<strong>Cu</strong>含量对<strong>Q420</strong>钢在货油舱内底板环境下腐蚀行为的影响

doi:10.11902/1005.4537.2023.308

中国腐蚀与防护学报

2024, Vol. 44

Issue (4): 927-938 CSTR: 32134.14.1005.4537.2023.308 DOI: 10.11902/1005.4537.2023.308

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Cu含量对Q420钢在货油舱内底板环境下腐蚀行为的影响

刘超¹, 代文贺¹, 王克俊², 陈增耀², 安雁军¹, 刘智勇¹^,²(

)

1.河北省特种设备监督检验研究院国家市场监管重点实验室(钢制管子及管件安全评) 石家庄 050061
2.北京科技大学新材料技术研究院北京 100083

Effect of Cu Content on Corrosion Behavior of Q420 Steel in an Artificial Solution of Bottom Plate Environment of Cargo Oil Tanks

LIU Chao¹, DAI Wenhe¹, WANG Kejun², CHEN Zengyao², AN Yanjun¹, LIU Zhiyong¹^,²(

)

1. Key Laboratory of Safety Evaluation of Steel Pipes and Fittings for State Market Regulation, Hebei Special Equipment Supervision and Inspection Institute, Shijiazhuang 050061, China
2. Institute of Advanced Materials & Technology, University of Science and Technology Beijing, Beijing 100083, China

引用本文:

刘超, 代文贺, 王克俊, 陈增耀, 安雁军, 刘智勇. Cu含量对Q420钢在货油舱内底板环境下腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2024, 44(4): 927-938.
Chao LIU, Wenhe DAI, Kejun WANG, Zengyao CHEN, Yanjun AN, Zhiyong LIU. Effect of Cu Content on Corrosion Behavior of Q420 Steel in an Artificial Solution of Bottom Plate Environment of Cargo Oil Tanks[J]. Journal of Chinese Society for Corrosion and protection, 2024, 44(4): 927-938.

全文: PDF(24740 KB) HTML

摘要:

对Q420钢进行适当的Cu合金化功能性改进，制备出不同Cu含量(质量分数分别为0.5%、1.0%、1.5%和2.0%)的新型低合金实验钢。利用浸泡实验、扫描电子显微镜(SEM)、X射线衍射仪(XRD)、透射电子显微镜(TEM)等方法对含Cu低合金钢在货油舱内底板点蚀坑内环境(pH 0.85的10%(质量分数)NaCl溶液)中的腐蚀规律与机理进行了研究。结果表明，以铁素体+珠光体为组织特征的1.0Cu低合金钢能够保证在Q420钢强度的水平下具有优异的耐腐蚀性能。随着浸泡时间的延长，5种不同Cu含量钢的腐蚀速率整体呈下降趋势。Cu含量为1%时，腐蚀速率降到0.29 mm/a，与Q420基准钢相比降低了43%。实验证明Cu的添加对Q420钢在货油舱内底板环境下的均匀腐蚀性具有积极的作用。

关键词 ： Cu, 货油轮, 腐蚀, 低合金钢

Abstract：

Trial low alloy steels based on Q420 steel were prepared by alloying with a little amount of Cu 0.5%, 1.0%, 1.5% and 2.0%, mass fraction. Then their corrosion behavior was assessed in an artificial solution (i.e. 10%NaCl (mass fraction) solution with pH 0.85) as a simulation of the corrosive environment of the bottom plate of cargo oil tanks were studied by means of immersion tests, SEM, XRD, TEM, and other methods. The results indicate that the low alloy steel with 1.0%Cu of a microstructure of ferrite and pearlite can ensure excellent corrosion resistance at the strength level of Q420 steel. The addition of Cu plays a crucial role in the corrosion resistance of the low alloy steel. As the soaking time prolongs, the corrosion rate of the trial steels with 5 different Cu-content shows an overall downward trend. The trial low alloy steel with 1%Cu presents a corrosion rate of 0.29 mm/a, which is 43% lower than the Q420 benchmark steel. The study proves that the addition of Cu has a positive effect on the uniform corrosion of Q420 in the simulated bottom plate environment of cargo oil tanks.

Key words： Cu cargo tanker corrosion low alloy steel

收稿日期: 2023-09-26 32134.14.1005.4537.2023.308

ZTFLH:

TG174.2

基金资助:国家自然科学基金(52071017)

通讯作者: 刘智勇，E-mail：liuzhiyong7804@126.com，研究方向为材料腐蚀失效机理与防护技术

Corresponding author: LIU Zhiyong，E-mail: liuzhiyong7804@126.com

作者简介: 刘超，男，1987年生，硕士，高级工程师

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Sample	C	Si	Mn	P	Al	S	Cu	Ni	Cr	Nb	Ti	Ca
0Cu	0.11	0.47	1.42	0.0095	0.031	0.027	-	0.23	0.45	0.063	0.015	$≤ 0.05$
0.5Cu	0.11	0.36	1.32	0.0093	0.031	0.022	0.52	0.22	0.39	0.028	0.015	$≤ 0.05$
1Cu	0.10	0.30	1.49	0.0085	0.032	$0.025$	1.03	0.2	0.36	0.028	$≤ 0.01$	$≤ 0.05$
1.5Cu	0.096	0.22	1.52	0.0090	0.035	0.026	1.68	0.22	0.38	0.028	0.014	$≤ 0.05$
2Cu	0.096	0.23	1.43	0.0086	0.036	0.026	2.04	0.21	0.36	0.024	0.012	$≤ 0.05$

表1 不同成分实验钢的化学成分 (mass fraction / %)

图1 不同成分实验钢的金相组织

图2 不同成分实验钢的EBSD中IPF图和平均晶粒尺寸图

图3 1Cu钢的透射电镜图和析出相能谱

图4 5种实验钢的硬度、抗拉强度和屈服强度以及不同温度下的冲击功

图5 5种实验钢在模拟液中浸泡不同时间的腐蚀速率

图6 5种实验钢在模拟液中浸泡3和30 d后的宏观形貌

图7 5种实验钢在模拟液中浸泡30 d且除锈后表面微观形貌图及EDS分析结果

图8 浸泡30 d后5种实验钢锈层截面中的元素面分布

图9 实验钢浸泡30 d后腐蚀产物的XRD谱与α*/γ值

图10 1Cu钢浸泡30 d后锈层的XPS图谱

图11 5种实验钢在模拟液中的极化曲线

表2 5种实验钢极化曲线的拟合结果

图12 5种实验钢浸泡不同时间后的EIS

图13 EIS拟合的等效电路及Rct + Rf拟合值

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