Sacrificial anode effect and corrosion resistance of aluminum alloy fin stock for automotive heat exchangers

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  • 自動車熱交換器用アルミニウム合金フィン材の犠牲陽極効果と耐食性
  • ジドウシャ ネツ コウカンキヨウ アルミニウム ゴウキン フィンザイ ノ ギセイ ヨウキョク コウカ ト タイショクセイ

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Abstract

Relation between sacrificial anode effect and corrosion resistance of fin stock for automotive heat exchangers has been investigated on Al–Mn–Zn alloys by SWAAT. Corrosion depth of tube diminished, in contrast, corrosion loss of fin increased with increasing Zn content in the alloy. Total corrosion mass loss of fin stocks was separated into mass loss due to sacrificial anode and self corrosion, respectively, by immersion corrosion test. Rate of mass loss due to self corrosion to the total was 30 to 50%, independently of Zn content of fin stocks. The results were discussed with electrochemical polarization curves. It was concluded that corrosion loss of fin stock is minimized by the optimization of Zn content according to necessary sacrificial anode effect.

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