NaClを含む飽和Ca(OH)2水溶液中におけるウラシル誘導体の鉄鋼腐食抑制効果 The Inhibitory Effects of Uracil Derivatives on Corrosion of Steel in Saturated Ca(OH)_2 Solutions Containing NaCl

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Abstract

<p>The inhibitory effects of uracil and its derivatives on the corrosion of a steel used for reinforcement of concrete were investigated by polarization measurements in a saturated Ca(OH)<sub>2</sub> solution containing 0.53 mol/dm<sup>3</sup> NaCl at pH 12.5, which is a simulated concrete-pore solution, during short-term (7-day) experiments. The inhibition mechanisms were also investigated by surface analyses (FT-IR and XPS). Uracil, 5-nitrouracil, and 5-aminouracil inhibited the corrosion of steel. 5-Aminouracil was the most effective; its inhibition efficiency was more than 98% at concentrations higher than 5.0 × 10<sup>−2</sup> mol/dm<sup>3</sup> in the solution. 5-Aminouracil was adsorbed onto steel surfaces in accordance with the Langmuir adsorption isotherm. In a NaOH solution containing 0.53 mol/dm<sup>3</sup> NaCl at the same pH (12.5), 5-aminouracil did not exhibit any inhibitory effects, which suggests that calcium cations in the solution are indispensable for the inhibitory effect. The FT-IR spectra implied that 5-aminouracil was adsorbed onto iron oxides on the steel surfaces through the formation of a coordination bond with the amino group at position 5 and a coordination or a covalent bond with the carbon at position 6 of the pyrimidine ring. The XPS analysis showed that 5-aminouracil was adsorbed onto the steel surfaces along with calcium.</p>

Journal

  • Electrochemistry

    Electrochemistry 70(5), 322-328, 2002-05-05

    The Electrochemical Society of Japan

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Codes

  • NII Article ID (NAID)
    10008223538
  • NII NACSIS-CAT ID (NCID)
    AN00151637
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    13443542
  • NDL Article ID
    6128452
  • NDL Source Classification
    ZP1(科学技術--化学・化学工業)
  • NDL Call No.
    Z17-14
  • Data Source
    CJP  NDL  J-STAGE 
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