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Study on the corrosion behavior of steel Q315NS heat-affected zone in a HCl solution using electrochemical noise

机译：电化学噪声研究HCl溶液中钢Q315NS热影响区的腐蚀行为

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摘要

The microstructure and corrosion behavior of a base metal (BM) and heat-affected zone (HAZ) of Q315NS steel in 0.1 mol L-1 HCl solution at 60 degrees C were investigated with a thermal simulation technique, surface observation and electrochemical measurements. The transient characteristics, as well as the power spectral density (PSD) and wavelet transform, had been employed to analyze the electrochemical noise (EN) data. It was revealed that the microstructure of BM, the fine grained region (FGHAZ) and the inter critical region (ICHAZ) mainly consisted of ferrite and pearlite, while the coarse grained region (CGHAZ) mainly consisted of granular bainite. The corrosion processes of BM, FGHAZ and ICHAZ were similar and characterized by two stages. The first stage involved the metastable pitting process and the second stage corresponded to the pitting corrosion. On the CGHAZ electrode, metastable pitting occurred in the initial corrosion stage and then the corrosion process turned into uniform corrosion. With increasing corrosion time, the corrosion strength of all electrodes decreased significantly at first and then remained constant. The corrosion rate of CGHAZ was slightly lower than the other electrodes in the second corrosion stage, and there was no obvious difference in corrosion rate among BM, FGHAZ and ICHAZ.
机译：采用热仿真技术，表面观察和电化学测量，研究了Q315NS钢中Q315NS钢中Q315NS钢中的Q315NS钢中的基础金属（BM）和热影响区（HAZ）的微观结构和腐蚀行为。已经采用了瞬态特性，以及功率谱密度（PSD）和小波变换来分析电化学噪声（EN）数据。据透露，BM，细粒度区域（FGGHAZ）和临界区（ICHAZ）的微观结构主要由铁氧体和珠光体组成，而粗粒区域（CGHAZ）主要由粒状贝氏体组成。 BM，FGHAZ和ICHAZ的腐蚀过程类似，其特点是两个阶段。第一阶段涉及亚稳地蚀处理，第二阶段对应于蚀腐蚀。在CGHAZ电极上，在初始腐蚀阶段发生亚稳定性点，然后腐蚀过程变成均匀的腐蚀。随着腐蚀时间的增加，所有电极的腐蚀强度首先显着降低，然后保持恒定。 CGHAZ的腐蚀速率略低于第二腐蚀阶段中的其他电极，BM，FGHAZ和ICHAZ之间的腐蚀速率没有明显差异。

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  • 来源
    《RSC Advances》 |2018年第1期|共10页
  • 作者

    Zhang S. Q.; Zhao H. Y.; Shu F. Y.; Wang G. D.; Liu B.; Xu B. S.;

  • 作者单位

    Harbin Inst Technol Shandong Prov Key Lab Special Welding Technol Harbin 150001 Heilongjiang Peoples R China;

    Harbin Inst Technol Shandong Prov Key Lab Special Welding Technol Harbin 150001 Heilongjiang Peoples R China;

    Harbin Inst Technol Shandong Prov Key Lab Special Welding Technol Harbin 150001 Heilongjiang Peoples R China;

    Harbin Inst Technol Shandong Prov Key Lab Special Welding Technol Harbin 150001 Heilongjiang Peoples R China;

    Jiangsu Univ Sci &

    Technol Sch Mat Sci &

    Engn Zhenjiang 212003 Peoples R China;

    Acad Armoured Forces Engn Natl Key Lab Remfg Beijing 100072 Peoples R China;

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  • 正文语种 eng
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