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中国腐蚀与防护学报  2025, Vol. 45 Issue (3): 653-663     CSTR: 32134.14.1005.4537.2024.171      DOI: 10.11902/1005.4537.2024.171
  研究报告 本期目录 | 过刊浏览 |
静水压力对吉帕级海工钢母材及焊材腐蚀行为的影响
王亚东1, 马荣耀2(), 万晔1(), 董俊华2
1.沈阳建筑大学材料科学与工程学院 沈阳 110168
2.中国科学院金属研究所 沈阳 110016
Influence of Hydrostatic Pressure on Corrosion Behavior of Base Metaland Welded Joint of GPa-grade Offshore Engineering Steel in 3.5%NaCl Solution
WANG Yadong1, MA Rongyao2(), WAN Ye1(), DONG Junhua2
1.School of Materials Science and Engineering, Shenyang Jianzhu University, Shenyang 110168, China
2.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
引用本文:

王亚东, 马荣耀, 万晔, 董俊华. 静水压力对吉帕级海工钢母材及焊材腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2025, 45(3): 653-663.
Yadong WANG, Rongyao MA, Ye WAN, Junhua DONG. Influence of Hydrostatic Pressure on Corrosion Behavior of Base Metaland Welded Joint of GPa-grade Offshore Engineering Steel in 3.5%NaCl Solution[J]. Journal of Chinese Society for Corrosion and protection, 2025, 45(3): 653-663.

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摘要: 

本文采用线性极化电阻(LPR)、电化学阻抗谱(EIS)、动电位极化及电化学噪声方法(EN)研究了不同静水压力(0.1、6和12 MPa)对一种吉帕级海工钢母材及其焊缝金属在3.5%NaCl溶液中腐蚀行为的影响。结果表明：在不同静水压力条件下，吉帕级海工钢母材的耐蚀性优于焊缝金属；静水压力对吉帕级海工钢母材及焊缝金属的阴极过程影响较小，但可促进其阳极溶解过程，从而加速吉帕级海工钢母材及焊缝金属的腐蚀速率；提高静水压力使吉帕级海工钢母材及焊缝金属的局部腐蚀倾向增大。
关键词 ： 静水压力,  吉帕级海工钢,  母材,  焊缝,  电化学噪声    
Abstract：

The effect of different hydrostatic pressures (0.1, 6, and 12 MPa) on the corrosion behavior of the base metal and welded joint for a GPa-grade offshore engineering steel in a 3.5%NaCl solution was investigated by using linear polarization resistance (LPR), electrochemical impedance spectroscopy (EIS), potentiodynamic polarization, and electrochemical noise (EN) methods. The results indicate that in conditions of various hydrostatic pressures, the corrosion resistance of the base metal of the GPa-grade offshore engineering steel is better than that of the welded joint. Hydrostatic pressure has a minor impact on the cathodic process of both the matrix and the welded joint, but it can promote their anodic dissolution process, thereby accelerating the corrosion rate of both. With the increasing hydrostatic pressure, the local corrosion susceptibility of both the base metal and welded joint of GPa-grade offshore engineering steel was enhanced.
Key words： hydrostatic pressure    GPa-grade offshore engineering steel    base material    welded joint    electrochemical noise
收稿日期: 2024-05-31      32134.14.1005.4537.2024.171
ZTFLH:  TG172  
基金资助:辽宁省科技重大专项(2020JH1/10100001);国家自然科学基金(52201094)
通讯作者: 马荣耀，E-mail：ryma14b@imr.ac.cn，研究方向为金属腐蚀与防护; 万 晔，E-mail：ywan@sjzu.edu.cn，研究方向为先进材料的制备与性能研究、材料腐蚀与防护
Corresponding author: MA Rongyao, E-mail: ryma14b@imr.ac.cn; WAN Ye, E-mail: ywan@sjzu.edu.cn
作者简介: 王亚东，男，1998年生，硕士生
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链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2024.171      或      https://www.jcscp.org/CN/Y2025/V45/I3/653

图1  吉帕级海工钢母材及焊缝的金相组织SEM照片
图2  吉帕级海工钢母材及焊缝在0.1和12 MPa 3.5%NaCl溶液中腐蚀后表面形貌
图3  吉帕级海工钢母材及焊缝在不同静水压力下的极化曲线
MaterialsPressure / MPaEcorr / VIcorr / μA·cm-2
Matrix0.1-0.5333.154
6-0.5893.851
12-0.5925.503
Welded0.1-0.5863.275
6-0.5945.978
12-0.6126.575
表1  根据极化曲线拟合所得Ecorr及Icorr参数
图4  吉帕级海工钢母材及焊缝在不同静水压力下的RLPR
图5  吉帕级海工钢母材及焊缝在不同静水压力下的EIS图
图6  用于拟合EIS的等效电路
MaterialPressureRsQo, YQo, nRoWoQa, YQa, nRa
MPaΩ·cm2mS·s n ·cm2-Ω·cm2mS·s0.5·cm2mS·s n ·cm2-Ω·cm2
Matrix0.16.441.35 × 10-30.87525693.95 × 10-24.29 × 10-40.59717.24
66.791.45 × 10-30.92023901.74 × 10-23.34 × 10-20.60513.31
126.891.19 × 10-30.86421461.65 × 10-34.55 × 10-30.58412.84
Welded0.16.689.18 × 10-40.90224361.24 × 10-22.60 × 10-30.63314.59
66.561.90 × 10-30.75822371.88 × 10-25.01 × 10-30.6325.525
127.587.46 × 10-51.00019918.45 × 10-38.55 × 10-40.8560.687
表2  根据电化学阻抗拟合所得参数
图7  母材及焊缝金属分别在0.1和12 MPa下电化学电位噪声去直流漂移后的噪声图谱
图8  母材及焊缝金属分别在0.1和12 MPa下电化学电流噪声去直流漂移后的噪声图谱
图9  吉帕级海工钢在静水压力分别为0.1和12 MPa的3.5%NaCl中的q vs fn 图
图10  吉帕级海工钢母材及焊缝金属在静水压力分别为0.1和12 MPa的3.5%NaCl中典型EPN的Hilbert谱
图11  吉帕级海工钢母材及焊缝金属在静水压力分别为0.1和12 MPa的3.5%NaCl中Hilbert边际谱
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