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Mechanistic interpretation on acidic stress-corrosion cracking of NiCrMoV steam turbine steel

机译：尼古尔马夫汽轮机钢酸性胁迫腐蚀开裂的机械解释

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摘要

The present work evaluates the acidic stress-corrosion cracking (SCC) of NiCrMoV steam turbine steel. Between a pH of 4.2 and 7, iron oxidises to Fe_2O_3, whereas iron dissolution (Fe~(2-)) and hydrogen proton (H~-) reduction are favoured at lower pH. The corrosion rate increases with the H~- concentration via a linear relationship as well as by a temperature increase. During in-situ constant extension rate testing, both the ductility and strength losses, caused by anodic dissolution and hydrogen embrittlement, increase with a higher acetic acid concentration. Hydrogen embrittlement causes larger embrittled zones with higher acetic acid concentrations as well as stress-corrosion cracking.
机译：目前的作品评估了Nicrmov汽轮机钢的酸性应力腐蚀裂纹（SCC）。在4.2和7的pH之间，铁氧化至Fe_2O_3，而铁溶解（Fe〜（2-））和氢质子（H〜 - ）减少在较低的pH下有利。通过线性关系以及温度升高，腐蚀速率随着H〜 - 浓度的增加。在原位恒定延长速率测试期间，由阳极溶解和氢气脆化引起的延展性和强度损失，随着较高的乙酸浓度而增加。氢脆使具有更高乙酸浓度的脆性区域以及应力 - 腐蚀裂缝。

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  • 来源
    《Materials Science and Engineering》 |2021年第20期|140433.1-140433.13|共13页
  • 作者

    T. De Seranno; E. Lambrechts; A.R.D. Verliefde; T. Depover; K. Verbeken;

  • 作者单位

    Ghent University Department of Materials Textiles and Chemical Engineering Technologiepark 46 9052 Zwijnaarde Belgium;

    Ghent University Department of Materials Textiles and Chemical Engineering Technologiepark 46 9052 Zwijnaarde Belgium;

    Ghent University Department of Green Chemistry and Technology Coupure Links 653 9000 Ghent Belgium;

    Ghent University Department of Materials Textiles and Chemical Engineering Technologiepark 46 9052 Zwijnaarde Belgium;

    Ghent University Department of Materials Textiles and Chemical Engineering Technologiepark 46 9052 Zwijnaarde Belgium;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    A. electron microscopy; A. stress/strain measurements; B. iron alloys; D. plasticity;

    机译：A.电子显微镜;A.压力/应变测量;B.铁合金;D.可塑性;

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