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首页> 外文期刊>ISIJ international >Electroless Nickel Coating Kinetics on TMT Rebar Surface and Coating Characterisation
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Electroless Nickel Coating Kinetics on TMT Rebar Surface and Coating Characterisation

机译：TMT钢筋表面的化学镀镍动力学及镀层表征

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摘要

The corrosion resistance Ni-P-Fe alloy coating was obtained on rebar surface by an electroless process using glycolic acid as a complexing agent. During dipping of the iron scale free rebar in electroless solution, Fe first dissolves and the surface is activated. Subsequently, Ni, P and Fe are co-deposited by an autocat-alytic process. The coating was characterised using SEM, EDS and XRD techniques. The weight percentage of Ni, P and Fe in the coating showed a relationship with the coating time. The Tafel and salt spray tests were conducted to find out corrosion resistance performance of coated samples. Electrochemical behavior of the coated rebar in simulated concrete environment is influenced by the pH of the concrete pore solution and the P content in the coating. Corrosion potential and the corrosion rate of the coatings increased with the increase in P content in the coating and pH of the pore solution whereas the resistance against chloride attack increased with increase in P content in the coating. Coated rebars showed reduction in bond strength in the range of 8 to 14% compared to the bare rebars. The maximum (～14%) drop in bond strength was observed for longer coating time. This can be attributed to the smoother coating surface. The coating obtained under longer coating time showed higher amount of P which contributed to maximum surface smoothness. However, this bond strength was much above the necessary strength requirement according to Indian standard specification.
机译：使用乙醇酸作为络合剂，通过化学方法在钢筋表面获得了耐腐蚀的Ni-P-Fe合金涂层。在将无铁鳞的钢筋浸入化学溶液的过程中，Fe首先溶解并且表面被活化。随后，通过自动催化过程共沉积Ni，P和Fe。使用SEM，EDS和XRD技术对涂层进行表征。镀层中Ni，P和Fe的重量百分比与镀层时间有关。进行了Tafel和盐雾测试，以发现涂层样品的耐腐蚀性。涂层钢筋在模拟混凝土环境中的电化学行为受混凝土孔隙溶液的pH值和涂层中P含量的影响。涂层的腐蚀电位和腐蚀速率随涂层中P含量的增加和孔隙溶液的pH值的增加而增加，而抗氯离子侵蚀性随涂层中P含量的增加而增加。与裸钢筋相比，带涂层的钢筋粘结强度降低了8％到14％。对于更长的涂覆时间，观察到粘结强度最大（〜14％）下降。这可以归因于较光滑的涂层表面。在更长的涂覆时间下获得的涂层显示出较高的P含量，这有助于最大程度的表面光滑度。但是，该粘合强度远高于根据印度标准规范的必要强度要求。

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  • 来源
    《ISIJ international》 |2010年第4期|p.556-560|共5页
  • 作者

    Manindra MANNA; Nikhilesh BANDYOPADHYAY;

  • 作者单位

    Research & Development Department, Tata Steel, Jamshedpur 831001 India;

    Research & Development Department, Tata Steel, Jamshedpur 831001 India;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    steel reinforced concrete; alkaline corrosion;

    机译：钢筋混凝土碱腐蚀;

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