Improving the pitting corrosion resistance of aa1050 aluminum by removing intermetallic particles during conversion treatments

Hiroshi Kakinuma, Izumi Muto, Yoshiyuki Oya, Takahiro Momii, Yu Sugawara, Nobuyoshi Hara

研究成果: Article査読

抄録

Measurements of the open circuit potential of AA1050 were performed in 10mM CrO3, and the Al-matrix around the intermetallic particles was found to dissolve locally. Pre-immersion in 1M NaOH promoted the dissolution of the Al-matrix around intermetallic particles, resulting in the improvement of pitting corrosion resistance in NaCl solutions. The pitting corrosion resistance provided by molybdate treatment is effectively improved by pre-immersion in NaOH. The maximum pit depth of the specimen treated in MoO3HNO3 solution after preimmersion in 1M NaOH was small compared to the chromate-treated specimen. It was determined that immersion in an acidic solution containing an inhibitor after pre-immersion in NaOH is an effective method to improve the pitting corrosion resistance of aluminum alloys.

本文言語English
ページ(範囲)1160-1167
ページ数8
ジャーナルMaterials Transactions
62
8
DOI
出版ステータスPublished - 2021

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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