Preparation of the Multiple Rare Earth Conversion Membrane Based on the Magnesium Alloy AZ91 and their Corrosion Resistance Performance

Abstract:

Chemical membrane coating method was adopted for AZ91 magnesium alloy surface to explore the preparation method for cerium (Ce) conversion membrane, lanthanum (La) conversion membrane and double rare earth conversion membrane. The methods such as Scanning Electron Microscope (SEM), Energy Spectrometer (EDS) and X-ray Crystallography (XRD) were introduced for the detection of conversion membrane. The experiment results revealed that the corrosion resistance of double rare earth conversion membrane would get strengthened firstly, and degraded later along with the prolongation of conversion time. The corrosion resistance from low to high of conversion membrane is cerium (Ce) conversion membrane < lanthanum (La) conversion membrane < double rare earth conversion membrane. Therefore, double rare earth conversion membrane is more effective to improve the corrosion resistance for magnesium alloy and its corrosion resistance is better than that of single rare earth conversion membrane.

• Periodical: Advanced Materials Research (Volume 549)
• Pages: 305-309
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.549.305
• Online since: July 2012
• Authors: Guo Hui Zhang, Can Can Li, Mei Li, Ying Zhang, Hao Ran Geng
• Keywords: AZ91 Magnesium Alloy, Chemical Conversion Membrane, Corrosion Resistance Protection, Pretreatment

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