High-Temperature Heat-Treatment at 1673 K: Improvement of Pitting Corrosion Resistance at Inclusions of Type 304 Stainless Steel under Applied Stress

Tokuda, Setsuko; Muto, Izumi; Sugawara, Yu; Hara, Nobuyoshi

doi:10.2320/matertrans.mt-m2021232

Cited by 11 publications

(4 citation statements)

References 18 publications

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“…In addition, controlling the chemical compositions of inclusions by heat treatment is believed to simultaneously improve corrosion resistance and other properties. [46][47][48][49]…”

Section: Modification Of Sulfide Inclusions To Improve Their Electroc...mentioning

confidence: 99%

Review—Understanding and Controlling the Electrochemical Properties of Sulfide Inclusions for Improving the Pitting Corrosion Resistance of Stainless Steels

2023

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This paper reviews recent studies on the relationships between local electrochemical properties at the steel/inclusion boundary and pitting corrosion resistance of stainless steels. The effect of Mo addition to the steel matrix on the local dissolution behavior at the steel/inclusion boundary is explained. The inhibition of inclusion dissolution is beneficial for improving the pitting corrosion resistance of stainless steels. The importance of spark plasma sintering and microelectrochemical techniques in the research on localized corrosion processes are briefly discussed. We also discuss novel methods for improving the pitting corrosion resistance of stainless steels, such as the addition of corrosion inhibitors.

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“…In addition, controlling the chemical compositions of inclusions by heat treatment is believed to simultaneously improve corrosion resistance and other properties. [46][47][48][49]…”

Section: Modification Of Sulfide Inclusions To Improve Their Electroc...mentioning

confidence: 99%

Review—Understanding and Controlling the Electrochemical Properties of Sulfide Inclusions for Improving the Pitting Corrosion Resistance of Stainless Steels

2023

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“…Pitting corrosion was generated at 0.13 V. The measurements with a 1 × 1 mm electrode area were made six times, and pitting occurred in two cases. A small electrode would be suitable for detecting the increase in current due to pitting with high sensitivity 55,56 . By stopping the polarization when a slight increase in current is detected, an early stage of pitting corrosion can be observed.…”

Section: Necessity Of Inclusions In Pit Initiationmentioning

confidence: 99%

Micro-electrochemical insights into pit initiation site on aged UNS S32750 super duplex stainless steel

et al. 2023

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An aging treatment of UNS S32750 super duplex stainless steel at 1173 K for 1.0 ks produced σ and secondary austenite (γ2) phases in the α and γ phase boundary regions. Small amount of Mn-Cr oxide and MnS complex inclusions were present in the steel. No pitting was observed during the potentiodynamic polarization of a small area (200 × 200 µm) without inclusions in 1 M MgCl2 at 348 K. Because the electrode area included α, γ, σ, and γ2 phases, these phases and their boundaries alone could not act as initiation sites for pitting. The electrode area size was gradually reduced from 3 × 3 mm to 1 × 1 mm, and pitting corrosion was observed to occur at the Mn-Cr oxide and MnS complex inclusions in a region that appeared to be the γ2 phase near the σ phase.

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“…7. These inclusions primarily comprise elements of (Mg-Al-Ca-Si)-O, potentially sourced from smelting residues of deoxidizing agents like Mg, Al, and Si [52][53][54][55] . Within the inclusion, MgO often manifests as an irregular polygonal structure (as depicted in Fig.…”

Section: Oxide Inclusion Characteristics Of 2205mentioning

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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High-Temperature Heat-Treatment at 1673 K: Improvement of Pitting Corrosion Resistance at Inclusions of Type 304 Stainless Steel under Applied Stress

Cited by 11 publications

References 18 publications

Review—Understanding and Controlling the Electrochemical Properties of Sulfide Inclusions for Improving the Pitting Corrosion Resistance of Stainless Steels

Review—Understanding and Controlling the Electrochemical Properties of Sulfide Inclusions for Improving the Pitting Corrosion Resistance of Stainless Steels

Micro-electrochemical insights into pit initiation site on aged UNS S32750 super duplex stainless steel

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

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