Aluminum alloy profile surface treatment process

An aluminum alloy profile and surface treatment technology, which is applied in the direction of metal material coating process, surface pretreatment, and device for coating liquid on the surface, etc., can solve the problem of unreasonable composition and proportion, white oxide film surface, aluminum The surface roughness of the profile and other problems can be solved, and the effect of easy industrial promotion and application, durable protection of aluminum alloy profiles, and improvement of mechanical strength and wear resistance can be achieved.

Active Publication Date: 2021-10-19
安徽安铝铝业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, anodic oxidation, electrophoresis and passivation treatment are the most commonly used technologies, but anodic oxidation and passivation treatment are essentially oxide film treatment processes, which form a loose and porous aluminum oxide protective film on the surface of aluminum alloy profiles, which are resistant to acid and alkali. Performance, wear resistance, and weather resistance are poor, and sealing treatment must be carried out. The treatment process is cumbersome and time-consuming, and the surface of the oxide film is prone to whitish, black, or dark appearance quality problems. Electrophoresis technology has extremely strict requirements for operation. , if the baking time is too long, the battery solution is polluted, the components and ratio of the battery solution are unreasonable, etc., it will cause the surface of the aluminum profile to be rough, blistered, pinholes or shrinkage cavities, paint spots, flow marks, gloss Defects such as low density, uneven paint film, and cracks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The surface treatment process of aluminum alloy profiles includes the following steps:

[0024] (1) Pretreatment: Add the aluminum alloy profile into the cleaning solution for ultrasonic cleaning for 3 minutes to remove surface stains and grease;

[0025] The cleaning solution is composed of the following ingredients in weight percent: fatty alcohol polyoxyethylene ether sodium sulfate 5%, octylphenol polyoxyethylene ether OP-10 1%, triethanolamine 3%, sodium hydroxide 2%, water 89%;

[0026] (2) Passivation treatment: Under nitrogen conditions, preheat the pretreated aluminum alloy profiles to 60°C, first brush with passivation solution, and after 5 minutes of reaction, apply 2mol / L copper nitrate solution, and after 3 minutes of reaction, Then paint with passivation solution;

[0027] The passivation solution is composed of the following components in weight percent: 5% formic acid, 1% hydrofluoric acid, 5% sodium fluorozirconate, 3% potassium tungstate, 1% potassium...

Embodiment 2

[0031] Treatment process step is with embodiment 1, and difference is:

[0032] (1) Pretreatment: Ultrasonic cleaning for 4 minutes;

[0033] The cleaning solution is composed of the following ingredients in weight percent: fatty alcohol polyoxyethylene ether sodium sulfate 7.5%, octylphenol polyoxyethylene ether OP-10 3%, triethanolamine 4.5%, sodium hydroxide 3%, water 18%;

[0034] (2) Passivation treatment: preheat to 70°C, first paint with passivation solution, after 8 minutes of reaction, apply 2.5mol / L calcium nitrate solution, and after 4 minutes of reaction, then paint with passivation solution;

[0035] The passivation solution is composed of the following components in weight percent: 7.5% formic acid, 2% hydrofluoric acid, 7.5% sodium fluozirconate, 4.5% potassium tungstate, 3% potassium phytate, 5-methoxy-2 mercaptobenzene Well imidazole 3%, water 72.5%;

[0036] (3) Electrostatic spraying: electrostatic spraying process parameters: spraying voltage is 65KV, ele...

Embodiment 3

[0039] The surface treatment process of aluminum alloy profiles includes the following steps:

[0040] (1) Pretreatment: Ultrasonic cleaning for 5 minutes;

[0041] The cleaning solution is composed of the following ingredients in weight percent: fatty alcohol polyoxyethylene ether sodium sulfate 10%, octylphenol polyoxyethylene ether OP-10 5%, triethanolamine 6%, sodium hydroxide 4%, water 75%;

[0042] (2) Passivation treatment: preheat to 80°C, first paint with passivation solution, after reacting for 5-10 minutes, brush with 3mol / L zinc nitrate solution, after reacting for 5 minutes, then paint with passivation solution;

[0043] The passivation solution is composed of the following components in weight percent: 10% formic acid, 3% hydrofluoric acid, 10% sodium fluorozirconate, 6% potassium tungstate, 5% potassium phytate, 4% sodium lignosulfonate, water 62%;

[0044] (3) Electrostatic spraying: Electrostatic spraying process parameters: spraying voltage is 70KV, electro...

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Abstract

The invention discloses an aluminum alloy profile surface treatment process, which includes the following steps: (1) pretreatment: adding the aluminum alloy profile into a cleaning solution for ultrasonic cleaning for 3-5 minutes; (2) passivation treatment: under nitrogen conditions, the pretreated Aluminum alloy profiles are preheated to 60-80°C, first brushed with passivation solution, after 5-10 minutes of reaction, brushed with nitrate film-forming accelerator solution, and after 3-5 minutes of reaction, then painted with passivation solution; The passivation solution is composed of the following components by weight percentage: 5-10% formic acid, 1-3% hydrofluoric acid, 5-10% sodium fluozirconate, 3-6% potassium tungstate, and 1-5% potassium phytate , organic corrosion inhibitor 2-4%, the balance is water; (3) electrostatic spraying. The invention adopts non-aluminum oxide film-type passivation sealing "two-in-one" surface treatment technology to form a crystalline dense composite passivation film on the surface of aluminum alloy profiles, which has a fast film forming speed and is resistant to strong acid and strong alkali corrosion.

Description

technical field [0001] The invention belongs to the technical field of surface treatment of aluminum profiles, and in particular relates to a surface treatment process of aluminum alloy profiles. Background technique [0002] Aluminum alloy profiles are the most widely used non-ferrous metal structural materials in industry, and are widely used in aviation, aerospace, automobile, machinery manufacturing, shipbuilding, construction, decoration and chemical industry. Aluminum is a metal material with extremely active chemical properties. It can be oxidized naturally in the air, forming a protective film of aluminum oxide on its surface to block O 2 It is in contact with the internal aluminum metal, but alumina is an amphoteric compound with extremely poor acid and alkali resistance. It can dissolve under acid and alkali conditions and lose its protective effect. Its reaction equation in acidic environment is: Al 2 o 3 +6H + →2Al 3+ +3H 2 O, its reaction equation in alkali...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B05D7/00B05D7/14B05D3/10B05D3/02C09D177/12C09D127/06C09D7/61C23C22/34
CPCB05D3/0218B05D3/102B05D7/14B05D7/544B05D2320/00B05D2506/25B05D2518/00C09D177/12C23C22/34C09D7/61B05D2425/01C08L27/06C08K3/38C08K3/28
Inventor 谢磊
Owner 安徽安铝铝业有限公司
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