<strong>S420</strong>海工钢在不同海洋区带环境下的腐蚀行为研究

doi:10.11902/1005.4537.2023.192

中国腐蚀与防护学报

2024, Vol. 44

Issue (3): 635-644 CSTR: 32134.14.1005.4537.2023.192 DOI: 10.11902/1005.4537.2023.192

研究报告

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S420海工钢在不同海洋区带环境下的腐蚀行为研究

麻衡¹, 田会云²(

), 刘宇茜³, 王月香¹, 何康¹, 崔中雨², 崔洪芝²

1.莱芜钢铁集团银山型钢有限公司济南 271104
2.中国海洋大学材料科学与工程学院青岛 266100
3.青岛大学机电工程学院青岛 266071

Corrosion Behavior of S420 Steel in Different Marine Zones

MA Heng¹, TIAN Huiyun²(

), LIU Yuxi³, WANG Yuexiang¹, HE Kang¹, CUI Zhongyu², CUI Hongzhi²

1. Yinshan Section Steel Corporation of Laiwu Steel Group Ltd., Jinan 271104, China
2. School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China
3. College of Mechanical and Electrical Engineering, Qingdao University, Qingdao 266071, China

引用本文:

麻衡, 田会云, 刘宇茜, 王月香, 何康, 崔中雨, 崔洪芝. S420海工钢在不同海洋区带环境下的腐蚀行为研究[J]. 中国腐蚀与防护学报, 2024, 44(3): 635-644.
Heng MA, Huiyun TIAN, Yuxi LIU, Yuexiang WANG, Kang HE, Zhongyu CUI, Hongzhi CUI. Corrosion Behavior of S420 Steel in Different Marine Zones[J]. Journal of Chinese Society for Corrosion and protection, 2024, 44(3): 635-644.

全文: PDF(20844 KB) HTML

摘要:

通过1 a的青岛海域实海暴露实验，结合失重法、宏观和微观形貌、三维形貌和腐蚀产物分析，开展了S420钢在大气、飞溅、潮差和全浸4个不同海洋区带下的腐蚀行为研究。结果表明：S420钢在潮差环境中腐蚀速率最高，大气环境下腐蚀速率最低。一方面，这主要归因于锈层具有持水能力，为阴极反应提供充足的水介质，另一方面，潮差环境的干湿循环使得表面薄液膜中Cl^-浓度增加，同时加速了氧的传质过程，促进了腐蚀阴阳极反应速率。腐蚀产物主要由γ-Fe₂O₃、Fe₃O₄以及α/γ-FeOOH组成。电解液层的持续存在有利于γ-FeOOH的形成，使其在潮差和全浸环境中占主导地位。充足的氧气和干湿循环促进了Fe₃O₄的生成，导致其在飞溅环境中以主要形式存在。S420钢在潮差环境下表现出最大点蚀深度和高点蚀体积的局部腐蚀特性。

关键词 ：低合金钢, 海洋腐蚀, 点蚀, 锈层, 腐蚀速率

Abstract：

The effect of diverse marine zones on the corrosion behavior of low alloy steels exhibits unique environmental characteristics, leading to significant differences in the corrosion rate of steels, as well as the composition and structure of rust scales. In this paper, the corrosion behavior of S420 steel, exposed in four different marine zones, i.e. atmospheric, splash, tidal, and immersion zones in the sea area of Qingdao by 36° 06' N and 120° 25' E for one year, was assessed by means of mass loss measurement, macroscopic and microscopic morphology observation, three-dimensional morphology detection, and corrosion product analysis. The results show that S420 steel exhibits the highest corrosion rate in the tidal zone and the lowest corrosion rate in marine atmosphere. Which may be attributed to the water-holding ability of the rust scale, thus providing sufficient electrolyte for the cathodic reaction. On the other hand, in the tidal zone, the wet-dry cycle results in the increase of the Cl^- concentration, accelerating the anodic reaction. The formed corrosion products are mainly composed of γ-Fe₂O₃, Fe₃O₄ and α/γ-FeOOH. The persistent presence of the electrolyte film may facilitate the formation of γ-FeOOH, making it dominant in the rust scales formed in tidal zone and full immersion zone. In the splash zone, the production of Fe₃O₄ may be promoted due to the synergist of adequate oxygen supply and wet-dry cycle, thus Fe₃O₄ is dominant in the formed rust scale. In the marine atmosphere, the thickness of the formed rust scale is the smallest, and the value of α/γ^* is the largest, which has protective effect against further corrosion of the steel substrate to certain extent. In the tidal zone, the thickness of the formed rust scale is the highest and the value of α/γ^* is the lowest, which is loose and porous, and the number and width of cracks within the rust scale are larger and wider, resulting in worst protective effect for the substrate. In other words, the S420 steel exhibits obvious localized corrosion characteristics with the maximum depth and high volume of pits in the tidal zone.

Key words： low alloy steel marine corrosion pitting corrosion rust layer corrosion rate

收稿日期: 2023-06-09 32134.14.1005.4537.2023.192

ZTFLH:

TG178

基金资助:2021年度泰山产业领军人才项目和山东省重点研发项目(2020CXGC010305)

通讯作者: 田会云，E-mail: tianhuiyun@ouc.edu.cn，研究方向为海洋环境腐蚀与应力腐蚀开裂行为

Corresponding author: TIAN Huiyun, E-mail: tianhuiyun@ouc.edu.cn

作者简介: 麻衡，男，1985年生，正高级工程师

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https://www.jcscp.org/CN/10.11902/1005.4537.2023.192 或 https://www.jcscp.org/CN/Y2024/V44/I3/635

图1 S420钢的宏观腐蚀形貌

图2 S420钢在大气、飞溅、潮差和全浸环境中暴露1 a后的腐蚀速率

图3 S420钢在大气区、飞溅区、潮差区和全浸区中腐蚀1 a后腐蚀产物的腐蚀形貌

图4 S420钢在大气区、飞溅区、潮差区和全浸区4种环境下暴露1 a后的腐蚀产物截面形貌及EDS结果

图5 S420钢在大气区、飞溅区、潮差区和全浸区暴露1 a后去除腐蚀产物后的表面形貌和3D轮廓

图6 S420钢在不同环境下腐蚀1 a后蚀坑深度和体积的累计概率分布

图7 S420钢在不同环境下腐蚀1 a后腐蚀产物的XRD谱以及不同组成相和α/γ*的比值

表1 锈层对应物相的Raman光谱[18,24-26]

图8 S420钢在大气区、飞溅区、潮差区和全浸区环境下腐蚀1 a后腐蚀产物的物相分布

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