Corrosion Behavior of a Novel Cu-Mo Weathering Steel in an Artificial Marine Atmosphere

doi:10.11902/1005.4537.2022.170

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (3): 507-515 DOI: 10.11902/1005.4537.2022.170

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Corrosion Behavior of a Novel Cu-Mo Weathering Steel in an Artificial Marine Atmosphere

WANG Hanmin, HUANG Feng(

), YUAN Wei, ZHANG Jiawei, WANG Xinyu, LIU Jing

Hubei Engineering Technology Research Center of Marine Materials and Service Safety, The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China

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Abstract

The long-term corrosion behavior of a novel Cu-Mo test steel in an artificial marine atmosphere was studied by means of dry-wet alternate periodic immersion test, field emission scanning electron microscopy (FE-SEM), field emission electron probe (FE-EPMA), X-ray diffractometer (XRD), Raman spectroscopy (Raman) and electrochemical test. The results show that the Cu-Mo test steel presents a microstructure composed mainly of polygonal ferrite and a small amount of lamellar pearlite, while the counterpart Cr-containing weathering steel presents a microstructure composed mainly of bainite and ferrite. The corrosion process of the Cu-Mo test steel can be divided into two stages: acceleration and deceleration. In the early stage of corrosion, the corrosion resistance of the Cu-Mo test steel is inferior to that of the ordinary Cr-containing weathering steel. At the later stage of corrosion, the enrichment of Cu and Mo occurred in the Cu-Mo test steel, thereby resulted in the increase of α-FeOOH, which enhanced the protectiveness of the rust layer, therefore the corrosion rate of the Cu-Mo test steel decreased. In a word, the new Cu-Mo test steel presents better weathering resistance rather than that of the ordinary Cr-containing weathering steel.

Key words: Cu-Mo test steel marine atmosphere corrosion resistance

Received: 29 May 2022 32134.14.1005.4537.2022.170

ZTFLH:

TG172

Fund: Hubei Natural Science Foundation Science and Technology Innovation Group(2021CFA023)

Corresponding Authors: HUANG Feng, E-mail: huangfeng@wust.edu.cn

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	WANG Hanmin
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	YUAN Wei
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	WANG Xinyu
	LIU Jing

Cite this article:

WANG Hanmin, HUANG Feng, YUAN Wei, ZHANG Jiawei, WANG Xinyu, LIU Jing. Corrosion Behavior of a Novel Cu-Mo Weathering Steel in an Artificial Marine Atmosphere. Journal of Chinese Society for Corrosion and protection, 2023, 43(3): 507-515.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2022.170 OR https://www.jcscp.org/EN/Y2023/V43/I3/507

Table 1 Main chemical compositions of three steels (mass fraction / %)

Fig.1 Microstructural images of new Cu-Mo test steel (a), Cr-bearing weathering steel (b) and Q355C steel (c)

Fig.2 Average corrosion rate of three steels changes with time

Fig.3 Micromorphologies of rust layer surface of new Cu-Mo test steel (a1, b1), Cr-bearing weathering steel (a2, b2) and Q355C steel (a3, b3) after corrosion for 768 h (b1, b2 and b3 are local enlargements of a1, a2 and a3, respectively)

Fig.4 Cross-sectional morphologies and element distribution of rust layers of new Cu-Mo test steel (a), Cr-bearing weathering steel (b) and Q355C steel (c) after immersion for 768 h

Fig.5 XRD patterns (a) and semi-quantiative analysis of XRD patterns of rust layers (b) of three steels after 768 h corrosion

Fig.6 Phase distribution of rust layer cross section of new Cu-Mo test steel (a), Cr-bearing weathering steel (b) and Q355C steel (c) after 768 h corrosion

Fig.7 Nyquist (a) and Bode (b) spectrums of three steels after 768 h corrosion

Fig.8 Equivalent circuit for fitting EIS spectra (a) and EIS fitting results (b) of three steels after 768 h corrosion

Fig.9 Corrosion depth-time double logarithmic curves of new Cu-Mo test steel (a), Cr-bearing weathering steel (b) and Q355C steel (c)

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