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

Tan, Xin; Lan, Rulei; Yao, Qiong; Tu, Qiyong; Lei, Longlin; Zhang, Jun; Sun, Yangting; Li, Jin; Jiang, Yiming

doi:10.1002/maco.202213574

Cited by 3 publications

(1 citation statement)

References 33 publications

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“…[1] However, in practical application, local corrosion is a common corrosion mode in 304 SS, originating from the local breakdown of passive film. [2] Chloride, as an important characteristic of environmental factor, has an effect on pitting corrosion of 304 SS. For example, Zhang et al investigated the electrochemical corrosion behavior of 304 SS in chloride ion solutions, and indicated that the stability of 304 SS passive film decreased with the increase of Clion concentration in the solution.…”

Section: Introductionmentioning

confidence: 99%

Study on the passive behavior of 304 stainless steel under temperature variation

Liu,

Sui,

Zhang

et al. 2024

Materials & Corrosion

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In this paper, the passive behavior of 304 stainless steel (SS) in NaCl solution is studied by electrochemical methods and surface analysis. The polarization measurement results show that the pitting potential (Ep) has a simple linear relationship with the temperature increase. Scanning Kelvin probe results show that the surface potential difference on the surface of 304 SS is well correlated with the temperature. Scanning electron microscope results show that the rupture of the passive film accelerates with the increase of temperature. The X‐ray photoelectron spectroscopy analysis shows that the high temperature causes more oxidation on the surface of 304 SS, leading more Cr3+ oxidized to Cr6+ at high temperature.

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Section: Introductionmentioning

confidence: 99%

Study on the passive behavior of 304 stainless steel under temperature variation

Liu,

Sui,

Zhang

et al. 2024

Materials & Corrosion

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Influence of nitrogen content on the pit formation and pit propagation in the welded joints of X5CrNi18‐10 stainless steel

Radojković,

Jegdić,

Pejić

et al. 2023

Materials & Corrosion

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The influence of welding current and nitrogen content in argon shielding gas on the resistance of the welded joint (weld metal and heat‐affected zone [HAZ]) of the stainless steel X5CrNi18‐10 to the formation and growth of pits was investigated. Also, the susceptibility of the welded joint to intergranular corrosion was examined. Pitting corrosion resistance indicators were determined based on anodic potentiodynamic polarization measurements in NaCl + Na2SO4 solution, while susceptibility to intergranular corrosion was determined by the potentiokinetic method with a double loop (DL EPR). SEM/EDS was used to analyze the microstructure. It has been shown that higher nitrogen content in shielding gas leads to an increase in the resistance of welded joints (weld metal and HAZ) to the pit formation. However, an improvement in the resistance to the pit formation leads to a decline in the resistance of the welded joint to pit growth. An explanation of this phenomenon is proposed. Also, it was shown that the increase of the welding current increases the susceptibility of the welded joint to intergranular corrosion, while the higher nitrogen content has no effect.

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Pitting behavior of austenitic stainless-steel welded joints with dense inclusions and methods to enhance pitting resistance

Zhou,

Sun,

Wang

et al. 2024

ACMM

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Purpose This study aims to assess the pitting resistance of austenitic stainless steel welded joints fusion zone (FZ) with high density of inclusions before and after surface treatment, including potentiostatic pulse technique (PPT) and pickling. Design/methodology/approach The potentiodynamic polarization tests and critical pitting temperature tests were carried out for estimating pitting resistance. The PPT and pickling were performed as surface treatment. Scanning electron microscope (SEM) and energy dispersive spectrometer were used for characterize the microstructure and elemental distribution. Electron back-scattered diffraction (EBSD) was used to assess the portion of phases and morphology of grains. Findings The weld metal exhibits a higher degree of alloying compared to the base metal, and it contains d-phase and sulfur-containing inclusions. Sulfur-containing inclusions serve as initiation sites for pitting, and they diminish the pitting resistance of weld metal. Both PPT and pickling can remove sulfur-containing inclusions, but PPT causes localized dissolution of the weld metal matrix around the inclusions, while pickling does not. Because of the high density of inclusions, certain pits initiated by PPT are significantly deeper, which makes the formation of stable pitting easier. Because of the high density of inclusions, certain pits initiated by the PPT are deeper. This characteristic facilitates the progression of these initial defects into fully developed, stable pits. Originality/value Analysis of pitting initiation in shielded metal arc welding FZ with PPT and ex situ SEM tracking observation. Explanation of why the PPT surface treatment is not able to enhance the pitting resistance of stainless steel with a high inclusion density.

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

Cited by 3 publications

References 33 publications

Study on the passive behavior of 304 stainless steel under temperature variation

Study on the passive behavior of 304 stainless steel under temperature variation

Influence of nitrogen content on the pit formation and pit propagation in the welded joints of X5CrNi18‐10 stainless steel

Pitting behavior of austenitic stainless-steel welded joints with dense inclusions and methods to enhance pitting resistance

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