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Manganese-titanium serial chromium-free passivation liquid on surface of aluminum alloy and passivation method thereof

An aluminum alloy surface, chromium-free passivation technology, applied in the direction of metal material coating technology, can solve the problems of difficult control of the production process, high production cost, high processing temperature, and achieve improved corrosion resistance, simple use process, enhanced The effect of adhesion

Active Publication Date: 2014-03-26
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the chemical conversion coating is very thin (≤100mg / m 2 ), it is difficult to meet the requirements of architectural aluminum profiles; and the conversion film is a colorless film, it is difficult to judge the quality of the film online; the production process is difficult to control
Although the rare earth chemical conversion coating has good corrosion resistance, it has disadvantages such as long treatment time, high treatment temperature, complicated treatment process, and high production cost, and has a certain distance from industrial production.

Method used

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  • Manganese-titanium serial chromium-free passivation liquid on surface of aluminum alloy and passivation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Degrease, descale, activate and clean the workpiece made of aluminum alloy;

[0035] (2) Passivation solution configuration, weigh 1g titanyl sulfate, 2g concentrated sulfuric acid, 5g potassium permanganate, 2g urea, 0.5g sodium fluoride, 0.2g sodium lauryl sulfate, add 400ml deionized water to dissolve, Use 160 g / L sodium hydroxide solution to adjust the pH to 2.5, add enough deionized water to adjust the total volume of the solution to 1 L, mix well, and obtain the aluminum alloy chromium-free passivation treatment solution of this embodiment.

[0036] (3) Dip the aluminum alloy workpiece treated in step (1) into the passivation solution obtained in step (2) for passivation, maintain the temperature of the passivation solution at 50°C, and soak for 10 minutes;

[0037] (4) After the passivation is completed, take it out for cleaning and dry or dry it.

Embodiment 2

[0039] (1) Degrease, descale, activate and clean the workpiece made of aluminum alloy;

[0040] (2) Passivation solution configuration, weigh 2g of titanyl sulfate, 3g of concentrated sulfuric acid, 6g of potassium permanganate, 1g of urea, 0.3g of sodium fluoride, 0.1g of sodium lauryl sulfate, add 400ml of deionized water to dissolve, Use 160 g / L sodium hydroxide solution to adjust the pH to 2.7, add enough deionized water to adjust the total volume of the solution to 1 L, mix well, and obtain the aluminum alloy chromium-free passivation treatment solution of this embodiment.

[0041] (3) Dip the aluminum alloy workpiece treated in step (1) into the passivation solution obtained in step (2) for passivation, maintain the temperature of the passivation solution at 60°C, and soak for 10 minutes;

[0042] (4) After the passivation is completed, take it out for cleaning and dry or dry it.

Embodiment 3

[0044] (1) Degrease, descale, activate and clean the workpiece made of aluminum alloy;

[0045] (2) Passivation solution configuration, weigh 3g titanyl sulfate, 4g concentrated sulfuric acid, 4g potassium permanganate, 0.5g urea, 0.1g sodium fluoride, 0.1g sodium lauryl sulfate, add 400ml deionized water to dissolve , using 160 g / L sodium hydroxide solution to adjust the pH to 2.8, adding sufficient deionized water to make the total volume of the solution to 1 L, and mixing evenly to obtain the aluminum alloy chromium-free passivation treatment solution of this embodiment.

[0046] (3) Dip the aluminum alloy workpiece treated in step (1) into the passivation solution obtained in step (2) for passivation, maintain the temperature of the passivation solution at 50°C, and soak for 20 minutes;

[0047] (4) After the passivation is completed, take it out for cleaning and dry or dry it.

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Abstract

The invention relates to a manganese-titanium serial chromium-free passivation liquid on the surface of an aluminum alloy and a method of passivating by using the passivation liquid. The passivation liquid contains titanium salt and permanganate. The manganese-titanium serial chromium-free passivation treatment method comprises the following steps: after grease on the surface of the aluminum alloy is removed, alkali washing, deoxygenating and activating; and dipping or spraying the aluminum alloy for passivation treatment. According to the manganese-titanium serial chromium-free passivation treatment method provided by the invention, a yellow chemical conversion film with stronger corrosion resistance can be formed on the surface of the aluminum alloy, so that the product quality can be observed online conveniently, so that the method has the advantages of simplicity in operation, low cost, no chromium pollution and the like.

Description

technical field [0001] The invention relates to the field of metal surface treatment, in particular to a manganese-titanium chromium-free passivation solution on the surface of an aluminum alloy and a passivation method using the passivation solution. Background technique [0002] Aluminum alloy is a general term for aluminum-based alloys. The main alloying elements are copper, silicon, magnesium, zinc, and manganese, and the secondary alloying elements are nickel, iron, titanium, chromium, and lithium. Aluminum alloy is currently the largest and most widely used non-ferrous metal in the world. Because of its excellent physical and chemical properties, it is widely used in construction, transportation, machinery manufacturing, electronics, packaging materials, electric power, daily necessities and other fields. However, aluminum alloys are prone to corrosion damage when used in humid, industrial gas, fuel gas, salt and dust atmospheres, which shortens their service life. I...

Claims

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Application Information

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IPC IPC(8): C23C22/56C23C22/34C23C22/36C23C22/07
Inventor 刘庆芬黄啸竹张超
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI