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Practical nickel-free sealing agent for aluminum alloy anodic oxidation

A technology of anodic oxidation and nickel sealing, which is applied in coatings, surface reaction electrolytic coatings, electrolytic coatings, etc., can solve the problems of high energy consumption of sealing agents, high overall cost, and high price of cobalt salts, etc., and achieve a sealing effect Excellent, improve the comprehensive effect of sealing hole, the effect of affordable price

Inactive Publication Date: 2014-03-26
台山市科美化学工业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many related reports on nickel-free sealing technology, but few of them are relatively mature and have successfully realized industrialization. For example, the German Henkel nickel-free sealing agent has been approved in the European market. The sealing agent is based on cobalt salt. However, due to the high price of cobalt salt and the high energy consumption of this type of sealing agent, the overall cost of its industrial application is relatively high, so it is not ideal for industrial application in China

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Pre-treatment: acid degreasing → two washings → alkali etching → two washings → light → two washings

[0022] Anodizing: sulfuric acid concentration 160~180g / L, current density 1.45A / dm 2 , temperature 20°C,

[0023] Sealing: sealing agent concentration 10g / L, pH: 5.5, temperature: 85°C, time 1.0um / min,

[0024] The composition of the sealing agent stock solution (sodium acetate 20%, cobalt acetate 0.3%, sorbitol 3%, additives 15%, water balance)

Embodiment 2

[0026] Pretreatment: the conditions are consistent with Example 1

[0027] Anodizing: operating parameters are consistent with embodiment 1

[0028] Sealing: sealing agent concentration 10g / L, pH: 5.8, temperature: 85°C, time 1.0um / min,

[0029] The composition of the sealing agent stock solution (consistent with Example 1)

Embodiment 3

[0031] Pretreatment: the conditions are consistent with Example 1

[0032] Anodizing: operating parameters are consistent with embodiment 1

[0033] Sealing: sealing agent concentration 10g / L, pH: 6.0, temperature: 85°C, time 1.0um / min,

[0034] The composition of the sealing agent stock solution (consistent with Example 1)

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PUM

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Abstract

The invention provides a practical nickel-free sealing agent for aluminum alloy anodic oxidation, which is prepared by compounding primary salt sodium acetate, secondary salt cobalt acetate and a penetrant sorbitol in combination with an assistant. The physical state is powder or water. The practical nickel-free sealing agent for aluminum alloy anodic oxidation, provided by the invention, is affordable and non-toxic to the ecological environment, and realizes an equivalent effect as nickel salt sealing; the sealing effect on an organic dyed film (red or yellow) is better than that of a nickel salt sealing agent.

Description

technical field [0001] The invention relates to the technical field of nickel-free sealing of aluminum alloy anodic oxidation, in particular to a practical nickel-free sealing agent for aluminum alloy anodic oxidation. Background technique [0002] Since the birth of nickel salt sealers, nickel-containing sealers have always occupied an overwhelming market share in aluminum alloy anodic oxidation sealing. The leaching of dyes (except red or yellow dyes) and energy consumption during sealing are relatively low, and all properties of anodized aluminum products after sealing can meet relevant standards. Nickel salt sealing agent has contributed a lot to the development of aluminum processing, but it is an indisputable fact that metal nickel pollutes the environment. In addition, the nickel-containing sealing bath solution contains a large amount of nickel ions. Workers exposed to this environment for a long time and in contact with the workpiece for a long time may induce alle...

Claims

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Application Information

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IPC IPC(8): C25D11/18
Inventor 吴国炎伍胜郑栋桥李顺
Owner 台山市科美化学工业有限公司
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