Wear and Corrosion Resistances of Active Screen Plasma-Nitrided Duplex Stainless Steels

Pintaúde, Giuseppe; Rovani, Ane C.; Neves, Julio Cesar Klein das; Lagoeiro, Leonardo Evangelista; Li, Xiaoying; Dong, Hanshan

doi:10.1007/s11665-019-04114-y

Cited by 21 publications

(12 citation statements)

References 19 publications

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“…However, according to the literature, current densities of the order of nA/cm 2 to tens of mA/cm 2 are considered passivation densities (Ref 32). Previous works on nitrided DSS (UNS S31803 and UNS S32205) obtained nobler or equal corrosion potentials for nitrided steel compared to the untreated material ( Ref 2,4,6,14). These studies reported passivation current densities of the untreated material in the order of magnitude of 10 0 to 10 1 lA/ cm 2 , while the average current density of nitrided samples can be in the same order of magnitude and larger up to two orders.…”

Section: Resultsmentioning

confidence: 84%

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Effect of Low-Temperature Plasma Nitriding on Corrosion and Surface Properties of Duplex Stainless Steel UNS S32205

Rosa

Calabokis

Borges

et al. 2020

J. of Materi Eng and Perform

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The duplex stainless steel UNS S32205 was plasma nitrided at 380°C for 10 h using a gas mixture of 25% N 2 -75% H 2 . The thickness of the nitrided layer was 4.5 ± 0.5 lm, composed mainly of nitrogen-expanded austenite and iron nitrides precipitates. There was an increase in surface hardness around 2.6 and 3.8 times in the nitrided layer formed on the austenite and the ferrite phases, respectively, in relation to the untreated samples. The surface texture parameters skewness (S sk ), maximum peak height (S p ) and texture aspect ratio (S tr ) were the most appropriate parameters for studying the topography changes after treatment. An improvement in the localized corrosion properties after the nitriding treatment was revealed by the cyclic polarization curves. The nitrided samples showed higher pitting corrosion and repassivation potentials compared to the untreated material. The ferritic phases and grain boundaries were more susceptible to corrosion in the nitrided samples. The potentiodynamic curves of the nitrided samples exhibited a hillside on the passive-to-transpassive transition. This feature was already observed by other researchers, but it has not been well investigated. Potentiostatic studies demonstrated that metastable pitting took place on this transition.

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Section: Resultsmentioning

confidence: 84%

“…Low-temperature plasma nitriding studies on DSS report a non-uniform distribution of nitrogen in the nitrided layer, with differences between phases ( Ref 2,4,6,9). According to the Pitting Resistant Equivalent Number (PREN), the pitting corrosion resistance depends mainly on the chromium, molybdenum and nitrogen elements (Ref 19,33).…”

Section: Resultsmentioning

confidence: 99%

Effect of Low-Temperature Plasma Nitriding on Corrosion and Surface Properties of Duplex Stainless Steel UNS S32205

Rosa

Calabokis

Borges

et al. 2020

J. of Materi Eng and Perform

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“…The abrasion behavior of duplex stainless steels has been studied separately from their corrosion resistances (Marques et al, 2011;Pereira Neto et al, 2016;Pintaude et al, 2019). Marques et al (2011) studied the micro-abrasion and corrosion behaviors of super duplex UNS S32750 steel.…”

Section: Introductionmentioning

confidence: 99%

“…Within the range of nitriding temperatures (350-570°C), they found that 400°C can be allied with wear and corrosion resistances. Pintaude et al (2019) studied the effect of low-temperature plasma nitriding (380°C) on the scratch resistance and corrosion of two grades of duplex stainless steel (SAF 2205 andSAF 2507). The higher support given by the hardness of SAF 2507 steel was determinant for achieving a larger critical load in the scratch test for a thin layer composed by expanded austenite, formed due to plasma nitriding.…”

Section: Introductionmentioning

confidence: 99%

The effect of plasma nitriding on the synergism between wear and corrosion of SAF 2205 duplex stainless steel

Rosa

Mafra

Morales

et al. 2020

ILT

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Purpose This study aims to assess the performance of SAF 2205 duplex stainless steel against pure wear, tribo-corrosion, corrosion and the synergism between wear and corrosion. The effect of plasma nitriding conducted at low temperature (380°C) on SAF 2205 steel was analyzed. Design/methodology/approach Three systems were used for assessing the synergism between wear and corrosion: tribo-corrosion – wear tests conducted using the micro-scale abrasion test, performed under a slurry of alumina particles containing 3.5% NaCl; pure wear – tests conducted using the previous system but isolated in a glovebox with a 99% N2 atmosphere; and cyclic polarization under 3.5% NaCl solution. A hard nitrided layer of 3 µm thickness was characterized using X-ray diffraction, presenting expanded austenite. Findings The wear mode after micro-scale abrasion tests changed in the absence of an oxygen atmosphere. During pure wear, a mixed mode was identified (rolling + grooving), with the grooving mode more intense for the untreated steel. For tribo-corrosion tests, only rolling wear was identified. For all cases, the nitrided samples presented less wear. The corrosion results indicated a higher repassivation potential for the nitrided condition. Practical implications The synergism was more positive for the nitrided sample than for the untreated one, which can be considered for surface treatments of duplex stainless steels in practical applications. Originality/value A detailed description of wear mechanisms showed a significant change in the presence of oxygen atmosphere, a new approach for isolating pure wear.

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“…SAF 2507 SDSS, as one of the latest generation of stainless steels, with better mechanical strength and corrosion resistance, is received extensive attention in marine industries (Wang et al, 2019a(Wang et al, , 2019b(Wang et al, , 2019c(Wang et al, , 2019dHan et al, 2016). When using in sea water environment, the sliding wear and corrosion of SAF 2507 SDSS have been concerned (Pintaude et al, 2019;Tan et al, 2009;Ezuber et al, 2007). Nevertheless, fretting generally exists in engineering applications where contact surfaces are moving to each other with a small amplitude (Li et al, 2018;Zhu and Zhou, 2011).…”

Section: Introductionmentioning

confidence: 99%

Effect of load on the fretting behavior of SAF 2507 super duplex stainless steel in air and sea water

Wang

Líu

Yan

2019

ILT

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Purpose This paper aims to study the influence of load and environment medium on the fretting behavior of SAF 2507 SDSS. Design/methodology/approach In this study, the effect of load on the fretting behavior of SAF 2507 SDSS in air and sea water were studied. The fretting wear tests under different loads were conducted with a ball-on-flat contact configuration. The friction coefficient, wear volume, surface morphology and oxidation component were determined. Findings With the increase of applied load, the friction coefficient decreases both in air and sea water. The fretting mechanism is gradually transformed from partial slip regime to slip regime in air while the fretting counterparts are all in the state of gross slip in sea water. In sea water, the friction coefficient is lower while the wear loss is higher compared with that in air. Research limitations/implications This research suggests that the fretting behavior of SAF 2507 SDSS is related to load and environment medium. Practical implications The results may help us to choose the appropriate load under different environments. Originality/value The main originality of the research is to reveal the fretting behavior of SAF 2507 SDSS under different loads in air and sea water, which would help us to realize fretting behavior of SAF 2507 SDSS is controlled by the combination of applied load and lubricating environment. Peer review The peer review history for this article is available at: http://dx.doi.org/10.1108/ILT-08-2019-0335.

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Wear and Corrosion Resistances of Active Screen Plasma-Nitrided Duplex Stainless Steels

Cited by 21 publications

References 19 publications

Effect of Low-Temperature Plasma Nitriding on Corrosion and Surface Properties of Duplex Stainless Steel UNS S32205

Effect of Low-Temperature Plasma Nitriding on Corrosion and Surface Properties of Duplex Stainless Steel UNS S32205

The effect of plasma nitriding on the synergism between wear and corrosion of SAF 2205 duplex stainless steel

Effect of load on the fretting behavior of SAF 2507 super duplex stainless steel in air and sea water

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