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Aluminum alloy alkaline Sn-Mo conversion liquid and aluminum alloy conversion treatment method

A conversion treatment, aluminum alloy technology, applied in the direction of metal material coating process, etc., can solve the problems of human body and environmental toxicity, achieve good discoloration resistance and corrosion resistance, good industrialization potential, and avoid the effect of acid mist

Inactive Publication Date: 2019-12-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the shortcomings and deficiencies of the prior art, the primary purpose of the present invention is to provide a chromium-free alkaline conversion solution for aluminum alloys, that is, an alkaline Sn-Mo conversion solution for aluminum alloys, so as to solve the harmful effects of the traditional hexavalent chromium conversion process on the human body. and environmental toxicity

Method used

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  • Aluminum alloy alkaline Sn-Mo conversion liquid and aluminum alloy conversion treatment method
  • Aluminum alloy alkaline Sn-Mo conversion liquid and aluminum alloy conversion treatment method
  • Aluminum alloy alkaline Sn-Mo conversion liquid and aluminum alloy conversion treatment method

Examples

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Effect test

Embodiment 1

[0033] (1) Preparation of a kind of aluminum alloy Sn-Mo alkaline conversion solution (taking 1 liter of solution as an example):

[0034] 1.5g of NaOH, 5.0g of NaOH 2 SnO 3 ·3H 2 O, 4.0 g Na 2 MoO 4 2H 2 O, and 3.0g of sodium citrate were added to 500ml of distilled water in turn (each raw material was completely dissolved before adding subsequent raw materials), dissolved and mixed; added distilled water 300ml, added solvent 3-methoxy-3-methyl-1- Butanol 15ml, stir evenly, add 1.0g potassium permanganate, stir to dissolve completely, add distilled water to 950ml, adjust pH value to 11.5, add water to 1000ml to obtain Sn-Mo alkaline chromium-free conversion liquid.

[0035] (2) an aluminum alloy alkaline conversion method, comprising the steps of:

[0036] (2-1) Substrate preparation: Cut the aluminum alloy (taking 6063 aluminum alloy as an example, it should be pointed out that the aluminum alloy described in the present invention includes but not limited to 6063 alumi...

Embodiment 2

[0041] (1) Preparation of a kind of aluminum alloy Sn-Mo alkaline conversion solution (taking 1 liter of solution as an example):

[0042] 2.2g of KOH, 9.0g of Na 2 SnO 3 ·3H 2 O, 8.0 g Na 2 MoO 4 2H 2 O, and 5.5g of potassium citrate were added to 500ml of distilled water in turn (each raw material was completely dissolved before adding subsequent raw materials), dissolved and mixed; add 300ml of distilled water, add solvent cyclohexanol 12ml, stir evenly, then add permanganese in turn Potassium chloride 0.5g, sodium hypochlorite 0.3g, add distilled water to 950ml, adjust the pH value to 12, add water to 1000ml to obtain the Sn-Mo alkaline chromium-free conversion solution.

[0043] (2) an aluminum alloy alkaline conversion method, comprising the steps of:

[0044] (2-1) base material preparation: same as embodiment 1

[0045] (2-2) Alkaline cleaning: Use a cleaning solution to carry out alkaline degreasing and decontamination cleaning of the polished aluminum alloy at...

Embodiment 3

[0049] (1) Preparation of a kind of aluminum alloy Sn-Mo alkaline conversion solution (taking 1 liter of solution as an example):

[0050] 1.8g of LiOH, 15.0g of Na 2 SnO 3 ·3H 2 O, 2.0 g Na 2 MoO 4 2H 2 O, and 8.0 g of sodium citrate were added to 500 ml of distilled water in turn (each raw material was completely dissolved before adding subsequent raw materials), dissolved and mixed; added distilled water 300 ml, added solvent 3-methoxy-3-methyl-1- 6ml each of butanol and cyclohexanol, stir evenly, then add 0.3g of potassium permanganate, 0.5g of sodium hypochlorite in turn, add distilled water to 950ml, adjust the pH value to 12.5, replenish water to 1000ml, and obtain Sn-Mo alkaline chromium-free Transformation solution.

[0051] (2) A kind of aluminum alloy alkaline conversion method comprises the steps:

[0052] (2-1) base material preparation: same as embodiment 1

[0053] (2-2) Alkaline cleaning: Use a cleaning solution to carry out alkaline degreasing and deco...

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Abstract

The invention belongs to the technical field of metal material surface treatment, and discloses an aluminum alloy alkaline Sn-Mo conversion liquid and an aluminum alloy conversion treatment method. The conversion liquid is obtained by adjusting the pH of chromium-free conversion liquid to be alkaline through an acid-base regulator, wherein the chromium-free conversion liquid is composed of stannate, molybdate, citrate, an oxidizing agent, a water-soluble hydroxide, an organic solvent and water. The conversion treatment method comprises the following steps that an aluminum alloy undergoes surface cleaning treatment and acid pickling treatment, the aluminum alloy is immersed in the conversion liquid to undergo conversion treatment after being cleaned, and after undergoing water washing and drying, the surface-converted aluminum alloy is obtained. Through conversion treatment, a conversion film is obtained on the surface of the aluminum alloy, the film layer is uniform, and good discoloration resistance and corrosion resistance are achieved. The conversion liquid is the alkaline chromium-free conversion liquid, is safe and environment-friendly, is simple and convenient in process operation, and has a good industrialization prospect.

Description

technical field [0001] The invention belongs to the technical field of surface treatment of metal materials, and in particular relates to an aluminum alloy alkaline chromium-free conversion liquid (Sn-Mo conversion liquid) and a conversion treatment method for aluminum alloys. Background technique [0002] Aluminum alloy is widely used in aerospace, mechanical equipment, home appliances, construction and other fields because of its high specific strength, good thermal and electrical conductivity, beautiful color, non-magnetic, non-brittle at low temperature, and easy processing and forming. Aluminum alloy is the most widely used non-ferrous metal material in the industrial field. However, the chemical properties of aluminum alloy are relatively active, and under natural conditions, its surface is easily oxidized to form an oxide film. The film layer has a certain protective effect on the substrate, but due to its limited thickness, it is easy to be damaged. In a humid atmos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/66
CPCC23C22/66
Inventor 穆松林陆岑郑佑馗杜军
Owner SOUTH CHINA UNIV OF TECH
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