Electrochemical impedance spectroscopy study of the passive film for laser-beam-melted 17-4PH stainless steel

Barroux, Adrien; Delgado, Julien; Orazem, Mark E.; Tribollet, Bernard; Laffont, Lydia; Blanc, Christine

doi:10.1016/j.corsci.2021.109750

Cited by 21 publications

(9 citation statements)

References 42 publications

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“…In view of the microstructural differences observed between the two MSSs, it was interesting to assess the role of reversed austenite. Thus, combining these results with those presented by Barroux et al [ 32 , 34 ], in particular concerning the lower Cr amount of the passive film above the reversed austenite, the results showed that it was more difficult to initiate stable pits for MSS produced by AM because it contained fewer NbC particles, and the particles were smaller in size. However, once pitting had started, pits extended more rapidly in MSS produced by AM, particularly due to the lower Cr amount in the passive film, which made MSS produced by AM less able to repassivate.…”

Section: Resultssupporting

confidence: 78%

“…The E pit values were more positive for the AM samples (291 ± 9 mV SCE ) than those for the CM samples (123 ± 11 mV SCE ). This could be explained by referring to the distribution of NbC carbides (fewer and finer for the AM samples as compared with the CM samples), which constitute preferential sites for pit initiation [ 32 , 34 ]. Therefore, the results showed that MSS produced by AM had better resistance to pit initiation than MSS obtained by CM, in agreement with Barroux’s work [ 32 , 34 ].…”

Section: Resultsmentioning

confidence: 99%

“…This could be explained by referring to the distribution of NbC carbides (fewer and finer for the AM samples as compared with the CM samples), which constitute preferential sites for pit initiation [ 32 , 34 ]. Therefore, the results showed that MSS produced by AM had better resistance to pit initiation than MSS obtained by CM, in agreement with Barroux’s work [ 32 , 34 ]. Furthermore, current transients characteristic of metastable pits were observed for both MSSs; they were more numerous, but with a lower intensity, for the CM samples of MSS as compared with the AM samples of MSS.…”

Section: Resultsmentioning

confidence: 99%

“…The results obtained here were in perfect agreement with those obtained by Barroux et al who also highlighted the greater susceptibility of AM samples to the formation of metastable pits as compared with CM samples [ 32 ]. The authors used XPS to analyse the chemical composition and thickness of the passive film formed on AM and CM samples of MSS [ 34 ]; they showed that the passive film was less rich in Cr for the AM samples than for the CM samples due to the higher content of reversed austenite in the AM sample, the austenite containing less Cr than the martensite. These conclusions were in good agreement with the work of Långberg et al who compared the composition of the passive film above ferrite and martensite in a duplex SS [ 48 ].…”

Section: Resultsmentioning

confidence: 99%

“…Barroux et al worked on the same samples and confirmed that the pores and Si-rich oxide inclusions did not affect the pitting corrosion behaviour, whereas they showed that the austenite to martensite ratio was a first-order parameter in the pitting corrosion behaviour of 17-4PH MSS [ 32 ], in agreement with Tavakoli Shoushtari’s work [ 33 ]. This could be, at least partially, explained by referring to the influence of this ratio on the passive film properties [ 34 ].…”

Section: Introductionmentioning

confidence: 99%

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Susceptibility to Pitting and Environmentally Assisted Cracking of 17-4PH Martensitic Stainless Steel Produced by Laser Beam Melting

et al. 2022

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Materials produced by additive manufacturing (AM) often have different microstructures from those obtained using conventional metallurgy (CM), which can have significant impacts on the materials’ durability, and in particular, resistance to corrosion. In this study, we were concerned with the susceptibility to pitting and environmentally assisted cracking (EAC) of 17-4PH martensitic stainless steel (MSS). We focused on the evolution from pitting to EAC, and the behaviour of MSS produced by AM was compared with that of its CM counterpart. Potentiodynamic polarisation tests were combined with chronoamperometry measurements performed without and with mechanical loading to study both stable and metastable pitting and the influence of stress on these processes. EAC tests were carried out and combined with observations of fracture surfaces. MSS produced by AM was more resistant to pit initiation due to fewer and finer NbC particles. However, the propagation kinetics of stable pits were higher for this MSS due to a higher amount of reversed austenite. The stress was found to stabilise the metastable pits and to accelerate the propagation of stable pits, which resulted in an increased susceptibility to EAC of the MSS produced by AM. These results clearly highlighted the fact that the reversed austenite amount has to be perfectly controlled in AM processes.

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Section: Resultssupporting

confidence: 78%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Susceptibility to Pitting and Environmentally Assisted Cracking of 17-4PH Martensitic Stainless Steel Produced by Laser Beam Melting

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Mechanism of surface corrosion resistance of 304 stainless steel processed by nanosecond laser pulses

Yang

Wang

Xiong

et al. 2022

Materials & Corrosion

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A nanosecond pulsed fiber laser was used to modify the surface of 304 stainless steel. The compactness, microstructure, chemical composition, and corrosion resistance of the stainless steel passive film were observed by the blue dot detection method, scanning electron microscopy, x-ray photoelectron spectroscopy, and electrochemical methods. The influence of different laser fluences on the stability and corrosion resistance of the stainless steel passive film was studied. The results show that with increasing laser fluence, the discoloration reaction time of the stainless steel surface increases first and then decreases, while the surface roughness decreases first and then increases.

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Insight into the pitting corrosion behavior of laser‐welded R60702 zirconium alloy in chloride electrolyte

Ren,

Wang,

et al. 2024

Materials & Corrosion

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This work aims to analyze the passivation and pitting corrosion behaviors of laser beam welded R60702 zirconium alloy in neutral and acidic chloride‐containing electrolytes. Potentiodynamic polarization and electrochemical impedance spectroscopy measurements are carried out to investigate the electrochemical performance of the welding joint. Scanning electron microscope, X‐ray diffraction, and three‐dimensional profile digital microscope are utilized to reveal the microstructures and corrosion morphologies. The electrochemical results show that the heat‐affected zone (HAZ) and weld zone have nearly equal corrosion performance, and both of them are more corrosion‐resistant than the base metal. The corrosion morphologies suggest that the HAZ has the lowest sensitivity to pitting corrosion. Moreover, it is unraveled that, in chloride‐containing electrolytes, the quantity and distribution of Zr(Fe,Cr)2 particle phases are the main factors that determine the different corrosion performances of the welding joint.

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Electrochemical impedance spectroscopy study of the passive film for laser-beam-melted 17-4PH stainless steel

Cited by 21 publications

References 42 publications

Susceptibility to Pitting and Environmentally Assisted Cracking of 17-4PH Martensitic Stainless Steel Produced by Laser Beam Melting

Susceptibility to Pitting and Environmentally Assisted Cracking of 17-4PH Martensitic Stainless Steel Produced by Laser Beam Melting

Mechanism of surface corrosion resistance of 304 stainless steel processed by nanosecond laser pulses

Insight into the pitting corrosion behavior of laser‐welded R60702 zirconium alloy in chloride electrolyte

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