チオシアン酸アンモニウム水溶液中におけるPC鋼棒の水素吸蔵挙動 Hydrogen Absorption Behavior of Steel Bar for Prestressed Concrete in a Solution of Ammonium Thiocyanate

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抄録

チオシアン酸アンモニウム水溶液浸漬によるPC鋼棒の水素吸蔵挙動を明らかにするため,水素存在状態,酸化皮膜,比液量,浸漬時間,溶液温度の影響について検討した.本溶液の特徴は,浸漬時間とともに水素量が増加し,ピークに達した後,一定で保持されずに減少する.この水素量減少の主要因は,PC鋼棒表面に形成される腐食生成物である.また,腐食に伴うpHの上昇などの溶液の経時変化もわずかであるが水素量減少に影響を及ぼす.

A solution of ammonium thiocyanate is used in the FIP (Fédération International de la Précontrainte) test as a hydrogen charging method. Though this method is comparatively simple, fracture time in the FIP test and hydrogen content often differ among various testing institutes. However, the detailed hydrogen absorption behavior in the solution is still not clear. In this context, the effects of existing states of hydrogen, oxide film on the specimen surface, specific solution volume to specimen surface area, immersion time and solution temperature on the hydrogen absorption behavior of a steel bar for reinforcing prestressed concrete were investigated by immersing it in the solution. The amount of absorbed hydrogen increased with immersion time, reached its maximum, and then decreased with increasing immersion time. A main factor of the decrease in the amount of absorbed hydrogen was corrosion products, including Fe, O and S, formed on the specimen surface, since the amount of absorbed hydrogen increased again as a result of merely polishing the surface. This indicates that corrosion products formed on immersing specimens in a solution of ammonium thiocyanate strongly affect hydrogen absorption behavior. Whereas, variation of the solution, such as increase in pH, during immersion also affects slightly hydrogen absorption behavior.

収録刊行物

  • 材料と環境 : zairyo-to-kankyo

    材料と環境 : zairyo-to-kankyo 61(6), 249-256, 2012-06-15

    公益社団法人 腐食防食学会

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各種コード

  • NII論文ID(NAID)
    10030764797
  • NII書誌ID(NCID)
    AN10235427
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    09170480
  • NDL 記事登録ID
    023836792
  • NDL 請求記号
    Z17-266
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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