Alkali-resistant confining liquid and confining technology of aluminum alloy surface oxide film

A technology of sealing liquid and alkali resistance, which is applied in the direction of surface reaction electrolytic coating, electrolytic coating, coating, etc., which can solve the problems of poor corrosion resistance, excessive waste water generation, short salt spray resistance time, etc., and achieve simple sealing process , Enhanced anti-salt spray ability and short sealing time

Inactive Publication Date: 2018-10-09
SHANGHAI LVTONG CHEM TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the most widely used sealing process with better effect is three-step sealing, that is, after anodizing, the aluminum material has undergone two normal-temperature sealing and one high-temperature sealing successively, such as patent CN 103469276 A, after three sealing treatments, The acid and alkali resistance of aluminum is improved, but the process is cumbersome, the maintenance is complicated, the waste water is generated, and the salt spray resistance time is short
Patent DE 1521664 proposes to seal the anodized aluminum material in an alkaline solution containing metal salts, and then seal it with a silicate aqueous solution. The alkali resistance of the aluminum material is significantly improved, but the corrosion resistance is poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Preparation of alkaline-resistant blocking solution

[0027] Preparation of the first blocking solution:

[0028] Weigh 4.24g of nickel acetate, 2.21g of sodium fluoride, and 5g of AEO-7, add the above components into 1L of deionized water in sequence, and obtain the first blocking solution after completely dissolving. The nickel ion concentration in the first blocking solution is 1g / L, the fluoride ion concentration is 1g / L, and the AEO-7 concentration is 5g / L.

[0029] Preparation of the second blocking solution:

[0030] Weigh 5g of sodium silicate, 3g of sodium lauryl sulfate, and 10g of sorbitol, and add the above components into 1L of deionized water in sequence, and obtain the second blocking solution after completely dissolving. The concentration of sodium silicate in the first blocking solution is 5g / L, the concentration of sodium lauryl sulfate is 3g / L, and the concentration of sorbitol is 10g / L.

[0031] 2) Sealing of oxide film on aluminum alloy surfac...

Embodiment 2

[0037] 1) Preparation of alkaline-resistant blocking solution

[0038] Preparation of the first blocking solution:

[0039] Weigh 4.24g of nickel acetate, 2.21g of sodium fluoride, and 5g of AEO-7, add the above components into 1L of deionized water in sequence, and obtain the first blocking solution after completely dissolving. The nickel ion concentration in the first blocking solution is 1g / L, the fluoride ion concentration is 1g / L, and the AEO-7 concentration is 5g / L.

[0040] Preparation of the second blocking solution:

[0041] Weigh 5g of sodium silicate, 3g of sodium lauryl sulfate, and 10g of sorbitol, and add the above components into 1L of deionized water in sequence, and obtain the second blocking solution after completely dissolving. The concentration of sodium silicate in the first blocking solution is 5g / L, the concentration of sodium lauryl sulfate is 3g / L, and the concentration of sorbitol is 10g / L.

[0042] 2) Sealing of oxide film on aluminum alloy surfac...

Embodiment 3

[0048] 1) Preparation of alkaline-resistant blocking solution

[0049] Preparation of the first blocking solution:

[0050] Weigh 4.24g of nickel acetate, 2.21g of sodium fluoride, and 5g of AEO-7, add the above components into 1L of deionized water in sequence, and obtain the first blocking solution after completely dissolving. The nickel ion concentration in the first blocking solution is 1g / L, the fluoride ion concentration is 1g / L, and the AEO-7 concentration is 5g / L.

[0051] Preparation of the second blocking solution:

[0052] Weigh 5g of sodium silicate, 3g of sodium lauryl sulfate, and 10g of sorbitol, and add the above components into 1L of deionized water in sequence, and obtain the second blocking solution after completely dissolving. The concentration of sodium silicate in the first blocking solution is 5g / L, the concentration of sodium lauryl sulfate is 3g / L, and the concentration of sorbitol is 10g / L.

[0053] 2) Sealing of oxide film on aluminum alloy surfac...

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PUM

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Abstract

The invention discloses alkali-resistant confining liquid. The alkali-resistant confining liquid comprises first confining liquid and second confining liquid, wherein the first confining liquid mainlycomprises the following components by concentration: 0.1-8 g / L of nickel ion, 0.1-10 g / L of fluorinion, and 1-15 g / L of a first surfactant; the second confining liquid mainly comprises the followingcomponents by concentration: 1.2-35 g / L of silicate, 3-5 g / L of a second surfactant, and 10-15 g / L of a dust inhibition agent. Compared with the prior art, the confining technology of an aluminum alloy surface oxide film is simple in method, and short in confining time; the confined aluminum alloy oxide film is smooth in surface; and the strong alkali resistance and the salt mist resistance are obviously improved.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to an alkali-resistant sealing solution and a sealing process for an oxide film on the surface of an aluminum alloy. Background technique [0002] With the continuous development of the manufacturing industry, the proportion of metal aluminum in the industrial field has been increasing, and it has become an important manufacturing material for mobile phones, computers, communications, and automobiles. Due to the diversity of environments faced by aluminum products during use, aluminum parts are required to have relatively good properties such as acid and alkali resistance, corrosion resistance, and weather resistance, especially alkali resistance (for example: during car cleaning, cleaning The pH value of the solution is between 10 and 14), therefore, the sealing treatment after anodizing of aluminum becomes particularly important. At present, the most widely used seali...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/24
CPCC25D11/246
Inventor 何友余吴育祥李德荣
Owner SHANGHAI LVTONG CHEM TECH CO LTD
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