ステンレス鋼表面酸化処理材の流動高温純水中への金属放出挙動

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タイトル別名
  • Metal Release Behavior of Surface Oxidized Stainless Steels into Flowing High Temperature Pure Water
  • ステンレス コウヒョウメン サンカ ショリザイ ノ リュウドウ コウオン ジュ
  • 表面酸化処理によるステンレス鋼の金属放出抑制に関する研究-第2報
  • Study on Inhibition of Metal Release by Surface Oxidation Treatment of Stainless Steels-The Second Report

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In order to clarify the effect of oxidation treatment of Type 304 SS on the inhibition of metal release into high temperature pure water, metal release rate of individual alloying element into flowing deionized water containing 50ppb dissolved oxygen was measured as the function of exposure time on representative specimens oxidized in air and steam. The behavior of metal release was also discussed in relation to the structure of surface films. Among the alloying elements the amount of Fe ion, Cr ion and Fe crud in high temperature pure water tended to saturate with the exposure time and that of Ni ion and Co ion tended to increase monotonously with the exposure time for all specimens tested. And the treatment of steamoxidation was the most effective to decrease the metal release of alloying elements and the treatment by air-oxidation also decreased the metal release. These tendencies were confirmed to correlate well with the structure of the surface films as it was in the results in the static autoclave test.

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