静水压力对吉帕级海工钢母材及焊材腐蚀行为的影响  

Influence of Hydrostatic Pressure on Corrosion Behavior of Base Metaland Welded Joint of GPa-grade Offshore Engineering Steel in 3.5%NaCl Solution

作　　者：王亚东 马荣耀 万晔[1] 董俊华[2] WANG Yadong;MA Rongyao;WAN Ye;DONG Junhua(School of Materials Science and Engineering,Shenyang Jianzhu University,Shenyang 110168,China;Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[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

出　　处：《中国腐蚀与防护学报》2025年第3期653-663,共11页Journal of Chinese Society For Corrosion and Protection

基　　金：辽宁省科技重大专项(2020JH1/10100001);国家自然科学基金(52201094)。

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。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.

关 键 词：静水压力 吉帕级海工钢 母材 焊缝 电化学噪声 

分 类 号：TG172[金属学及工艺—金属表面处理]