Understanding the pitting mechanism of super ferritic stainless steel in bromide solutions: The role of Ti/Nb–Mo precipitates with a core–shell structure

Lei, Longlin; Shang, Bingang; Zheng, Kangkang; Wang, Xiangyu; Tan, Xin; Li, Jin; Jiang, Yiming; Sun, Yangting

doi:10.1016/j.corsci.2022.110176

Cited by 21 publications

(3 citation statements)

References 64 publications

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“…However, it is essential to note that while PREN offers a direct, efficient, and preliminary assessment of pitting resistance, it is a simplistic and empirical parameter 5,6 . PREN does not take into account factors such as surface roughness 13 and the presence of heterogeneous particles [14][15][16] . As a result, when comparing stainless steels with similar pitting resistance, reliance solely on PREN may lead to inaccurate conclusions.…”

Section: Introductionmentioning

confidence: 99%

Comparative Statistical Analysis of Pitting in Two 2205 Duplex Stainless Steel Variants

Sun,

Ran,

et al. 2023

Preprint

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The inherent variability of pitting poses challenges in accurately evaluating the pitting resistance due to potential disparities in test results. This study compares the pitting resistance of two commercial 2205 duplex stainless steels. Counterintuitively, 2205-B, despite having a higher Pitting Resistance Equivalent Number and better passive film performance, exhibited a lower Critical Pitting Temperature. Through the potentiostatic pulse test and potentiostatic polarization, it was observed that 2205-B had a greater number of pitting initiation sites. Further investigation, using SEM inclusion statistics, revealed an increased presence of inclusions rich in calcium oxides as the underlying cause of this unexpected phenomenon.

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Section: Introductionmentioning

confidence: 99%

Comparative Statistical Analysis of Pitting in Two 2205 Duplex Stainless Steel Variants

Sun,

Ran,

et al. 2023

Preprint

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“…Stainless steels are highly regarded in iconic buildings for their excellent performance in terms of structure, aesthetics, corrosion resistance, durability, and more [3][4][5][6]. Compared with austenitic stainless steels (ASS) and duplex stainless steels (DSS), super-ferritic stainless steels (SFSS), originally developed in 1970 for chloride-containing media, have a lower coe cient of thermal expansion, lower Ni element content, and lower production cost features [7][8][9]. Besides, the SFSS also showed a good corrosion resistance performance in an environment that contains chloride ions compared with the heat-resistant martensitic stainless steels (MSS) [2,3,6].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Properties of Super-Ferritic Stainless Steels Used for Marine Construction after Fire Exposure

Shen

2022

Advances in Materials Science and Engineering

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In this paper, the super-ferritic stainless steels (SFSSs) were simulating treated in a fire accident, and their mechanical properties and corrosion performance before/after fire exposure were studied. The experimental results demonstrated that SFSSs have a good combination property with the tensile strength, total elongation, and corrosion rate in FeCl3 solution of ∼600 MPa, ∼22.5%, and 0.03 mm/a. After fire exposure, the mechanical properties and corrosion performance were affected based on the exposure temperature due to the precipitation of intermetallic compounds. When the fire exposure temperature was 700–800°C, the plasticity was exasperated and the value decreased to only 1.5% at the condition of 800°C × 4 h due to the bulk σ-phase precipitation at grain boundaries. Meanwhile, the brittle fracture patterns emerged, and the corrosion rate in FeCl3 solution increased to 0.4 mm/a. When fire exposure takes place at 600°C for less than 4 h, the mechanical properties and the corrosion performance were little affected. Thus, it was possible to use SFSSs in marine environments.

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“…[1][2][3][4] However, owing to its complex service environment, local corrosion often occurs on the surface of 304ss, among which pitting corrosion is the most common. Researchers conducted various studies on the pitting corrosion of stainless steel [2,[5][6][7][8][9][10][11] and explored its influencing factors, [12][13][14][15][16][17][18] with surface roughness being one of the most important. [19][20][21][22] It is widely accepted that the larger the roughness, the worse the pitting resistance of the alloy.…”

Section: Introductionmentioning

confidence: 99%

Influence of the machined surface roughness on the pitting behavior of 304 stainless steel

Tan

Lan

Yao

et al. 2022

Materials & Corrosion

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The relationship between specimens with different machined surface roughness and pitting resistance was explored using the critical pitting temperature (CPT), critical pitting potential (E p ), and FeCl 3 pitting immersion tests. Compared with the arithmetic mean deviation of the surface contour (Ra), the depth-width ratio could characterize the mathematical relationship between the machined surface roughness and pitting parameters more simply. With an increase in the depth-width ratio, the CPT and E p of 304 stainless steel decreased, the average corrosion rate increased, the number of pits decreased, and the pit sizes increased.A larger depth-width ratio led to a larger effective diffusion length of metal cations in the pits, thus, the critical pitting criteria could be reached easily, which resulted in the reduction of the pitting resistance of 304 stainless steel.

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Understanding the pitting mechanism of super ferritic stainless steel in bromide solutions: The role of Ti/Nb–Mo precipitates with a core–shell structure

Cited by 21 publications

References 64 publications

Comparative Statistical Analysis of Pitting in Two 2205 Duplex Stainless Steel Variants

Comparative Statistical Analysis of Pitting in Two 2205 Duplex Stainless Steel Variants

Microstructure and Properties of Super-Ferritic Stainless Steels Used for Marine Construction after Fire Exposure

Influence of the machined surface roughness on the pitting behavior of 304 stainless steel

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