Role of corrosion products in the suppression of atmospheric corrosion of aluminum and its alloys

Zhenhua Dan, I. Muto, Nobuyoshi Hara

研究成果: Conference contribution

6 被引用数 (Scopus)

抄録

Atmospheric corrosion behaviors of aluminum and aluminum alloys were investigated through 18-month field exposure tests. The corrosion rates decreased with exposure time. The corrosion products formed in the first 3 months mainly consisted of basic aluminum chloride, basic aluminum sulfate and aluminum hydroxide. However, phase transformation took place during exposure and the corrosion products were composed of basic aluminum sulfate and aluminum hydroxide after 12-month exposure. The corrosion products played a key role of the suppression of the atmospheric corrosion on aluminum and its alloys. The membrane potential of basic aluminum sulfate in NaCl solutions indicated that this compound had a cation-selectivity. The sulfate-containing corrosion products prevent the penetration of chloride ions to protect the aluminum substrate. This is responsible for the observed decrease in corrosion rates after prolonged exposure to the atmosphere.

本文言語English
ホスト出版物のタイトルCorrosion (General) - 216th ECS Meeting
出版社Electrochemical Society Inc.
ページ23-33
ページ数11
37
ISBN(電子版)9781566778114
ISBN(印刷版)9781566778114
DOI
出版ステータスPublished - 2009

出版物シリーズ

名前ECS Transactions
番号37
25
ISSN(印刷版)1938-5862
ISSN(電子版)1938-6737

ASJC Scopus subject areas

  • 工学(全般)

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