高温高圧の水および蒸気による2元銅合金の腐食の研究

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  • Corrosion of Binary Copper Alloys in High Temperature Water and Steam. (Study on Corrosion of Copper Alloys in High Temperature Water and Steam (1))
  • 高温高圧の水および蒸気による2元銅合金の腐蝕の研究
  • コウオン コウアツ ノ ミズ オヨビ ジョウキ ニ ヨル 2ゲン ドウ ゴウキン ノ フショク ノ ケンキュウ

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An investigation has been made of corrosion of some binary copper alloys by high temperature water and steam under saturated pressure, 86 kg/cm2, at 300°C for 250 hours, using autoclave. Binary copper alloys containing aluminium (1, 6, 10%) silicon (1, 3, 4%), manganese (1, 5, 9%), nickel (5, 8, 15%) and tin (2, 6, 12%) were used as-rolled and annealed strip. After the corrosion test had been made, tensile tests and microscopical examination were performed and the following results were obtained. (1) Decreasing of tensile strength and elongation was remarkable on Cu-Al and Cu-Si alloys with increasing alloying element by severe intergranular corrosion. (2) Dealuminization corrosion of β′ and δ phase was observed on Cu-Al alloys of binary phase (α+β′,α+δ). (3) On the other hand, Cu-Mn, Cu-Ni and Cu-Sn alloys suffered no significant loss in tensile strength and elongation as a result of corrosion, but a little susceptibility to intergranular corrosion of Cu-Mn and Cu-Ni alloys was recognized from the microscopical examination of rolled surface of the specimens after tensile tests, due to intergranular parting. (4) Comparing corrosive action of saturated water with that of saturated steam, it was considered that the former was more corrosive that the latter.

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