Alの高温純水腐食に及ぼす添加元素の影響

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タイトル別名
  • Corrosion of Aluminum in Deionized Water at Elevated Temperatures. (On the Effect of Alloying Addition, 2nd Report)
  • Al ノ コウオン ジュンスイ フショク ニ オヨボス テンカ ゲンソ ノ エイキョウ

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The corrosion behaviours of several kinds of binary Al alloys are obeserved. As specimens, cast ingots and rolled sheets were employed to observe the relationship of corrosion attack and alloy structure. By the corrosion tests at 300°C, these alloys are classified in three categories from their corrosion behaviours. They are, (1) Alloys which are susceptible to the intergranular attack and accordingly do not show any delay in corrosion rate. (2) Alloys which are corroded uniformly and have 2 stages, namely the first stage of low corrosion rate and the second stage of linearly accelerated attack. In the latter step, they do not show intergranular attack but localized penetration on phase boundaries or primary phase. (3) Alloys which have low corrosion rate and never show rate transitions in the range of our testing period. These are the most resistant. The delay before the intiation of the second step in the alloys of category (2) is controlled by alloyed elements and their concentration. It is remarkable that the weight increase of these alloys at steady state is equivalently about 30 mg/dm2 in every alloy. After the corrosion rate transition, crystallization of boemite is observed by X-ray diffraction of corrosion products.

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