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
Comparative Study on Corrosion Behavior of Two Novel Ni-Cr-Mo-V Steels in Simulated Seawater Environment
王玉雪 1朱澳鸿 2王力伟 1崔中雨2
作者信息
- 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
- 折叠
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.
Abstract
The corrosion behavior of two novel Ni-Cr-Mo-V steels(steel A and steel B)in a simulat-ed seawater environment was comparatively investigated by means of immersion test,electrochemical test,and microscopic observation.The results indicate that the cathodic and anodic electrochemical pro-cesses 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 in-duced by which is relatively light.After long-term corrosion for 42 d,the two steels all show uniform corro-sion 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.
关键词
Ni-Cr-Mo-V钢/夹杂物/锈层/腐蚀行为Key words
Ni-Cr-Mo-V steel/inclusion/rust layer/corrosion behavior引用本文复制引用
出版年
2024
NETL
NSTL
万方数据