The role of applied stress in the anodic dissolution of sulfide inclusions and pit initiation of stainless steels

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

doi:10.1016/j.corsci.2021.109312

Cited by 25 publications

(16 citation statements)

References 64 publications

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“…However, when the immersion period was over 10 days, the Mg ion contents increased with the extension of immersion times in dynamic immersion, while the Mg ion concentration in static immersion tests was maintained at a relatively low level in the immersion period of 10 to 30 days. These results are also attributed to the gradual formation of the protective corrosion products layer and the destructive effect of the dynamic environment on the protective layer [ 32 , 33 ]. Above all, the dynamic environment will cause a higher degradation rate and a faster Mg ion release than its static counterparts.…”

Section: Resultsmentioning

confidence: 99%

Effect of the Combination of Torsional and Tensile Stress on Corrosion Behaviors of Biodegradable WE43 Alloy in Simulated Body Fluid

Wang

Gao

Pan³

et al. 2023

JFB

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The real physiological environment of the human body is complicated, with different degrees and forms of loads applied to biomedical implants caused by the daily life of the patients, which will definitely influence the degradation behaviors of Mg-based biodegradable implants. In the present study, the degradation behaviors of modified WE43 alloys under the combination of torsional and tensile stress were systematically investigated. Slow strain rate tensile tests revealed that the simulated body fluid (SBF) solution could deteriorate the ultimate tensile stress of WE43 alloy from 210.1 MPa to 169.2 MPa. In the meantime, the fracture surface of the specimens tested in the SBF showed an intergranular corrosion morphology in the marginal region, while the central area appeared not to have been affected by the corrosive media. The bio-degradation performances under the combination of torsional and tensile stressed conditions were much more severe than those under unstressed conditions or single tensile stressed situations. The combination of 40 MPa tensile and 40 MPa torsional stress resulted in a degradation rate over 20 mm/y, which was much higher than those under 80 MPa single tensile stress (4.5 mm/y) or 80 MPa single torsional stress (13.1 mm/y). The dynamic formation and destruction mechanism of the protective corrosion products film on the modified WE43 alloy could attribute to the exacerbated degradation performance and the unique corrosion morphology. The dynamic environment and multi-directional loading could severely accelerate the degradation process of modified WE43 alloy. Therefore, the SCC susceptibility derived from a single directional test may be not suitable for practical purposes. Complex external stress was necessary to simulate the in vivo environment for the development of biodegradable Mg-based implants for clinical applications.

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Section: Resultsmentioning

confidence: 99%

Effect of the Combination of Torsional and Tensile Stress on Corrosion Behaviors of Biodegradable WE43 Alloy in Simulated Body Fluid

Wang

Gao

Pan³

et al. 2023

JFB

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“…Figure 3 shows the effect of applied stress on the pitting potentials of the specimens heat-treated at 1373 K and 1673 K. The pitting potentials labeled #1 and #2 for the 1373 K-treated specimens with and without stress were cited from previous research 3) and the pitting potential labeled as #3 was the result of additional experiments in this work. In the case of the stainless steel heat-treated at 1373 K (with MnS inclusions), the pitting potentials under the no-stress and stress conditions ranged from 0.52 to 0.56 V and from 0.44 V to 0.50 V, respectively.…”

Section: Effect Of Applied Stress On Pitting Potentialsmentioning

confidence: 95%

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

et al. 2022

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MnS inclusions in Type 304 stainless steel were mainly transformed into oxide/oxysulfide inclusions by heat-treatment at 1673 K. In 0.1 M MgCl 2 under both the no-stress and stress conditions, the pitting potential of the steel heat-treated at 1673 K was higher than the steel heat-treated at 1373 K. The pitting potential of the stainless steel heat-treated at 1673 K did not decrease due to applied stress. For the steel heat-treated at 1673 K, the dissolution current of oxide/oxysulfide inclusions was lower than that at MnS inclusions. The results show no significant decrease in the pitting potential of the steel heat-treated at 1673 K even under applied stress.

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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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The role of applied stress in the anodic dissolution of sulfide inclusions and pit initiation of stainless steels

Cited by 25 publications

References 64 publications

Effect of the Combination of Torsional and Tensile Stress on Corrosion Behaviors of Biodegradable WE43 Alloy in Simulated Body Fluid

Effect of the Combination of Torsional and Tensile Stress on Corrosion Behaviors of Biodegradable WE43 Alloy in Simulated Body Fluid

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

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

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