aluminum alloy environment-friendly chromium-free passivation solution and a preparation method and treatment process thereof. Background technique [0002] Aluminum alloy is obtained by adding magnesium, zinc, copper and other elements to pure aluminum. Because of its small specific gravity, high mechanical strength, and a series of advantages such as excellent electrical conductivity, thermal conductivity, and corrosion resistance, it is widely used in aviation and aerospace. Aluminum or aluminum alloy technology is listed as the key technology of national defense technology and the basic technology of key development. The seven-series aluminum alloy is an aluminum-zinc-magnesium-copper alloy, with strength and hardness close to steel, and good welding performance. 7055 and 7075 are the highest strength aluminum a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/34C23C22/78
CPCC23C22/34C23C22/78
Inventor 白林森梁莲芝
Owner WENZHOU AOYANG METAL SURFACE TREATMENT
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