高温高圧の水および蒸気によるαアルミニウム青銅の腐食とそれにおよぼす添加元素の効果について

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タイトル別名
  • Corrosion of Alpha Aluminium Bronze and its Modifications with Various Additional Elements by High Temperature Water and Steam. (Study on Corrosion of Copper Alloys in High Temperature Water and Steam (3))
  • コウオン コウアツ ノ ミズ オヨビ ジョウキ ニ ヨル アルファ アルミニウム セイドウ ノ フショク ト ソレニ オヨボス テンカ ゲンソ ノ コウカ ニ ツイテ

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抄録

An investigation has been made on corrosion of alpha aluminium bronze by high temperature water and steam. The copper alloys containing 7%Al and small amounts of various elements were used as annealed strip. The specimens were set in autoclave and exposed to saturated water and steam at 300°C. After the exposure for 250 hours, determination of weight gain, tensile test, microscopical examination and X-ray analysis of corrosion product were performed. The following results were obtained. (1) The weight gain, the loss in tensile strength and elongation due to intergranular corrosion were determined on all specimens. (2) The corrosion product formed on the specimens was a mixture of metallic copper and Böhmite (α-Al2O3 H2O). This fact shows that the aluminium atoms near the grain boundary were selectively oxidized by high temperature water and steam. (3) Addition of small amount of arsenic or antimony to alloy greatly promotes the corrosion. For example, the penetration depth of intergranular corrosion of Cu-7%Al-0.34%As alloy was more than 250 μ but that of Cu-7%Al alloy was about 30 μ. (4) Tin is the only element which can reduce the rate of intergranular corrosion but it can not inhibit the corrosion completely. (5) Addition of small amount of Mn, P, Ag, Fe, Ni, Si, Ti, Zr, Cr, Zn, Ca and Cd have no appreciable effect on corrosion.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 25 (7), 471-475, 1961

    公益社団法人 日本金属学会

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