Microstructures and corrosion resistance of surface layers formed on fluoride-treated magnesium alloys

• YAMAMOTO Atsushi

  Graduate School of Engineering, University of Hyogo

• INAOKA Hidekazu

  Graduate Student, University of Hyogo

• TSUBAKINO Harushige

  Graduate School of Engineering, University of Hyogo

Bibliographic Information

Other Title

• ふっ化物処理を施した種々のマグネシウム合金の表面層組織と耐食性
• フッカブツ ショリ オ ホドコシタ シュジュ ノ マグネシウム ゴウキン ノ ヒョウメンソウ ソシキ ト タイショクセイ

Abstract

A fluoride-treatment has been applied to various magnesium alloys, such as 3N-Mg, AZ31, AZ61, AZ91E and Ca-added AM60 alloys. The specimens of the alloys are dipped into molten NaBF₄ at 673 to 723 K for 0.3 to 86.4 ks. Surfaces of the specimens were successfully coated with surface layer by the treatment. Diffraction measurement in the synchrotron radiation facility SPring-8, BL-24XU (Hyogo prefecture beam line) showed that the surface layer was composed of NaMgF₃ and MgF₂ phases. The surface fluoride layer exhibits a superior corrosion resistance even in an immersion test using a 1% HNO₃ solution, filiform-like corrosion was suppressed for 1 to 3 ks in the solution depending on the alloy. Aluminum contents in the substrate alloys would affect the corrosion resistance by changing the microstructures in the fluoride layer.

Journal

• Journal of Japan Institute of Light Metals

  Journal of Japan Institute of Light Metals 57 (2), 57-61, 2007

  The Japan Institute of Light Metals

Keywords

• magnesium alloy
• texture
• hot-press
• mechanical properties
• anisotropy

Details

• CRID: 1390282681317021056
• NII Article ID: 10018729260
• NII Book ID: AN00069773
• DOI: 10.2464/jilm.57.57
• ISSN: 18808018
• ISSN: 04515994
• NDL BIB ID: 8722510
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I8722510
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed