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Method for preparing magnesium lithium alloy cerium salt and molybdate-phosphate-zirconium fluoride conversion coating

A magnesium-lithium alloy and molybdate technology, which is applied in the coating process of metal materials, can solve the problems of fast solution consumption, unevenness, and thin film layer, and achieve good anti-corrosion effect, good bonding, and uniform film layer Effect

Inactive Publication Date: 2011-09-28
HARBIN ENG UNIV
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Problems solved by technology

[0003] Most of the currently researched chromium-free conversion treatment solutions for magnesium alloys are still in the laboratory stage, and often have the disadvantages of fast solution consumption, easy precipitation or long treatment time, and the formed film is thin, loose and uneven. Suitable for batch processing of workpieces, there are very few practical processes

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  • Method for preparing magnesium lithium alloy cerium salt and molybdate-phosphate-zirconium fluoride conversion coating
  • Method for preparing magnesium lithium alloy cerium salt and molybdate-phosphate-zirconium fluoride conversion coating
  • Method for preparing magnesium lithium alloy cerium salt and molybdate-phosphate-zirconium fluoride conversion coating

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Embodiment Construction

[0029] The following examples describe the present invention in more detail:

[0030] After degreasing, pickling, and activation, the magnesium-lithium alloy undergoes cerium salt conversion, and a layer of rare earth conversion film is first formed on the surface of the magnesium-lithium alloy. The process condition of cerium salt conversion is:

[0031] The preparation method of cerium salt conversion solution is as follows:

[0032] (1) weigh 8g / L cerium nitrate, dissolve;

[0033] (2) weigh 10g / L citric acid, dissolve;

[0034] (3) weigh 2g / L sodium lauryl sulfate, dissolve;

[0035] (4) weigh 0.2g / L thiourea, dissolve;

[0036] (5) weigh 0.05g / L sodium fluoride, dissolve;

[0037] (6) Weigh 10mL / L of hydrogen peroxide;

[0038] (7) Add solutions (2) and (3) to solution (1) under stirring conditions;

[0039] (8) under stirring conditions, adding solutions (4), (5) to the solution formed in step (7);

[0040] (9) Add solution (6) to the solution formed in step (8) ...

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Abstract

The invention provides a method for preparing magnesium lithium alloy cerium salt and molybdate-phosphate-zirconium fluoride conversion coating, which comprises: subjecting the magnesium lithium alloy to degreasing, pickling and activating; performing conversion by cerium salt for 10 to 15 minutes in cerium salt conversion solution under conditions of a pH value of 3 to 4 and a temperature of 40 DEG C, and forming a layer of rare earth conversion coating on the surface of the magnesium lithium alloy; and immersing in molybdate-phosphate-zirconium fluoride conversion solution to perform conversion for 12 to 15 minutes under conditions of a pH value of 3.7 to 3.8 and a temperature of 50 to 55 DEG C. The method has better anticorrosion effect and is environment friendly; the bonding force between the conversion coating and the substrate is high; the color of the conversion film is uniform; the anticorrosion performance is high; and the obtained molybdate-phosphate-zirconium fluoride conversion solution has high recycling value and long service life and can be better reduce production and application cost.

Description

technical field [0001] The invention relates to a preparation method for forming a conversion film on the surface of a magnesium-lithium alloy. Background technique [0002] At present, more research work on the surface modification of magnesium alloys mainly includes surface alloying, vapor deposition coating, laser treatment, metal coating, anodic oxidation, chemical conversion coating and other methods. Chemical conversion coatings have the advantages of simple operation, low cost, and wide adaptability. The existing chemical conversions commonly used include chromate conversion, phosphate conversion, molybdate conversion, permanganate conversion, rare earth metal salt conversion, tin Salt transformation and organic chemical transformation, etc. The representative chemical conversion treatment is chromate conversion, and the chromate conversion treatment mainly uses chromic anhydride or dichromate as the main component solution for chemical treatment. Because hexavalent...

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Application Information

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IPC IPC(8): C23C22/34C23C22/44
Inventor 黄晓梅田静
Owner HARBIN ENG UNIV
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