THE NEW TECHNOLOGY OF THE ANODIC OXIDATION APPLIED TO AZ91D ALLOY

J Chin Soc Corr Pro

2003, Vol. 23

Issue (5): 286-289 DOI:

Research Report

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THE NEW TECHNOLOGY OF THE ANODIC OXIDATION APPLIED TO AZ91D ALLOY

Henan Wang;Hongwei Huo;Ying Li

中科院金属所

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Henan Wang; Hongwei Huo; Ying Li. THE NEW TECHNOLOGY OF THE ANODIC OXIDATION APPLIED TO AZ91D ALLOY. J Chin Soc Corr Pro, 2003, 23(5): 286-289 .

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Abstract A suitable mixture without chromium is developed for protection of mag nesium alloys by treatment with the anodic oxidation.The aqueous solution is co mposed of NaOH、Na2SiF6 and an organic additive.The potentiodynamic polariza tio n measurement showed that the film had outstanding protective ability in 3.5% Na Cl solution.The morphology and component of the anodic oxidation film have been analysed by SEM,XRD,XPS and EPMA respectively.XRD and EPMA analysis revealed that the film was made of MgO、MgAl2O4 and 2Al2O3·2SiO2·H2O.Si and Al oxides make up the volume shrinkage of magnesium oxides,so that the film has no crack which provides a good condition against pitting.And the even dispersio ns of Si and Al in the film is another factor that the film has better protectio n.

Key words: magnesium alloy anodic oxidation treatment corrosion resistance

Received: 17 May 2002

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