两种新型<strong>Ni-Cr-Mo-V</strong>钢在模拟海水环境中的腐蚀行为对比研究

doi:10.11902/1005.4537.2024.032

中国腐蚀与防护学报

2024, Vol. 44

Issue (4): 918-926 CSTR: 32134.14.1005.4537.2024.032 DOI: 10.11902/1005.4537.2024.032

研究报告

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两种新型Ni-Cr-Mo-V钢在模拟海水环境中的腐蚀行为对比研究

王玉雪¹, 朱澳鸿², 王力伟¹(

), 崔中雨²

1.青岛大学机电工程学院青岛 266071
2.中国海洋大学材料科学与工程学院青岛 266100

Comparative Study on Corrosion Behavior of Two Novel Ni-Cr-Mo-V Steels in Simulated Seawater Environment

WANG Yuxue¹, ZHU Aohong², WANG Liwei¹(

), CUI Zhongyu²

1. College of Mechanical and Electrical Engineering, Qingdao University, Qingdao 266071, China
2. School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China

引用本文:

王玉雪, 朱澳鸿, 王力伟, 崔中雨. 两种新型Ni-Cr-Mo-V钢在模拟海水环境中的腐蚀行为对比研究[J]. 中国腐蚀与防护学报, 2024, 44(4): 918-926.
Yuxue WANG, Aohong ZHU, Liwei WANG, Zhongyu CUI. Comparative Study on Corrosion Behavior of Two Novel Ni-Cr-Mo-V Steels in Simulated Seawater Environment[J]. Journal of Chinese Society for Corrosion and protection, 2024, 44(4): 918-926.

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摘要:

采用浸泡实验、电化学实验和微观形貌观察研究了两种Ni-Cr-Mo-V钢(A钢和B钢)在海水环境下的腐蚀行为与机制。结果表明，两种钢腐蚀阳极和阴极电化学过程一致，但B钢表现出较正的腐蚀电位和较低的腐蚀电流密度。A钢中夹杂物类型为CaS-MgO-Al₂O₃，尺寸在3~5 μm之间，活性夹杂物引发局部腐蚀；B钢主要为Al₂O₃夹杂物，其尺寸在1~3 μm之间，且诱发局部腐蚀的程度较轻。长周期腐蚀42 d后，两种钢均发生均匀腐蚀。两种钢腐蚀产物层分为致密的内锈层和疏松的外锈层，A钢锈层厚度大于B钢，且A钢中内锈层中纵向分布的裂纹降低了锈层的保护性。

关键词 ： Ni-Cr-Mo-V钢, 夹杂物, 锈层, 腐蚀行为

Abstract：

The corrosion behavior of two novel Ni-Cr-Mo-V steels (steel A and steel B) in a simulated seawater environment was comparatively investigated by means of immersion test, electrochemical test, and microscopic observation. The results indicate that the cathodic and anodic electrochemical processes in the corrosion process of the two steels are consistent, while the steel B shows a more positive corrosion potential and lower corrosion current density. The main inclusions in steel A is CaS-MgO-Al₂O₃ with sizes ranging from 3 to 5 μm, which act as active sites of localized corrosion initiation; in comparison, the Al₂O₃ inclusions in steel B with sizes ranging from 1 μm to 3 μm, the tendency of localized corrosion induced by which is relatively light. After long-term corrosion for 42 d, the two steels all show uniform corrosion with bilayered corrosion product scale composed of a dense inner rust layer and a loose outer rust layer. However, the thickness of the rust scale of steel A was greater than that of steel B. Besides, there existed longitudinal cracks in the inner rust layer of steel A, which may deteriorate the protective property of the rust scale.

Key words： Ni-Cr-Mo-V steel inclusion rust layer corrosion behavior

收稿日期: 2024-01-22 32134.14.1005.4537.2024.032

ZTFLH:

TG172

通讯作者: 王力伟，E-mail：ustbwangliwei@126.com，研究方向为材料自然环境腐蚀失效机理

Corresponding author: WANG Liwei, E-mail: ustbwangliwei@126.com

作者简介: 王玉雪，女，1997年生，硕士生

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表 1 实验中所用两种Ni-Cr-Mo-V钢的化学成分

图1 两种钢的微观组织形态

图2 两种钢基于EBSD测量的IPF取向图，KAM图，晶界分布图和晶粒尺寸统计图

图3 两种合金钢在人工海水溶液中的Nyquist图，Bode图，动电位极化曲线阳极图和极化曲线阴极图

图4 两种钢中夹杂物尺寸统计结果

图5 两种钢中夹杂物的SEM形貌和EDS结果

图6 A钢在人工海水溶液中浸泡不同时间后夹杂物诱发局部腐蚀的SEM形貌

图7 A钢浸泡3600 s后的活性夹杂物和非活性夹杂物SEM形貌及EDS结果

图8 A钢浸泡5 s和600 s后活性夹杂物和非活性夹杂物的SEM形貌

图9 B钢在人工海水溶液中浸泡不同时间后夹杂物诱发局部腐蚀的SEM形貌

图10 两种钢浸泡24 h后的SEM形貌和CLSM结果

图11 两种钢浸泡42 d后的表面和截面形貌

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