Structure and Formation Mechanism of Surface Films Formed on Magnesium Die Cast AZ91D by Chemical Conversion Coating.

• ONO Sachiko

  Adv. Res. Center for Sci. and Eng., Waseda Univ.

• SAITO Makoto

  Ebina Denka Kogyo Co., Ltd.

• HORIGUCHI Makoto

  Corp. Res. & Dev., Toyo Seikan Group

• TERASHIMA Keiichi

  Chiba Inst. of Tech.

• MATSUSAKA Kikuo

  Former: Corp. Res. & Dev. Toyo Seikan Group

• SHIDA Azusa

  Yokohama City Center for Ind. Tech. & Design

• OSAKA Tetsuya

  Adv. Res. Center for Sci. and Eng., Waseda Univ. School of Sci. and Eng., Waseda Univ.

• MASUKO Noboru

  Chiba Inst. of Tech.

Bibliographic Information

Other Title

• マグネシウムダイカストＡＺ９１Ｄの化成処理により成長した表面皮膜の構造と生成機構
• マグネシウム ダイカスト AZ91D ノ カセイ ショリ ニ ヨリ セイチョウ

Abstract

The structure and the formation mechanism of surface oxide films grown on magnesium die cast AZ91D have been studied. The substrate surface after chemical etching shows grains of Mg solid solution matrix of several μm in size with Mg₁₇Al₁₂ compound at grain boundaries, large and small voids, and cavities between the grains. The film surface after chemical conversion coating has a granular structure, with each granule corresponding to a single grain. Direct cross sectional observation revealed that the film was formed by anodic reaction and had a porous cell structure which was separated from the substrate by a thin barrier layer at the film/metal interface. The porous film is composed of cell colonies in the sub-micron range that have branched fine pores, with central holes (mother pores) sized approximately 50nm. Square shaped holes about 300nm in size observed on the film surface are believed to be cathodic sites.

Journal

• Journal of The Surface Finishing Society of Japan

  Journal of The Surface Finishing Society of Japan 47 (3), 263-267, 1996

  The Surface Finishing Society of Japan

Keywords

• Magnesium Die Cast
• Chemical Conversion Coating
• TEM
• Film Structure

Details

• CRID: 1390001204113645568
• NII Article ID: 10002255914
• NII Book ID: AN1005202X
• DOI: 10.4139/sfj.47.263
• COI: 1:CAS:528:DyaK28XhvFCqtbg%3D
• ISSN: 18843409
• ISSN: 09151869
• ISSN: http://id.crossref.org/issn/09151869
• NDL BIB ID: 3936741
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I3936741
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed