深冷处理对EH40极寒环境船用钢板的海水腐蚀性能影响

doi:10.11902/1005.4537.2019.010

中国腐蚀与防护学报

2020, Vol. 40

Issue (2): 151-158 DOI: 10.11902/1005.4537.2019.010

研究报告

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深冷处理对EH40极寒环境船用钢板的海水腐蚀性能影响

沈树阳¹, 王东胜¹, 孙士斌², 杨剔², 赵前进², 王鑫², 张亚飞², 常雪婷¹(

)

1 上海海事大学海洋科学与工程学院上海 201306
2 上海海事大学物流工程学院上海 201306

Corrosion Behavior in Artificial Seawater of Subzero Treated EH40 Marine Steel Suitable for ExtremelyCold Environments

SHEN Shuyang¹, WANG Dongsheng¹, SUN Shibin², YANG Ti², ZHAO Qianjing², WANG Xin², ZHANG Yafei², CHANG Xueting¹(

)

1 College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China
2 College of Logistics Engineering, Shanghai Maritime University, Shanghai 201306, China

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摘要:

采用模拟浸泡实验技术，结合腐蚀形貌分析以及动电位极化和电化学阻抗技术研究了深冷处理对EH40极寒环境船用钢板在3.5% (质量分数) NaCl溶液中的海水腐蚀行为。结果表明：未经深冷处理的极寒环境船用钢板表面发生均匀腐蚀，在样品表面有均匀致密的腐蚀层产生；而经过-80 ℃深冷处理的钢板试样表面发生点蚀现象，其腐蚀失重增加，腐蚀速率由1.15 mm/a升至1.33 mm/a，增幅约为15.6%，同时腐蚀电流密度由1.244 μA·cm^-2升至3.643 μA·cm^-2，电化学阻抗值减小，耐蚀性降低；两者的腐蚀产物以α-FeOOH、β-FeOOH和γ-FeOOH为主。较低的环境温度对于极寒环境船用钢板的耐腐蚀性能有一定的影响。

关键词 ：极寒船用钢, 腐蚀性能, 深冷处理, 浸泡实验, 电化学测试

Abstract：

The corrosion behavior in artificial seawater of a marine steel plate suitable for extremely cold environments, EH40 steel before and after subzero treatment was studied by means of immersion test, electrochemical polarization curve measurement, electrochemical impedance spectroscopy, X-ray diffractometer and scanning electron microscope. Results showed that uniform corrosion occurred on the steel before subzero treatment, leading to the formation of a dense corrosion product scale on the steel surface. Whereas, pitting corrosion emerged on the steel subjected to subzero treatment at -80 ℃. The mass loss and corrosion current density of the steel before subzero treatment were 1.15 mm/a and 1.244 μA·cm^-2, respectively, which increased to 1.33 mm/a and 3.643 μA·cm^-2 for the steel after subzero treatment, indicating that the subzero treatment could reduce the corrosion resistance of the steel. The corrosion products for the steels before and after subzero treatment were composed of α-FeOOH, β-FeOOH, and γ-FeOOH. Therefore, low ambient temperature has certain degree of negative impact on the corrosion resistance of marine steel plate in extremely cold environments.

Key words： low temperature ship steel corrosion behavior cooling treatment immersion test electrochemistry test

收稿日期: 2019-01-12

ZTFLH:

TB304

基金资助:国家重点研发计划(2016YFB0300700);上海市教委曙光计划项目(19SG46);上海市自然科学基金(17ZR1440900);科技部国际合作交流项目(CU03-29)

通讯作者: 常雪婷 E-mail: xtchang@shmtu.edu.cn

Corresponding author: CHANG Xueting E-mail: xtchang@shmtu.edu.cn

作者简介: 沈树阳，男，1996年生，本科生

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引用本文:

沈树阳, 王东胜, 孙士斌, 杨剔, 赵前进, 王鑫, 张亚飞, 常雪婷. 深冷处理对EH40极寒环境船用钢板的海水腐蚀性能影响[J]. 中国腐蚀与防护学报, 2020, 40(2): 151-158.
Shuyang SHEN, Dongsheng WANG, Shibin SUN, Ti YANG, Qianjing ZHAO, Xin WANG, Yafei ZHANG, Xueting CHANG. Corrosion Behavior in Artificial Seawater of Subzero Treated EH40 Marine Steel Suitable for ExtremelyCold Environments. Journal of Chinese Society for Corrosion and protection, 2020, 40(2): 151-158.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2019.010 或 https://www.jcscp.org/CN/Y2020/V40/I2/151

图1 EH40钢样显微组织

图2 EH40船用钢板晶粒尺寸分布图

图3 未经和经深冷处理EH40钢试样去除腐蚀产物前后的微观形貌

图4 未经和经深冷处理EH40钢在海水中浸泡72 h后腐蚀产物形貌及组成

图5 原始的、未经和经过-80 ℃深冷处理再经浸泡后的EH40钢表面XRD谱

图6 经深冷处理后EH40钢的腐蚀形貌

图7 未经和经过深冷处理的EH40钢浸泡72 h的极化曲线

表1 极化曲线拟合结果

图8 未经和经过深冷处理的EH40钢样浸泡72 h后的电化学阻抗谱

表2 等效电路拟合结果

图 9 未经和经过-80 ℃处理的EH40钢试样微区电化学结果

图10 未经和经过-80 ℃深冷处理的EH40钢的腐蚀机理

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