Microstructure and Corrosion Resistance of Hot Rolled Cr/Ni Micro-alloying High Strength Weathering Steel

doi:10.11902/1005.4537.2016.248

Journal of Chinese Society for Corrosion and protection

2018, Vol. 38

Issue (1): 39-46 DOI: 10.11902/1005.4537.2016.248

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Microstructure and Corrosion Resistance of Hot Rolled Cr/Ni Micro-alloying High Strength Weathering Steel

Yue WANG¹, Zili LIU¹(

), Xiqin LIU¹, Shoudong ZHANG¹, Qinchao TIAN²

1 Institute of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
2 Institute of Materials Science and Engineering, Shanghai University, Shanghai 200444, China

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Abstract

The microstructure and corrosion resistance of hot rolled Cr/Ni micro-alloyed high strength weathering steels Q500H and Q700H were studied by means of electrochemical test, immersion test, SEM, EDS and XRD. Results showed that the two hot rolled high strength weathering steels present the same microstructure composed of pearlite and ferrite, while Cr was distributed evenly in the above mentioned two phases, and Ni was more rich in ferrite phase. The Q700H weathering steel with higher Cr- and Ni-content showed lower annual corrosion rate. After immersion in 3.5%(mass fraction) NaCl solution for 60 d, the corrosion current density of the two steels increased, but Q700H weathering steel has higher charge transfer resistance and smaller corrosion current density. The corrosion pits on the surface of Q700H steel was smaller after 150 d immersion. The increase of Cr- and Ni-content promoted the for mation of α-FeOOH, which was dense and stable. Cr was concentrated in the inner rust layer, Ni was enriched at the interface between the substrate and the rust layer, the higher the content of Cr and Ni was, the much obvious enrichment they had.

Key words: hot rolled low alloy high strength weathering steel Cr and Ni micro-alloying corrosion resistance

Received: 27 December 2016

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Cite this article:

Yue WANG, Zili LIU, Xiqin LIU, Shoudong ZHANG, Qinchao TIAN. Microstructure and Corrosion Resistance of Hot Rolled Cr/Ni Micro-alloying High Strength Weathering Steel. Journal of Chinese Society for Corrosion and protection, 2018, 38(1): 39-46.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2016.248 OR https://www.jcscp.org/EN/Y2018/V38/I1/39

Table 1 Chemical compositions of Q500H and Q700H steels (mass fraction / %)

Fig.1 Schematic of suspension of tested steel samples in 3.5%NaCl solution

Fig.2 SEM images of hot rolled Q500H (a) and Q700H (b, c) steels, and EDS linear scannings of Ni and Cr cross the phase boundary of Q700H steel as shown in Fig.2c (d)

Table 2 Corrosion rates of Q500H and Q700H steels during 150 d immersion in 3.5%NaCl solution

Fig.3 Polarization curves of Q500H and Q700H steels before and after immersion in 3.5%NaCl solution for 60 d

Table 3 Fitting results of polarization curves of Q500H and Q700H steels

Table 4 Fitting results of EIS of Q500H and Q700H steels after immersion in 3.5%NaCl solution for different time

Fig.4 Nyquist diagrams of Q500H and Q700H steels after immersion in 3.5%NaCl solution for 0 d (a), 10 d (b), 60 d (c) and corresponding equivalent circuit (d)

Fig.5 Macroscopic surface morphologies of Q500H (a, b) and Q700H (c, d) steels before (a, c) and after (b, d) removal of corrosion products formed during immersion in 3.5%NaCl solution for 150 d

Fig.6 XRD patterns of the corrosion products formed on Q500H and Q700H steels after immersion in 3.5%NaCl solution for 150 d

Fig.7 Rust morphologies with different immersion times and the EDS analysis for the cross section of therust layer: (a) Q500H steel, 5 d; (b) Q700H steel, 5 d; (c) Q500H steel, 10 d; (d) Q700H steel, 10 d; (e) the cross section morphology of Q500H for 150 d; (f) the cross section morphology of Q700H for 150 d; (g) the element distribution of Cr for Q500H; (h) the element distribution of Ni for Q500H; (i) the element distribution of Cr for Q700H; (j) the element distribution of Ni for Q700H

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