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Preparing method for magnesium alloy environment-friendly corrosion resisting type ceramic conversion film

A technology of ceramic transformation and magnesium alloy, applied in the direction of metal material coating process, etc., can solve the problems of limited substrate protection performance, unable to meet the needs of magnesium alloy industrial application, weak research foundation of magnesium alloy, etc., and achieve easy control and stable film formation. , a wide range of effects

Inactive Publication Date: 2020-05-12
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this technology is mainly aimed at galvanized steel, aluminum and aluminum alloy substrates, and the research foundation for applying magnesium alloys is weak.
Moreover, the currently reported ceramic conversion coating (publication number CN103184446A) has a thickness of only 40-120 nm, which has limited protective performance on the substrate and cannot meet the industrial application requirements of magnesium alloys.

Method used

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  • Preparing method for magnesium alloy environment-friendly corrosion resisting type ceramic conversion film
  • Preparing method for magnesium alloy environment-friendly corrosion resisting type ceramic conversion film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In the present embodiment, the sample is a modified AZ80 magnesium alloy, and its specific steps are as follows:

[0039] (1) Pretreatment: the pretreatment solution is an aqueous solution of sodium hydroxide 50g / l and sodium silicate 20g / l, with a pH value of 12, soaked at room temperature for 5 minutes;

[0040] (2) Roughening treatment: the roughening treatment solution is an aqueous solution of citric acid 10g / l, DL-malic acid 10g / l, sodium fluoride 20g / l, pH value 3, soaking at room temperature for 1min;

[0041] (3) Homogenization treatment: the homogenization treatment solution is an aqueous solution of ammonium bifluoride 20g / l, alkylphenol polyoxyethylene ether 50mg / l, pH value 7, soaking at room temperature for 1min;

[0042] (4) Conversion treatment: the conversion treatment solution is potassium fluozirconate 5g / l, fluozirconate 5g / l, potassium manganate 8g / l, tannic acid 1g / l, γ-aminopropyltriethoxysilane 5g / l aqueous solution, temperature is 26°C, pH val...

Embodiment 2

[0044] In the present embodiment, the sample is a deformed AZ80 magnesium alloy, and its specific steps are as follows:

[0045] (1) Pre-treatment: the pre-treatment solution is an aqueous solution of 40 g / l sodium hydroxide and 40 g / l sodium silicate, with a pH value of 13, soaked at room temperature for 5 min;

[0046] (2) Roughening treatment: the roughening treatment solution is an aqueous solution of citric acid 10g / l, DL-malic acid 10g / l, hexamethylenetetramine 30g / l, pH value 4, soaking at room temperature for 1min;

[0047] (3) Homogenization treatment: the homogenization treatment solution is an aqueous solution of ammonium bifluoride 30g / l, alkylphenol polyoxyethylene ether 50mg / l, pH value 6, soaking at room temperature for 1min;

[0048] (4) Conversion treatment: the conversion treatment solution is potassium fluozirconate 10g / l, potassium fluotitanate 5g / l, ammonium molybdate 8g / l, phytic acid 1g / l, γ-aminopropyltriethoxysilane 1g / l aqueous solution, temperature...

Embodiment 3

[0050] In this embodiment, the sample is an extruded AZ31B magnesium alloy plate, and its specific steps are as follows:

[0051] (1) Pretreatment: the pretreatment solution is an aqueous solution of 40 g / l sodium hydroxide and 40 g / l sodium silicate, with a pH value of 11, soaked at room temperature for 5 minutes;

[0052] (2) Roughening treatment: the roughening treatment solution is an aqueous solution of 10 g / l of DL-malic acid, 10 g / l of lactic acid, and 20 g / l of sodium fluoride, with a pH value of 5, soaked at room temperature for 5 minutes;

[0053] (3) Homogenization treatment: the homogenization treatment solution is an aqueous solution of ammonium bifluoride 30g / l and sodium dodecylsulfonate 100mg / l, pH value 8, soaked at room temperature for 2min;

[0054] (4) Transformation treatment: The transformation treatment solution is 5g / l of fluozirconic acid, 5g / l of fluotitanic acid, 5g / l of potassium fluotitanate, 6g / l of potassium permanganate, 1g / l of cerium nitrate, ...

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Abstract

The invention relates to the field of magnesium alloy surface treatment, in particular to a preparing method of an environment-friendly corrosion resisting type ceramic conversion film applied to a magnesium alloy. The method comprises front treatment, roughening treatment, homogenizing treatment and conversion treatment. A conversion treatment solution comprises 2-20 g / l of zirconium titanate (salt), 2-20 g / l of an oxidizing agent and 0.5-10 g / l of a film forming addition agent, 0.1-5 g / l of a silane coupling agent is added, the balance is water, and the pH value of the conversion treatment solution needs to be adjusted to 2-5 before usage. Base body surface uniform film forming can be achieved under the normal temperature condition in a dipping or spraying manner, the corrosion resistingperformance of the environment-friendly corrosion resisting type ceramic conversion film is equivalent to a traditional phosphate conversion film, and the environment-friendly corrosion resisting type ceramic conversion film can be directly used or used for coating pretreatment and has good adhesive force with an organic coating. The technology operation is simple, cost is low, emission of phosphate, chromium, nickel and other pollution ions is avoided, and the preparing method is an environment-friendly surface treatment new method suitable for magnesium alloy industry production.

Description

technical field [0001] The invention relates to the field of magnesium alloy surface treatment, in particular to a method for preparing an environment-friendly and corrosion-resistant ceramic conversion film applied to magnesium alloys. Background technique [0002] Chemical conversion coating technology has the advantages of simple process, low cost, and high degree of automation, and is often used in the pre-painting treatment of metal workpieces. However, the traditional phosphating treatment solution contains a large amount of phosphate and heavy metal ions such as zinc, manganese, nickel, etc., which is harmful to the environment and human body. Under the dual drive of "environmental protection requirements + energy costs", enterprises urgently need environmentally friendly new chemical conversion processes to replace traditional phosphating technologies. Moreover, the chemical properties of magnesium alloy are active and easy to corrode, especially for workpieces with...

Claims

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Application Information

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IPC IPC(8): C23C22/40C23C22/57C23C22/78C23C22/73
CPCC23C22/40C23C22/57C23C22/73C23C22/78
Inventor 董凯辉宋影伟杨天园单大勇韩恩厚
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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