外加电位对X90钢及其焊缝在近中性土壤模拟溶液中应力腐蚀行为的影响
发布时间：2018-07-28 14:26
【摘要】：采用慢应变速率拉伸(SSRT)实验、动电位极化技术和SEM观察等方法,研究了X90钢基体和焊缝在近中性土壤模拟溶液中不同阴极保护电位下的应力腐蚀行为。结果表明,X90管线钢及其焊缝组织在近中性土壤模拟溶液中均具有一定的应力腐蚀敏感性,裂纹扩展为穿晶腐蚀裂纹;应力腐蚀开裂(SCC)的裂纹萌生与扩展与外加保护电位有关。在开路电位(OCP)~-1000 m V的电位范围内,X90钢的SCC机制均为阳极溶解(AD)+氢脆(HE)的混合机制;在OCP下,由于AD作用较强,SCC敏感性较明显;在-800 m V下,由于AD和HE作用均较弱,导致SCC敏感性最低;而在-900 m V时,由于HE作用明显增强,具有最高的SCC敏感性;在相同电位条件下,焊缝的SCC敏感性高于母材。
[Abstract]:The stress-corrosion behavior of X90 steel under different cathodic protection potentials in simulated solution of near-neutral soil was studied by means of slow strain rate tensile (SSRT) test, potentiodynamic polarization technique and SEM observation. The results show that the microstructure of X90 pipeline steel and its weld seam are sensitive to stress corrosion in near-neutral soil simulated solution and the crack propagation is transgranular corrosion crack. The crack initiation and propagation of stress corrosion cracking (SCC) is related to the applied protection potential. The SCC mechanism of X90 steel is the mixed mechanism of anodic dissolution of (AD) hydrogen embrittlement (HE) in the open circuit potential range of 1 000 MV, under OCP, the sensitivity of (AD) is obvious because of the strong effect of AD, and the effect of AD and HE is weak at -800 MV. The sensitivity of SCC is the lowest, but at -900mV, the sensitivity of SCC is the highest due to the obvious enhancement of HE, and the sensitivity of SCC in weld is higher than that of base metal under the same potential.
【作者单位】： 北京科技大学腐蚀与防护中心;北京科技大学腐蚀与防护教育部重点实验室;中国科学院宁波材料技术与工程研究所;
【基金】：国家重点基础研究发展计划项目No.2014CB643300 国家自然科学基金项目Nos.51471034和51131001 中央高校基本科研业务费专项项目No.FRF-TP-15-047A3~~
【分类号】：TG172.9
本文编号：2150516
[Abstract]:The stress-corrosion behavior of X90 steel under different cathodic protection potentials in simulated solution of near-neutral soil was studied by means of slow strain rate tensile (SSRT) test, potentiodynamic polarization technique and SEM observation. The results show that the microstructure of X90 pipeline steel and its weld seam are sensitive to stress corrosion in near-neutral soil simulated solution and the crack propagation is transgranular corrosion crack. The crack initiation and propagation of stress corrosion cracking (SCC) is related to the applied protection potential. The SCC mechanism of X90 steel is the mixed mechanism of anodic dissolution of (AD) hydrogen embrittlement (HE) in the open circuit potential range of 1 000 MV, under OCP, the sensitivity of (AD) is obvious because of the strong effect of AD, and the effect of AD and HE is weak at -800 MV. The sensitivity of SCC is the lowest, but at -900mV, the sensitivity of SCC is the highest due to the obvious enhancement of HE, and the sensitivity of SCC in weld is higher than that of base metal under the same potential.
【作者单位】： 北京科技大学腐蚀与防护中心;北京科技大学腐蚀与防护教育部重点实验室;中国科学院宁波材料技术与工程研究所;
【基金】：国家重点基础研究发展计划项目No.2014CB643300 国家自然科学基金项目Nos.51471034和51131001 中央高校基本科研业务费专项项目No.FRF-TP-15-047A3~~
【分类号】：TG172.9
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