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

doi:10.11902/1005.4537.2024.032

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

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

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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

Cite this article:

WANG Yuxue, ZHU Aohong, WANG Liwei, CUI Zhongyu. Comparative Study on Corrosion Behavior of Two Novel Ni-Cr-Mo-V Steels in Simulated Seawater Environment. Journal of Chinese Society for Corrosion and protection, 2024, 44(4): 918-926.

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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

Received: 22 January 2024 32134.14.1005.4537.2024.032

ZTFLH:

TG172

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

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	WANG Yuxue
	ZHU Aohong
	WANG Liwei
	CUI Zhongyu

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https://www.jcscp.org/EN/10.11902/1005.4537.2024.032 OR https://www.jcscp.org/EN/Y2024/V44/I4/918

Table 1 Chemical compositionof two Ni-Cr-Mo-V steels (mass fraction / % )

Fig.1 Microstructure morphologies of steel A (a) and steel B (b)

Fig.2 EBSD measurements for steel A (a1-d1) and steel B (a2-d2): (a1, a2) IPF orientation maps, (b1, b2) KAM maps, (c1, c2) grain boundary distribution maps, (d1, d2) grain size statistics

Fig.3 Nyquist diagram (a), Bode diagram (b), anodic (c) and cathodic (d) kinetic potential polarization curves of two steels in artificial seawater solution

Fig.4 Statistical results of inclusions size in two steels

Fig.5 SEM images and EDS results of inclusions in steel A (a) and steel B (b)

Fig.6 SEM morphologies of inclusions induced localized corrosion of steel A after immersion in artificial seawater solution for 5 s (a), 10 s (b), 30 s (c), 60 s (d), 600 s (e), 1200 s (f), 1800 s (g) and 3600 s (h)

Fig.7 SEM morphologies of active and inactive inclusions of steel A after 3600 s immersion: (a) macroscopic corrosion morphology, (b) inactive inclusions, (c) active inclusions

Fig.8 SEM morphologies and EDS results of active (a, c) and inactive (b, d) inclusions of steel A after immersion for 5 s (a, b) and 600 s (c, d)

Fig.9 SEM morphologies of inclusions induced localized corrosion of steel B after immersion in artificial seawater solution for 5 s (a), 10 s (b), 30 s (c), 60 s (d), 600 s (e), 1200 s (f), 1800 s (g) and 3600 s (h)

Fig.10 SEM morphologies (a, c) and CLSM results (b, d) of steel A (a, b) and steel B (c, d) after 24 h immersion

Fig.11 Surface (a, c) and cross-sectional (b, d) morphologies of steel A (a, b) and steel B (c, d) after 42 d immersion

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