Effect of Different Surface Treatments on Corrosion Behavior of 300M Steel in Qingdao Marine Atmosphere

doi:10.11902/1005.4537.2019.032

Journal of Chinese Society for Corrosion and protection

2019, Vol. 39

Issue (6): 504-510 DOI: 10.11902/1005.4537.2019.032

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Effect of Different Surface Treatments on Corrosion Behavior of 300M Steel in Qingdao Marine Atmosphere

ZHAO Jinbin¹,ZHAO Qiyue²,CHEN Linheng¹,HUANG Yunhua²(

),CHENG Xuequn²,LI Xiaogang²

1. Jiangsu Key Laboratory for Premium Steel Material, Nanjing Iron & Steel Co. , Ltd. , Nanjing 211500, China
2. Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China

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Abstract

Atmospheric exposure of three types of 300M steel with different surface treatments (bare material, Cd-Ti Plating of low hydrogen embrittlement, high-velocity oxygen-fuel (HVOF) sprayed WC-10Co4Cr coating) were conducted for 2 a in Qingdao marine atmosphere. Then the corroded steels were characterized via surface and cross-section morphology observation and corrosion products analysis. The results of the two-year atmospheric exposure test are as follow: the HVOF sprayed WC-10Co4Cr coating peeled off, while galvanic corrosion and crevice corrosion occurred between the coating and the substrate which acted as anode, and the corrosion rate was the fastest and the corresponding corrosion pits were the deepest. While the corrosion potential of the Cd-Ti plated steel was lower than that of the substrate, and the plating was corroded prior to the substrate. The corrosion rate of the plated steel was the slowest and the corresponding corrosion pits were shallow, which indicated that the protective effect of Cd-Ti plating was the best among the three. The corrosion products on the bare steel as well as the substrate beneath the HVOF coating were mainly composed of α-FeOOH, β-FeOOH, γ-FeOOH and Fe₃O₄, but Cd(OH)₂ and CdO₂ were also appeared on the surface of the steel with Cd-Ti plating. The protective effect of Cd-Ti plating was obvious because of sacrificial anode protection, but the HOVF sprayed WC-10Cr4Cr caused galvanic corrosion and crevice corrosion, which aggravated the corrosion of the substrate.

Key words: 300M steel low hydrogen embrittlement Cd-Ti plating high-velocity oxygen-fuel sprayed marine atmospheric corrosion

Received: 12 March 2019

ZTFLH:

TG172

Fund: Supported by National Natural Science Foundation of China(51971033);National Key R&D Program of China(2016YFB0300604);National Materials Corrosion and Protection Data Center

Corresponding Authors: Yunhua HUANG E-mail: huangyh@mater.ustb.edu.cn

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Cite this article:

ZHAO Jinbin,ZHAO Qiyue,CHEN Linheng,HUANG Yunhua,CHENG Xuequn,LI Xiaogang. Effect of Different Surface Treatments on Corrosion Behavior of 300M Steel in Qingdao Marine Atmosphere. Journal of Chinese Society for Corrosion and protection, 2019, 39(6): 504-510.

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https://www.jcscp.org/EN/10.11902/1005.4537.2019.032 OR https://www.jcscp.org/EN/Y2019/V39/I6/504

Table 1 Environmental data of Tuandao during the experiment (monthly average)

Fig.1 Macro morphologies of 300M steels treated with different surface treatments: (a) 1#, (b) 2#, (c) 3# coated sample, (d) 3# substrate surface after peeling off the coating in Qingdao marine atmosphere for 2 a

Fig.2 Micro morphologies of 300M steels treated with different surface treatments: (a) 1#; (b) 2#; (c) 3# coated sample； (d) 3# substrate surface after peeling off the coating in Qingdao marine atmosphere for 2 a; (e) distribution of elements of 2# products

Fig.3 Section morphology (a) and EDX result of point A in Fig.3a (b) after exposure in Qingdao marine atmosphere for 2 a

Fig.4 Section morphology (a) and EDX result of point B in Fig.4a (b) after exposure in Qingdao marine atmosphere for 2 a

Fig.6 Open circuit potential of the three experiment materials in simulated solution

Fig.5 Section morphologies of 3# sample stripped coating (a) and substrate surface after peeling off the coating (b) and EDX results of points C (c), D (d) and E (e) after exposure in Qingdao marine atmosphere for 2 a

Fig.7 XRD patterns of the products formed on 1# (a), 2# (b) and 3# (c) 300M steels treated with different surface treatments after exposure in Qingdao marine atmosphere for 2 a

Fig.8 Corrosion pit depth distribution of 1# (a), 2# (b) and 3# (c) 300M steels treated with different surface treatments after exposure in Qingdao marine atmosphere for 2 a

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