极地低温海洋大气环境下<strong>Ni-Cr-Mo-V</strong>钢腐蚀行为与室内外相关性研究

doi:10.11902/1005.4537.2023.057

中国腐蚀与防护学报

2024, Vol. 44

Issue (1): 91-99 CSTR: 32134.14.1005.4537.2023.057 DOI: 10.11902/1005.4537.2023.057

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极地低温海洋大气环境下Ni-Cr-Mo-V钢腐蚀行为与室内外相关性研究

冷文俊¹^,², 石西召¹, 辛永磊², 杨延格³, 王利², 崔中雨¹(

), 侯健²

^1.中国海洋大学材料科学与工程学院青岛 266100
^2.中国船舶集团有限公司第七二五研究所海洋腐蚀与防护重点实验室青岛 266237
^3.中国科学院金属研究所师昌绪先进材料创新中心沈阳 110016

Correlation of Corrosion Information Aquired by Indoor Acceleration Testing and by Real Low Temperature Marine Atmosphere Exposure in Polar Region for Ni-Cr-Mo-V Steel

LENG Wenjun¹^,², SHI Xizhao¹, XIN Yonglei², YANG Yange³, WANG Li², CUI Zhongyu¹(

), HOU Jian²

^1.School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China
^2.Science and Technology on Marine Corrosion and Protection Laboratory, Luoyang Ship Material Research Institute, Qingdao 266237, China
^3.Shi -changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

引用本文:

冷文俊, 石西召, 辛永磊, 杨延格, 王利, 崔中雨, 侯健. 极地低温海洋大气环境下Ni-Cr-Mo-V钢腐蚀行为与室内外相关性研究[J]. 中国腐蚀与防护学报, 2024, 44(1): 91-99.
Wenjun LENG, Xizhao SHI, Yonglei XIN, Yange YANG, Li WANG, Zhongyu CUI, Jian HOU. Correlation of Corrosion Information Aquired by Indoor Acceleration Testing and by Real Low Temperature Marine Atmosphere Exposure in Polar Region for Ni-Cr-Mo-V Steel[J]. Journal of Chinese Society for Corrosion and protection, 2024, 44(1): 91-99.

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摘要:

通过腐蚀失重、扫描电镜、激光共聚焦显微镜等测试方法对Ni-Cr-Mo-V钢在室内加速试验和中山站户外暴露试验后的腐蚀行为进行了对比研究。结果表明：Ni-Cr-Mo-V低合金高强钢在极地低温大气环境下腐蚀速率为11.3 μm/a，腐蚀产物由Fe₃O₄、γ-FeOOH、α-FeOOH和β-FeOOH组成，腐蚀产物中大量的β-FeOOH表明低温环境下生成的锈层保护性较差。低温大气腐蚀以均匀腐蚀为主，冻融循环引起试样表面的电解质浓度变化，导致了锈层下点蚀的形成。在冻融循环过程中，锈层中水分由于固液相变引起的应力变化以及锈层与金属基体热胀系数的不同导致了锈层开裂。

关键词 ：极地环境, 加速腐蚀, 腐蚀产物, 冻融循环

Abstract：

In order to investigate the applicability of the proposed indoor accelerated test spectrum, which aims to simulate the low temperature marine environment in the polar region, and the corrosion mechanism of low alloy steel exposed in the real polar low temperature atmospheric environment, therefore, the Ni-Cr-Mo-V steels were subjected to indoor accelerated test in lab and to outdoor exposure test in Zhongshan station at the polar region respectively, then the corrosion behavior of the tested steels was comparatively studied by means of mass loss measurement, scanning electron microscope, and laser confocal microscope. The results revealed that the corrosion rate of the steel is 11.3 μm/a, and the corrosion products are composed of Fe₃O₄, γ-FeOOH, α-FeOOH and β-FeOOH. The presence of the large amount of β-FeOOH indicates that the rust scale formed in low temperature environment has poor protectiveness. The low temperature atmospheric corrosion is mainly uniform corrosion. The freeze-thaw cycle causes the alteration of electrolyte concentration on the surface of test steel, which results in the formation of pitting corrosion beneath the rust scale. During the freeze-thaw cycle, the alternation of stresses caused by the cyclical solid-liquid phase transition of the water in the rust scale and the difference of the thermal expansion coefficient between the rust scale and the metal matrix could lead to the cracking of the rust scale.

Key words： polar environment accelerated corrosion corrosion products freeze-thaw cycle

收稿日期: 2023-03-03 32134.14.1005.4537.2023.057

ZTFLH:

TG174

基金资助:山东省重大科技创新工程项目(2020CXGC010305);山东省优秀青年科学基金(ZR2022YQ44)

通讯作者: 崔中雨，E-mail：cuizhongyu@ouc.edu.cn，研究方向为极端海洋环境腐蚀与敏感断裂

Corresponding author: CUI Zhongyu, E-mail: cuizhongyu@ouc.edu.cn

作者简介: 冷文俊，男，1998年生，硕士生

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图1 2019-2021年中山站大气环境

图2 极地室内模拟加速环境试验箱及环境谱周期示意图

图3 Ni-Cr-Mo-V钢室内加速试验谱腐蚀1周期与中山站大气腐蚀1 a腐蚀速率对比

表1 钢铁材料在不同大气环境下的腐蚀速率

图4 不同环境下Ni-Cr-Mo-V钢腐蚀产物的表面形貌

图5 不同环境下Ni-Cr-Mo-V钢腐蚀产物的截面形貌

图6 不同环境下Ni-Cr-Mo-V钢的表面腐蚀形貌

图7 室内模拟及南极大气环境下Ni-Cr-Mo-V钢腐蚀产物XRD及物相组成的半定量分析结果

图8 低温及冰雪凝-融环境下的大气腐蚀机理

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