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Process for magnesium alloy surface treatment

A surface treatment, magnesium alloy technology, applied in the direction of metal material coating technology, etc., can solve the problem that the degree of corrosion resistance may not meet the requirements, and achieve the effects of strong environmental friendliness, low energy consumption, and low chemical oxidation temperature

Inactive Publication Date: 2005-06-29
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the degree of corrosion resistance is not necessarily satisfactory, so further improvement is required

Method used

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  • Process for magnesium alloy surface treatment
  • Process for magnesium alloy surface treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Magnesium alloy sample: AZ91 magnesium alloy

[0036] Potassium permanganate [KMnO 4 ] 20g / L

[0037] Zirconium sulfate [Zr(SO 4 ) 2 ] 1.5g / L

[0038] Cerium nitrate [Ce(NO 3 ) 3 ·6H 2 O] 0.5g / L

[0039] Oxidation process: 298K, 8min

[0040] The quality of the film layer is brownish red continuous film layer, dripping time is 24s, and the paint film adhesion is 100 points.

Embodiment 2

[0042] Magnesium alloy sample: ZM61 magnesium alloy

[0043] Potassium permanganate [KMnO 4 ] 30g / L

[0044] Zirconium sulfate [Zr(SO 4 ) 2 ] 1.0g / L

[0045] Cerium nitrate [Ce(NO 3 ) 3 ·6H 2 O] 0.5g / L

[0046] Lanthanum nitrate [La(NO 3 ) 3 ] 0.5g / L

[0047] Oxidation process: 298K, 8min

[0048] The quality of the film layer is brownish red continuous film layer, the drip time is 25s, and the paint film adhesion is 100 points.

Embodiment 3

[0050] Magnesium alloy sample: AZ31 magnesium alloy

[0051] Potassium permanganate [KMnO 4 ] 40g / L

[0052] Zirconium sulfate [Zr(SO 4 ) 2 ] 0.5g / L

[0053] Cerium nitrate [Ce(NO 3 ) 3 ·6H 2 O] 1.0 / L

[0054] Lanthanum nitrate [La(NO 3 ) 3 ] 0.5g / L

[0055] Oxidation process: 298K, 8min

[0056] Film quality, brown-red continuous film, drip time 22s, paint film adhesion 100 points.

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Abstract

A magnesium alloy surface treatment method belongs to the technical field of magnesium alloy surface treatment. The process flow includes degreasing, chemical oxidation, post-treatment and water washing between each process; the chemical oxidation solution used in the chemical oxidation process contains permanganate, and its concentration converted into KMnO4 is 1-60g / L, containing The concentration of the rare earth salt converted into Ce(NO3) 3 6H2O is 0.01-50g / L, and the concentration of the film-forming aid contained in the conversion into Zr(SO4) 2 is 0.005-30g / L; the temperature of the chemical oxidation solution It is 273 ~ 363K, and the chemical oxidation treatment time is 0.3 ~ 30min. The chemical oxidation solution can form a conversion film on the surface of the magnesium alloy at normal temperature, the film layer is dense, the corrosion resistance is good, and the bonding force with the paint film is good. It is suitable for short-term anticorrosion during pre-painting treatment and transportation and storage.

Description

technical field [0001] The invention belongs to the technical field of surface treatment of magnesium alloys. In particular, it relates to a method for surface treatment of magnesium alloys by using a treatment solution not containing harmful hexavalent chromium. Background technique [0002] In recent years, magnesium alloy, as a lightweight alloy, has been widely used in automobile, aviation, electronics and other industries due to its unique advantages. In the aviation industry, magnesium alloys are used to manufacture more than a dozen components such as aircraft, engine parts, helicopter gearboxes, cockpit frames, and engine frames. In the automotive industry, magnesium alloys are mainly used to manufacture clutch housings, steering column frames, brake pedal brackets, valve covers, valve plates, instrument panel brackets, transmission bodies, window motor housings, oil filter joints, engine front covers, Auto parts such as intake manifolds, mirror covers, accessory b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/57C23C22/68C23C22/78C23C22/82
Inventor 梁成浩郑润芬
Owner DALIAN UNIV OF TECH
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