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Aluminum alloy oxide film nickel-free normal-temperature sealing process and sealing agent

A normal temperature sealing, aluminum alloy technology, applied in the field of aluminum alloy additives, can solve problems such as carcinogenicity and skin inflammation, and achieve the effect of simple and easy-to-use wastewater treatment

Inactive Publication Date: 2015-02-11
湖州织里天荣铝材添加剂厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the low-temperature or medium-temperature oxide film sealants mainly used in my country contain a large amount of heavy metal nickel. Because of long-term contact with the human body, the mild ones will cause skin inflammation, and the severe ones may cause cancer. Therefore, many countries in the world have restricted all kinds of nickel. The use of nickel and aluminum products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Aluminum alloy oxide film nickel-free room temperature sealant composition:

[0043] Titanium sulfate: 0.5mmol / L, glycolic acid: 1.5mmol / L,

[0044] Hydrofluoric acid: 0.2g / L, Fluoboric acid: 0.1g / L,

[0045] Boric acid: 1.0g / L, thiourea: 1.0g / L, deionized water: balance.

[0046] Process conditions: PH (adjusted with acetic acid or ammonia water) 6.0, temperature 35°C.

[0047] An aluminum product with a film thickness of 10um produced by pretreatment and anodic oxidation is placed in the above-mentioned blocking solution for 10 minutes. After taking out the aluminum alloy product, wash it twice with tap water, once with pure water, and air-dry.

[0048] Check that there is no water stain and powder frost on the surface of the sample. According to GB / T 8753.2-2005 phosphorus-chromic acid method weight loss 21.8mg / dm 2 .

Embodiment 2

[0050] Aluminum alloy oxide film nickel-free room temperature sealant composition:

[0051] Zirconium acetate: 5mmol / L, oxalic acid: 15mmol / L,

[0052] Sodium fluoride: 1.0g / L, sodium fluoroborate: 0.5g / L,

[0053] Sodium silicate: 0.5g / L, potassium hydrogen phthalate: 2.0g / L, deionized water: balance.

[0054] Process conditions: PH (adjusted with acetic acid or ammonia water) 5.5, temperature 30°C.

[0055] Aluminum products with a film thickness of 15um produced by pretreatment and anodic oxidation are electrolytically colored to champagne color, and put into the above-mentioned blocking solution for 7 minutes. After taking out the aluminum alloy product, wash it twice with tap water, once with pure water, and air-dry.

[0056] Check that there is no water stain and powder frost on the surface of the sample. According to GB / T 8753.2-2005 phosphorus-chromic acid method weight loss 15.6mg / dm 2 .

Embodiment 3

[0058] Aluminum alloy oxide film nickel-free room temperature sealant composition:

[0059] Potassium titanium oxalate: 15mmol / L, HEDP: 40mmol / L,

[0060] Ammonium fluoride: 2.5g / L, ammonium fluoroborate: 0.5g / L, sodium acetate: 1.0g / L,

[0061] Dimethylthiourea: 3.0g / L, deionized water: balance.

[0062] Process conditions: pH (adjusted with acetic acid or ammonia water) 4.5, temperature 20°C.

[0063]According to the pretreatment, the aluminum product with a film thickness of 10 μm made by anodic oxidation is dyed red again, and put into the above-mentioned blocking solution for 5 minutes. After taking out the aluminum alloy product, wash it twice with tap water, once with pure water, and air-dry.

[0064] Check that there is no water stain and powder frost on the surface of the sample. According to GB / T 8753.2-2005 phosphorus-chromic acid method weight loss 11.2mg / dm 2 .

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PUM

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Abstract

The invention provides a normal-temperature sealing agent which can obtain oxide film sealing performance and corrosion resistance equivalent or superior to that by using a nickel-containing oxide film sealing agent, is easy to use, does not contain heavy metal, is simple in wastewater treatment and does not cause environmental pollution. The aluminum alloy oxide film nickel-free normal-temperature sealing agent contains at least one of compound A selected from water-soluble titanium compound or water-soluble zirconium compound and an organic compound B which is used as a stabilizer and is provided with a plurality of functional groups, wherein the content of the compound A is 0.1-50mmol / L; the content of the organic compound B is 2.5-10 times of the content of the compound A. The sealing agent further comprises accelerant with content of 0.1-5.0g / L and PH buffering agent with content of 1.0-20.0g / L.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy additives, and more specifically relates to an aluminum alloy oxide film nickel-free normal temperature sealing process and a sealing agent. Background technique [0002] The oxide film of anodized aluminum alloy has a large number of nano pores, they have a strong adsorption capacity, and the corrosion resistance of the oxide film exposed to the environment is weak. [0003] At present, the low-temperature or medium-temperature oxide film sealants mainly used in my country contain a large amount of heavy metal nickel. Because of long-term contact with the human body, the mild ones will cause skin inflammation, and the severe ones may cause cancer. Therefore, many countries in the world have restricted all kinds of nickel. The use of nickel and aluminum products. At present, since 2008, my country has stepped up efforts to remediate environmental pollution, and the requirement for total nic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/18C25D11/22C25D11/24
CPCC25D11/18C25D11/22C25D11/24
Inventor 周国新顾志山
Owner 湖州织里天荣铝材添加剂厂
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