Normal-temperature alkaline chromium-free passivation solution and passivation method for aluminum alloy

A chromium-free passivation, aluminum alloy technology, applied in the direction of metal material coating process, etc., to achieve the effects of simple process operation, good discoloration resistance, and low cost

Active Publication Date: 2016-05-25
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The passivation solution is environmentally friendly, which not only solves the toxicity problem of the traditional hexavalent chromium process, but also has high efficiency and energy saving

Method used

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  • Normal-temperature alkaline chromium-free passivation solution and passivation method for aluminum alloy
  • Normal-temperature alkaline chromium-free passivation solution and passivation method for aluminum alloy
  • Normal-temperature alkaline chromium-free passivation solution and passivation method for aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Preparation of a chromium-free alkaline passivation solution for aluminum alloys, taking the preparation of 1000mL passivation solution as an example:

[0037] Add about 800mL of distilled water to the beaker, and dissolve 30.0g of Na 2 MoO 4 2H 2O, the EDTA-2Na of 5.0g, the triethanolamine of 5.0g, the hydrogen peroxide (30wt%) of 1.0g, the potassium permanganate of 2.0g, the NaF of 1.0g and the APG0810 of 0.02g add in distilled water successively (each raw material adds and after completely dissolving, then add subsequent components), dissolve and mix well, add water to about 950mL; =10.5, add distilled water to 1000mL to obtain an aluminum alloy alkaline chromium-free passivation solution. Na in the passivation solution 2 MoO 4 2H 2 The concentration of O is 30.0g / L, the concentration of EDTA-2Na is 5.0g / L, the concentration of triethanolamine is 5.0g / L, the concentration of hydrogen peroxide is 1.0g / L, and the concentration of potassium permanganate is 2.0...

Embodiment 2

[0045] (1) The preparation of an aluminum alloy alkaline chromium-free passivation solution, taking the preparation of 1000mL passivation solution as an example:

[0046] Add about 800mL of distilled water to the beaker, dissolve 45.0g of Na 2 MoO 4 2H 2 O, the EDTA-2Na of 6.0g, the triethanolamine of 6.0g, the sodium persulfate of 2.0g, the potassium permanganate of 3.0g, the KF of 1.5g and the CAB-35 of 0.08g add in distilled water successively (every kind of raw material adds and after completely dissolving, then add subsequent components), dissolve and mix well, add water to about 950mL; =10.0, add distilled water to 1000mL, promptly obtain aluminum alloy alkaline chromium-free passivation solution; Na in the passivation solution 2 MoO 4 2H 2 The concentration of O is 45.0g / L, the concentration of EDTA-2Na is 6.0g / L, the concentration of triethanolamine is 6.0g / L, the concentration of sodium persulfate is 2.0g / L, and the concentration of potassium permanganate is 3.0g...

Embodiment 3

[0053] (1) Preparation of a chromium-free alkaline passivation solution for aluminum alloys, taking the preparation of 1000mL passivation solution as an example:

[0054] Add about 800mL of distilled water to the beaker, and dissolve 50.0g of Na 2 MoO 4 2H 2 O, K 5.0 g 2 MoO 4 , 8.0g of EDTA-2Na, 6.0g of sodium tetraborate, 2.0g of sodium hypochlorite, 4.0g of potassium permanganate, 2.5g of KF, and 0.2g of FMEE were added to distilled water in sequence (each raw material was added and completely dissolved After that, add subsequent components), dissolve and mix, add water to about 950mL; use acid-base regulator (1.0wt% NaOH solution or 1.0wt% HF solution) to adjust the pH value of the solution so that pH=9.8, Add distilled water to 1000mL to obtain the aluminum alloy alkaline chromium-free passivation solution; Na in the passivation solution 2 MoO 4 2H 2 The concentration of O is 50.0g / L, K 2 MoO 4 The concentration of EDTA-2Na is 5.0g / L, the concentration of EDTA-2N...

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Abstract

The invention belongs to the technical field of surface treatment on metal materials, and discloses normal-temperature alkaline chromium-free passivation solution and a passivation method for aluminum alloy. PH (potential of hydrogen) of chromium-free passivation solution is regulated by the aid of acid-alkali regulators until the chromium-free passivation solution is alkaline; the chromium-free passivation solution comprises molybdate, complexing agents, oxidizing agents, film-forming accelerators, surfactants and water. The passivation method includes carrying out alkali washing on the aluminum alloy and removing oil and dirt from the aluminum alloy; cleaning the aluminum alloy, then carrying out acid washing on the aluminum alloy and activating the aluminum alloy; cleaning the aluminum alloy, carrying out normal-temperature passivation treatment on the aluminum alloy, washing the aluminum alloy by the aid of water, drying the aluminum alloy by means of blowing or drying the aluminum alloy by the aid of ovens to obtain aluminum alloy passivation films. The normal-temperature alkaline chromium-free passivation solution and the passivation method have the advantages that the passivation films can grow fast and are excellent in discoloration resistance and corrosion resistance; various components of the normal-temperature alkaline chromium-free passivation solution are stable in chemical properties, accordingly, the normal-temperature alkaline chromium-free passivation solution is convenient to store and transport, low in cost and high in efficiency, processes are easy and convenient to implement, the aluminum alloy can be treated at the normal temperature, energy can be saved, and industrialization is easy to implement.

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 normal temperature alkaline chromium-free passivation solution and an aluminum alloy passivation method. 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, good plasticity, and no low-temperature brittleness. Its consumption is second only to steel, and it is the second most used metal material in the industrial field. However, the chemical properties of aluminum alloy are relatively active. In the atmospheric environment, an extremely thin oxide film (usually a few nanometers in thickness) is easily formed on the surface of the aluminum alloy, which has a certain protective effect on the substrate. However, the natural ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/66
CPCC23C22/66
Inventor 穆松林温炜成许垂康李文芳杜军
Owner SOUTH CHINA UNIV OF TECH
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