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Medium-temperature aluminum oxidation aftertreatment agent

A post-treatment agent, aluminum oxidation technology, applied in the direction of electrolytic coating, surface reaction electrolytic coating, coating, etc., can solve the problems of color fading, poor hardness, short service life of sealed workpieces, etc., to achieve easy dusting, excellent Brightness, strong practical effect

Active Publication Date: 2014-07-30
苏州禾川化学技术服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The oxide film sealed with hot water is easy to absorb CO in the air 2 , especially the adsorption of NaCl in the air in coastal areas, resulting in microporous corrosion, which makes the service life of the sealing workpiece short
Aluminum or aluminum alloy products that are sealed at room temperature have poor hardness, and colored aluminum or aluminum alloy products are prone to discoloration after sealing

Method used

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  • Medium-temperature aluminum oxidation aftertreatment agent
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Aluminum alloy anodizing process:

[0026] (1) Pretreatment

[0027] Immerse the aluminum alloy as the base material in a 140g / L-180g / L sulfuric acid solution at room temperature for 3-5 minutes, and wash off the degreasing liquid on the surface with clean water.

[0028] Immerse the above-mentioned base material for degreasing and wax removal in 50-60 g / L sodium hydroxide solution (containing alkali etching additive) at 40° C. to 60° C. for 3-8 minutes to complete the alkali etching step. Immerse the alkali-etched sample in 120g / L-150g / L sulfuric acid and 40g / L-50g / L nitric acid solution at room temperature for 2-5 minutes to emit light. Immediately immerse in clean water to wash away any residual acid on the surface.

[0029] (2) Anodizing

[0030] Immerse the sample that has been pretreated in a 150-170g / L sulfuric acid solution at a temperature of 18°C-22°C, and use 1.3A / dm 2 Oxidize at a current density for 30 minutes, and the thickness of the oxide film is ...

Embodiment 2

[0042] A medium-temperature aluminum oxidation post-treatment agent is prepared by mixing the following components by weight percentage:

[0043] Nickel Acetate: 65%, Cobalt Acetate: 1%, Sodium Naphthalene Methylene Sulfonate: 11%, Sodium Naphthalene Methylene Sulfonate: 8%, Benzoic Acid: 9%, Disodium Hydrogen Phosphate: 2%, Polyamide : 2%, sodium polyacrylate: 2%.

[0044] According to the above mass into a solution, Ni 2+ The concentration is 0.8g / L, pH5.8.

[0045] The surface of the aluminum material treated with this treatment agent is smooth and flat, with excellent brightness, and the film pores are free of powder and frost.

[0046] Put the dried sample into the Alizarin Red solution for staining, and select the sealing agent according to the depth of the stained surface. In this example, the coloring effect of the aluminum material is poor, indicating that the sealing effect is good.

[0047] Phosphorus-chromic acid weight loss method is used to detect the sealing...

Embodiment 3

[0049] A medium-temperature aluminum oxidation post-treatment agent is prepared by mixing the following components by weight percentage:

[0050] Nickel acetate: 68%, cobalt acetate: 1%, sodium methylenebisbenzylsulfonate: 10%, sodium cetylbenzenesulfonate: 7%, sodium benzoate: 8%, sodium citrate: 2%, Polyamide: 2%, Polyacrylamide: 2%.

[0051] According to the above mass into a solution, Ni 2+ The concentration is 0.9g / L, pH6.0.

[0052] After being treated with this treatment agent, the surface of the aluminum material is smooth and smooth, with excellent brightness and no powder or frost in the film pores.

[0053] Put the dried sample into the Alizarin Red solution for staining, and select the sealing agent according to the depth of the stained surface. In this example, the coloring effect of the aluminum material is poor, indicating that the sealing effect is good.

[0054] Phosphorus-chromic acid weight loss method is used to detect the sealing quality of the oxide f...

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Abstract

The invention discloses a medium-temperature aluminum oxidation aftertreatment agent. The medium-temperature aluminum oxidation aftertreatment agent is prepared by mixing the following components by weight percent: 65-75% of acetate, 1-5% of color modifier, 8-16% of dispersing agent, 5-10% of surface wetting agent, 5-10% of preservative, 1-5% of buffer agent, 1-5% of solubilizer and 1-3% of dust-proof agent. Compared with the prior art, the medium-temperature aluminum oxidation aftertreatment agent has the advantages that the medium-temperature aluminum oxidation aftertreatment agent does not contain harmful substances, is environment-friendly, overcomes the defects that common low-temperature sealants are difficult to manage, can not be used for sealing dyes and have low speeds and the defects that boiling water has high requirements on the quality, is high in energy consumption, easiness in ash generation and long in time, and has relatively strong practicability; an obtained sealing membrane layer is free from pruina and has the characteristics of excellent brightness, smoothness, discoloration prevention property, corrosion resistance, high adhesion and the like.

Description

technical field [0001] The invention relates to the technical field of aluminum or aluminum alloy surface treatment, in particular to a medium-temperature post-treatment agent for aluminum or aluminum alloy. Background technique [0002] In the modern construction industry, in order to improve the corrosion resistance and decorative properties of aluminum and aluminum alloys, aluminum and aluminum alloys are widely anodized. The oxide film obtained during aluminum anodization has high porosity and adsorption. This high The excellent porosity and adsorption are convenient for process dyeing, but it is also easy to be polluted and corroded. In order to solve these problems and protect the appearance after coloring, it is necessary to carry out sealing treatment, which is post-oxidation treatment of aluminum. [0003] In the aluminum alloy anodic oxidation post-treatment process, there are hot water sealing, water vapor sealing, room temperature sealing and medium temperature s...

Claims

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Application Information

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IPC IPC(8): C25D11/24
Inventor 景欣欣窦和琴杜威劲陈珍珍
Owner 苏州禾川化学技术服务有限公司
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