<strong>2304</strong>双相不锈钢钢筋在混凝土孔隙模拟液中的电化学腐蚀行为研究

doi:10.11902/1005.4537.2022.417

中国腐蚀与防护学报

2024, Vol. 44

Issue (1): 204-212 CSTR: 32134.14.1005.4537.2022.417 DOI: 10.11902/1005.4537.2022.417

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2304双相不锈钢钢筋在混凝土孔隙模拟液中的电化学腐蚀行为研究

刘国强¹(

), 张东方¹^,², 陈昊翔¹, 范志宏¹^,², 熊建波¹^,², 吴清发³

^1.中交四航工程研究院有限公司水工构造物耐久性技术交通运输行业重点实验室广州 510230
^2.南方海洋科学与工程广东省实验室(珠海) 珠海 519080
^3.港珠澳大桥管理局珠海 519080

Electrochemical Corrosion Behavior of 2304 Duplex Stainless Steel in a Simulated Pore Solution in Reinforced Concrete Serving in Marine Environment

LIU Guoqiang¹(

), ZHANG Dongfang¹^,², CHEN Haoxiang¹, FAN Zhihong¹^,², XIONG Jianbo¹^,², WU Qingfa³

^1.Key Laboratory of Harbor & Marine Structure Durability Technology, Ministry of Transport, CCCC Fourth Harbor Engineering Institute Co., Ltd., Guangzhou 510230, China
^2.Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519080, China
^3.Hong Kong -Zhuhai -Macao Bridge Authority, Zhuhai 519080, China

引用本文:

刘国强, 张东方, 陈昊翔, 范志宏, 熊建波, 吴清发. 2304双相不锈钢钢筋在混凝土孔隙模拟液中的电化学腐蚀行为研究[J]. 中国腐蚀与防护学报, 2024, 44(1): 204-212.
Guoqiang LIU, Dongfang ZHANG, Haoxiang CHEN, Zhihong FAN, Jianbo XIONG, Qingfa WU. Electrochemical Corrosion Behavior of 2304 Duplex Stainless Steel in a Simulated Pore Solution in Reinforced Concrete Serving in Marine Environment[J]. Journal of Chinese Society for Corrosion and protection, 2024, 44(1): 204-212.

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摘要:

采用开路电位测试、电化学阻抗谱测试、动电位极化曲线测试及Mott-Schottky曲线测试研究了HRB400普通碳素钢筋、304奥氏体不锈钢钢筋与2304奥氏体-铁素体型双相不锈钢钢筋在海洋环境中的钝化行为、耐氯盐侵蚀性能及耐蚀机理。结果表明，在混凝土孔隙模拟液中，3种钢筋在混凝土孔隙模拟液中的腐蚀电位不断提升，阻抗模值、相位角峰宽均逐渐增大，最大相位角向低频方向移动。Mott-Schottky测试结果显示，HRB400钢筋钝化膜中点缺陷密度较高，2304双相不锈钢钢筋钝化膜的点缺陷密度最小。在含氯混凝土孔隙模拟液中，HRB400钢筋、304不锈钢钢筋和2304双相不锈钢钢筋的临界Cl^-浓度范围分别为0.02~0.03、1.5~2.0和3.5~4.0 mol/L，其中2304双相不锈钢钢筋较强的耐氯盐侵蚀性能主要是因为钢筋表面钝化膜较低的点缺陷密度和致密的结构，以及Cr、Ni、Mo等耐蚀元素形成的钝化膜对Cl^-较强的排斥作用。

关键词 ：不锈钢钢筋, 海洋环境, 钝化行为, 耐氯盐侵蚀性能

Abstract：

The corrosion behavior of rebar steels such as HRB400 plain carbon steel, 304 austenitic stainless steel and 2304 austenitic-ferritic duplex stainless steel in an artificial solution, which aims to simulate the fluids in pores of reinforced concrete serving in marine environments, was comparatively investigated by means of measurements of open-circuit potential, electrochemical impedance spectrum, dynamic potential polarization curve and Mott-Schottky curve etc. The results showed that the corrosion potential of the three rebar steels in the simulated solution increased continuously, the impedance modulus and phase angle peak width increased gradually, and the maximum phase angle shifted to the low frequency direction. Mott-Schottky curve measurement results showed that the point defect density in the passivation film of HRB400 plain steel was high, and that in the passivation film of 2304 duplex stainless steel was minimal. The critical chloride ion concentrations for HRB400 plain steel, 304 stainless steel and 2304 duplex stainless steel are in the range of 0.02-0.03, 1.5-2.0 and 3.5-4.0 mol/L, respectively. While the excellent resistance to chloride-induced corrosion of 2304 duplex stainless steel was mainly due to the lower point defect density and compact structure, as well as the enrichment in Cr, Ni, Mo and other corrosion-resistant elements of the passivation film on the steel surface, which enable the passive film stronger repulsive effect on the Cl^- ions.

Key words： stainless steel rebar marine environment passivation behavior chloride-induced corrosion resistance

收稿日期: 2023-01-06 32134.14.1005.4537.2022.417

ZTFLH:

TG172.5

基金资助:国家重点研发计划(2019YFB1600700)

通讯作者: 刘国强,男，1997年生，硕士，助理工程师，E-mail：liuguoqiang020@163.com，研究方向为材料腐蚀与防护、海洋钢筋混凝土结构耐久性

Corresponding author: LIU Guoqiang, E-mail: liuguoqiang020@163.com

作者简介: 刘国强，男，1997年生，硕士，助理工程师

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https://www.jcscp.org/CN/10.11902/1005.4537.2022.417 或 https://www.jcscp.org/CN/Y2024/V44/I1/204

表1 3种实验用钢筋的主要化学成分 (mass fraction / %)

图1 3种钢筋在混凝土孔隙模拟液中的OCP随时间变化图

图2 3种钢筋在混凝土孔隙模拟液不同浸泡时间下的EIS

图3 拟合所采用的等效电路图

图4 3种钢筋EIS拟合结果

图5 3种钢筋在混凝土孔隙模拟中钝化10 d后的Mott-Schottky曲线图

表2 3种钢筋生成钝化膜的载流子密度和平带电位

图6 3种钢筋在混凝土孔隙模拟液中浸泡1和240 h后的动电位极化曲线及腐蚀电流密度

图7 3种钢筋在不同含氯混凝土孔隙模拟液中的OCP随NaCl浓度变化

图8 3种钢筋在不同含氯混凝土孔隙模拟液中的EIS

图9 3种钢筋在不同含氯混凝土孔隙模拟液中的EIS拟合结果随NaCl浓度变化

图10 3种钢筋在含4.5 mol/L NaCl混凝土孔隙模拟液中的Mott-Schottky曲线图

表3 3种钢筋在含4.5 mol/L NaCl的混凝土孔隙模拟液中表面钝化膜的载流子密度

图11 3种钢筋在不同含氯混凝土孔隙模拟液中的动电位极化曲线图及腐蚀电流密度

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