Formation behavior of phosphoric acid-based chemical conversion films containing alkaline earth metals on magnesium alloy

Akinori Nakamura, Satoshi Oue, Hiroki Koga, Hiroaki Nakano

研究成果: ジャーナルへの寄稿記事

抄録

The phosphating of Mg alloy was performed in unagitated solutions containing 1 g·dm-3 of Mg, Ca, Sr, and Ba as alkaline earth metals (M) and 50 g·dm-3 of H3PO4 of pH 3 at 40°C for 3 min. The structure and formation behavior of the phosphate films were investigated. The X-ray diffraction patterns of phosphate films broadened irrespective of the type of alkaline earth metal, which was a characteristic of an amorphous structure. XPS analysis revealed that the valence of P in the phosphate films was pentavalent. The pH in the vicinity of the Mg alloy during the phosphating, as measured using an Sb microelectrode, was approximately 10.4, 11.4, 10.7, and 12.0 in the solutions containing Mg, Ca, Sr, and Ba, respectively. This shows that phosphoric acid dissociates to the third stage during the phosphating, and the phosphate films comprising M3(PO4)2 containing an alkaline earth metal are formed. The phosphating was successively performed in two types of solutions containing different alkaline earth metals, and the cross section was analyzed. As a result, it was determined that the new phosphate films were formed at the interface between the Mg alloy substrate and phosphate films, and the previously formed phosphate films were boosted in the films.

元の言語英語
ページ(範囲)1007-1013
ページ数7
ジャーナルMaterials Transactions
58
発行部数7
DOI
出版物ステータス出版済み - 1 1 2017

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Alkaline Earth Metals
Alkaline earth metals
alkaline earth metals
phosphoric acid
Phosphoric acid
magnesium alloys
Magnesium alloys
phosphates
Phosphates
Microelectrodes
Diffraction patterns
diffraction patterns
X ray photoelectron spectroscopy
valence
X ray diffraction

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

これを引用

Formation behavior of phosphoric acid-based chemical conversion films containing alkaline earth metals on magnesium alloy. / Nakamura, Akinori; Oue, Satoshi; Koga, Hiroki; Nakano, Hiroaki.

:: Materials Transactions, 巻 58, 番号 7, 01.01.2017, p. 1007-1013.

研究成果: ジャーナルへの寄稿記事

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AB - The phosphating of Mg alloy was performed in unagitated solutions containing 1 g·dm-3 of Mg, Ca, Sr, and Ba as alkaline earth metals (M) and 50 g·dm-3 of H3PO4 of pH 3 at 40°C for 3 min. The structure and formation behavior of the phosphate films were investigated. The X-ray diffraction patterns of phosphate films broadened irrespective of the type of alkaline earth metal, which was a characteristic of an amorphous structure. XPS analysis revealed that the valence of P in the phosphate films was pentavalent. The pH in the vicinity of the Mg alloy during the phosphating, as measured using an Sb microelectrode, was approximately 10.4, 11.4, 10.7, and 12.0 in the solutions containing Mg, Ca, Sr, and Ba, respectively. This shows that phosphoric acid dissociates to the third stage during the phosphating, and the phosphate films comprising M3(PO4)2 containing an alkaline earth metal are formed. The phosphating was successively performed in two types of solutions containing different alkaline earth metals, and the cross section was analyzed. As a result, it was determined that the new phosphate films were formed at the interface between the Mg alloy substrate and phosphate films, and the previously formed phosphate films were boosted in the films.

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