Effect of a small amount of Zn addition on the electrochemical properties of Al-0.1%Sn alloy

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  • TOHMA Ken
    Technical Research Laboratory Mitsubishi Aluminum Co., Ltd.
  • KUDO Hajime
    Technical Research Laboratory Mitsubishi Aluminum Co., Ltd.
  • TAKEUCHI Yo
    Technical Research Laboratory Mitsubishi Aluminum Co., Ltd.

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  • Ａｌ‐０．１％Ｓｎ合金の電気化学的性質に及ぼす微量亜鉛含有の効果
  • Al 0.1パーセント Sn ゴウキン ノ デンキ カガクテキ セイシツ ニ

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Abstract

Anodic polarization characteristics and corrosion resistance of Al-0.1%Sn alloys containing Zn up to 0.3% were examined in NaCl and AlCl3 solutions. Remarkably less noble characteristics and abnormally low corrosion resistance of solution treated Al-Sn alloys are greatly improved by an addition of Zn0.2% or more. Localized dissolution morphology of Al-Sn-Zn alloys is controlled mainly by dissolution potential, that is, canal-like and (100) type of crystallographic pits are observed in the solution treated and precipitation treated noble alloys respectively. Zn addition has little effect on the microstructure of Al-Sn alloys both solution treated and precipitation treated. A small amount of Zn addition is effective to improve electrochemical properties of Al-Sn alloys in practical use.

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