Nb对X80钢焊接热影响区在模拟海水中腐蚀行为的影响

doi:10.11902/1005.4537.2016.177

中国腐蚀与防护学报

2016, Vol. 36

Issue (6): 604-610 DOI: 10.11902/1005.4537.2016.177

本期目录 | 过刊浏览

Nb对X80钢焊接热影响区在模拟海水中腐蚀行为的影响

王子豪,黄运华(

),李佳,杨浪,谢冬寒

北京科技大学腐蚀防护中心北京 100083

Effect of Nb on Corrosion Behavior of Simulated Weld HAZs of X80 Pipeline Steel in Simulated Seawater Environments Correxxxxsponding to Shallow Sea and Deep Sea

Zihao WANG,Yunhua HUANG(

),Jia LI,Lang YANG,Donghan XIE

Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China

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摘要:

通过对两种Nb含量的X80钢进行热处理来模拟出包含 (ICHAZ)、细晶区 (FGHAZ) 和粗晶区 (CGHAZ) 的热影响区组织。通过金相显微镜观察热模拟组织的形貌,通过透射电镜 (TEM) 来观察热影响区析出相的分布状况。两种Nb含量的X80钢与所模拟出来的组织相互比较,分析它们在浅海与深海的电化学行为以及在浅海中的短期腐蚀行为,从而明确Nb对X80钢及其模拟组织在浅海与深海中腐蚀行为影响。结果表明,焊接热影响区中粗晶区及两相热影响区的腐蚀速率最大,并且Nb能够提高X80钢的均匀性及腐蚀产物膜的致密性,从而提高其耐蚀性。此外,在深海中NbC纳米析出相能够充当氢陷阱,捕集一定量的氢,从而提高其在深海中的耐蚀性。

关键词 ：热影响区, 浅海, 深海, Nb, 腐蚀行为

Abstract：

The simulated intercritical HAZ (ICHAZ), fine grained HAZ (FGHAZ) and coarse grained HAZ (CGHAZ) of weld joints for two Nb containing steels were prepared by means of heat treatment. Then their microstructure and distribution of nano-sized precipitates were characterized by means of optical microscopy and transmission electron microscopy. Their corrosion behavior in simulated seawater environments corresponding to shallow sea and deep sea of 600 m below sea level respectively were studied by conventional electrochemical techiques and immersion tests. It's shown that the corrosion rate of ICHAZ and CGHAZ is much higher than that of FGHAZ. What's more, with the addition of Nb, the microstructural homogeneity of the steel is improved and the corrosion products films formed on the steels become much compact, thus enhancing their corrosion resistance. Besides, the nano-sized NbC precipitates can act as traps for capturing hydrogen, thus enhancing their corrosion resistance also in the seawater of deep sea.

Key words： HAZ shallow seawater deep seawater Nb corrosion behavior

基金资助:国家重点研发计划项目 (2016YFB0300604),国家重点基础研究发展计划项目 (2014CB643300),国家自然科学基金项目(51471033) 和国家材料环境腐蚀平台资助

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引用本文:

王子豪,黄运华,李佳,杨浪,谢冬寒. Nb对X80钢焊接热影响区在模拟海水中腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2016, 36(6): 604-610.
Zihao WANG, Yunhua HUANG, Jia LI, Lang YANG, Donghan XIE. Effect of Nb on Corrosion Behavior of Simulated Weld HAZs of X80 Pipeline Steel in Simulated Seawater Environments Correxxxxsponding to Shallow Sea and Deep Sea. Journal of Chinese Society for Corrosion and protection, 2016, 36(6): 604-610.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2016.177 或 https://www.jcscp.org/CN/Y2016/V36/I6/604

表1 两种实验用X80钢的化学成分

图1 不同Nb含量X80钢及其模拟热影响区组织金相图

图2 含Nb和不含Nb的X80钢的TEM明场像

图3 X80钢及其热模拟组织硬度值

图4 X80钢及其模拟组织在浅海环境中的极化曲线

图5 X80钢及其模拟组织在深海环境中的极化曲线

图6 X80钢及其模拟组织在浅海以及深海环境下的腐蚀电流密度

图7 X80钢及其模拟组织浸泡50 d后的腐蚀形貌 (带锈)

图8 X80钢及其模拟组织浸泡50 d后的腐蚀形貌 (除锈后)

图9 X80钢及其模拟组织浸泡50 d的腐蚀速率

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