Corrosion Resistance of Surface Treated AZ91D Magnesium Alloys Outdoor Exposure after 10 Years

Abstract:

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The high-purity magnesium alloy specimens prepared by applying die-cast [1] paint and various types of surface treatments, and then the corrosion resistance of practical coating materials after ten-year outdoor exposure tests was evaluated. These tests were performed at the Choshi (long. 140°45' E, lat. 35°43' N), the Asahikawa (long. 142°18' E, lat. 43°47' N), and the Miyakojima (long. 125°20' E, lat. 24°44' N) Exposure Laboratories of the Japan Weathering Test Center. The environmental factors generally believed to be associated with corrosion mechanisms (temperature, humidity, precipitation, wetness time, solar and UV radiation, and concentration of chloride and sulfur oxide) were measured. Evaluation of the adhesion of paint and corrosion resistance, chromate and anodic oxide films were superior as pretreatment paint films on AZ91D magnesium alloys; these films were comparable to paint-coated ADC12 aluminum alloys.

Info:

Periodical:

Materials Science Forum (Volumes 488-489)

Edited by:

W.Ke, E.H.Han, Y.F.Han, K.Kainer and A.A.Luo

Pages:

801-804

DOI:

10.4028/www.scientific.net/MSF.488-489.801

Citation:

K. Nishinaka et al., "Corrosion Resistance of Surface Treated AZ91D Magnesium Alloys Outdoor Exposure after 10 Years", Materials Science Forum, Vols. 488-489, pp. 801-804, 2005

Online since:

July 2005

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Price:

$35.00

[1] The Japan Magnesium Association: Handbook of Advance Magnesium Technology (kallos publishing, Japan 2000).

[2] N. Umehara: Research on the surface treatment of magnesium alloys and corrosion resistance (National Institute of Advanced Industrial Science and Technology, Japan 2000).

[3] The Small and Medium Enterprise Agency, Bureau of Economy, Trade and Industry, National Institute of Advanced Industrial Science and Technology: Development of advanced functional technology for magnesium alloys (Japan 2000).

[4] The Japan Magnesium Commission: Magnesium Manual 83 (The Japan Light Metal Association 1983).

[5] Processes for corrosion protection of magnesium alloys JIS H8651 (Japanese Standards Association 1995).

[6] The society for surface treatment research of aluminum die-cast: A research report concerning surface treatment of aluminum alloy die-cast (ADC12) (Nisseieburo co. ltd,. 2000).

[7] The Japan Magnesium Commission: Magnesium Manual 86 (The Japan Light Metal Association 1986).

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