Corrosion Behavior of 1200 MPa Class Carbide-free Bainite Medium Manganese Steel for Offshore Platform

doi:10.11901/1005.3093.2024.146

Chinese Journal of Materials Research

2025, Vol. 39

Issue (1): 21-34 DOI: 10.11901/1005.3093.2024.146

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Corrosion Behavior of 1200 MPa Class Carbide-free Bainite Medium Manganese Steel for Offshore Platform

LI Yanyang¹, YU Chi¹(

), ZHAO Wei¹, GAO Xiuhua², DU Linxiu²

1 College of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao 066004, China
2 State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China

Cite this article:

LI Yanyang, YU Chi, ZHAO Wei, GAO Xiuhua, DU Linxiu. Corrosion Behavior of 1200 MPa Class Carbide-free Bainite Medium Manganese Steel for Offshore Platform. Chinese Journal of Materials Research, 2025, 39(1): 21-34.

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Abstract

A series of medium manganese test steels of non-carbide bainite structure were prepared by isothermal quenching heat treatment. The evolution of the inner- and outer-portion of corrosion products on the steels (1200 MPa class) and the effect of the microstructure of corrosion products on its corrosion resistance were studied via periodic immersion accelerated corrosion test in 3.5% NaCl solution and electrochemical corrosion measurement so that to simulate the corrosion situation encountered in the ocean splash zone. The results show that after being heated to 920 ^oC for 30 min and then quenched quickly in salt bath of 340 ^oC for 2 h, the steel presents an uniform and fine microstructure with clear lath boundaries, while its yield strength, tensile strength and elongation at breaking are 1297 MPa, 1402 MPa, and 29.3%, respectively. With the increase of corrosion time, the inner portion of corrosion products gradually changed from the loose porous γ-FeOOH in the initial stage to the dense α-FeOOH in the later stage of corrosion. The alloying elements beneficial for enhancing corrosion resistant such as Cr and Cu were enriched in the inner portion of the corrosion products, and stable compounds such as FeCr₂O₄ and CuFe₂O₄ were formed. With the increase of pre-corrosion treatment time, the corrosion current density first increases and then decreases, the corrosion potential first shifts negatively and then positively, the charge transfer resistance increases, and the protective effect of the corrosion product film is gradually enhanced. With the increase of the enrichment degree of corrosion resistant elements in the inner portion of corrosion products, the corrosion current density decreases, the charge transfer resistance increases, and the corrosion resistance increases.

Key words: material failure and protection ocean platform carbide-free bainite medium manganese steel corrosion products electrochemical corrosion

Received: 01 April 2024

ZTFLH:

TG172.5

Fund: Higher Educational Science and Technology Program of Hebei Province(ZD2020413)

Corresponding Authors: YU Chi, Tel: 18932571365, E-mail: yuchi@neuq.edu.cn

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	LI Yanyang
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	ZHAO Wei
	GAO Xiuhua
	DU Linxiu

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https://www.cjmr.org/EN/10.11901/1005.3093.2024.146 OR https://www.cjmr.org/EN/Y2025/V39/I1/21

Table 1 Composition analysis of experimental steels (%, mass fraction)

Fig.1 Temperature-expansion volume curve of the experimental steels

Table 2 Austenitic and martensitic transformation points of experimental steels

Table 3 Comprehensive mechanical properties of experimental steels

Fig.2 Microstructure morphologies of experimental steels after isothermal quenching at 340 ^oC for 2 h (a~c) metallographic microstructure of 1#、2#和3# sample; (d~f) SEM microstructure of 1#、2#和3# sample

Fig.3 Corrosion weight loss and Cumulative corrosion rate of experimental steels under different corrosion periods (a) loss of mass due to corrosion; (b) cumulative corrosion rate

Table 4 Corrosion weight loss of experimental steel under different corrosion cycles

Fig.4 XRD phase analysis of experimental steels corrosion products (a~c) phase of the outer membrane layer in 1#、2# and 3# sample; (d~f) phase of the inner membrane layer in 1#、2# and 3# sample

Fig.5 Macroscopic morphology of corrosion film on experimental steels under different corrosion cycles (a~c) macro morphology after corrosion for 72 h, 360 h and 576 h of 1# sample; (d~f) macro morphology after orrosion for 72 h, 360 h and 576 h of 2# sample; (g~i) macro morphology after orrosion for 72 h、360 h和576 h of 3# sample

Fig. 6 Micro-morphology of corrosion film on experimental steels under different corrosion cycles (a~c) micro morphology after corrosion for 72 h, 360 h and 576 h of 1# sample; (d~f) micro morphology after corrosion for 72 h, 360 h and 576 h of 2# sample; (g~i) micro morphology after corrosion for 72 h, 360 h and 576 h of 3# sample

Fig.7 Microstructure and EDS analysis of experimental steels after 576 h corrosion (a,d) micro morphology of 2# and 3# sample; (b, e) enlarged view of the red rectangular region in the microtopography and element distribution at point 1 of 2# and 3# sample; (c, f) element distribution at point 2 of 2# and 3# sample

Fig.8 Analysis of specific surface area and pore size of experimental steels under different corrosion periods (a) adsorption capacity and porosity of experimental steel 1# after corrosion for 72 h, 360 h and 576 h; (b) adsorption capacity and porosity of experimental steel 2# after corrosion for 72 h, 360 h and 576 h

Fig.9 Corrosion model of medium manganese steel in simulated ocean splash zone (a) 1#; (b) 2#; (c) 3#

Fig.10 Electrochemical Tafel polarization curves of experimental steels under different corrosion periods (a) 1#; (b) 2#; (c) 3#

Table 5 Tafel parameters corresponding to the polarization curves of experimental steels under different corrosion periods

Table 6 Open Circuit Potential (OCP) of experimental steels under different corrosion periods

Fig.11 Nyquist diagram and equivalent circuit diagram of experimental steels corrosion products under different corrosion periods (a~c) Nyquist plot of 1#、2#和3# sample; (d) equivalent circuit

Table 7 EIS curve fitting results of three experimental steels with different corrosion time (72~576 h)

Fig.12 Bode diagram of corrosion products of experimental steel under different corrosion periods (a, b) Bode modulus diagram and phase angle diagram of 1# sample; (c, d) Bode modulus diagram and phase angle diagram of 2# sample; (e, f) Bode modulus diagram and phase angle diagram of 3# sample

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