Role of nitrogen on the corrosion behavior of austenitic stainless steels

Baba, Hajime; Kodama, Toshiaki; Katada, Yasuyuki

doi:10.1016/s0010-938x(02)00040-9

Cited by 283 publications

(182 citation statements)

References 25 publications

Supporting

Mentioning

168

Contrasting

Unclassified

Order By: Relevance

“…z E-mail: CHIBA.Aya@nims.go.jp It has been reported that the generation of hydroxide ions (OH − ) as a by-product of the dissolution of interstitial nitrogen in the exposed environment (alkalization) is one of mechanisms contributing to the improved localized corrosion resistance of austenitic stainless steels with interstitial nitrogen. 25,30 The enhanced corrosion resistance of carbon steel with interstitial nitrogen was demonstrated in our previous work.…”

mentioning

confidence: 68%

“…[23][24][25][26][27][28][29] * Electrochemical Society Member. z E-mail: CHIBA.Aya@nims.go.jp It has been reported that the generation of hydroxide ions (OH − ) as a by-product of the dissolution of interstitial nitrogen in the exposed environment (alkalization) is one of mechanisms contributing to the improved localized corrosion resistance of austenitic stainless steels with interstitial nitrogen.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Interstitial Carbon Enhanced Corrosion Resistance of Fe-33Mn-xC Austenitic Steels: Inhibition of Anodic Dissolution

Chiba

Koyama

Akiyama

et al. 2018

J. Electrochem. Soc.

View full text Add to dashboard Cite

Five Fe-33Mn-xC steels, referred to as 0 C, 0.3 C, 0.6 C, 0.8 C, and 1.1 C steels according to their carbon content in mass%, were prepared to clarify the effect of interstitial carbon on the dissolution behavior of steel. The 0.3 C, 0.6 C, 0.8 C, and 1.1 C steels indicated a fully austenitic structure with no carbide precipitate. The lattice parameters of the 0.6 C, 0.8 C, and 1.1 C steels calculated from the γ(111) and γ(200) diffraction peaks increased by up to around 0.8% over that of the 0.3 C steel, suggesting that the added carbon was present as interstitial carbon in the steels. The 0.6 C, 0.8 C, and 1.1 C steels were passivated during the anodic polarization measurements in 0.1 M Na 2 SO 4 solution at pH 12.0, whereas the 0 C and 0.3 C steels actively dissolved. The anodic polarization measurements in a buffer solution at pH 10.0 demonstrated a lower dissolution current density for the 0.3 C, 0.6 C, 0.8 C, and 1.1 C steels with higher amounts of interstitial carbon. The dissolution current density at 0.3 V vs. Ag/AgCl (3.33 M KCl) of the 1.1 C steel was reduced to approximately 1 × 10 −2 A m −2 , which was one hundredth that of the 0.3 C steel. The dissolution current density of the steels was not inhibited by the presence of 0.1 M CO 3 2− ions, which is an expected dissolution product of interstitial carbon, implying that the interstitial carbon improved the electrochemical property of the steels themselves. The work function of the 1.1 C steel, which showed improved corrosion resistance with interstitial carbon, was 0.12 eV lower than that of the 0 C steel. Interstitial carbon has been reported to successfully improve the corrosion resistance of austenitic stainless steels. Low-temperature carburizing treatments have been typically applied to introduce a substantial amount of interstitial carbon at the surface region of austenitic stainless steels to form a carbide precipitation free carbon super saturated solid solution layer. [1][2][3][4][5][6][7][8][9] The carburizing treatments are known to dramatically improve the pitting corrosion resistance of austenitic stainless steels in chloride-containing environments. Anodic polarization measurements of the specimens with an exposed area of around 1 cm 2 indicated an increase in the pitting corrosion potential of the carburized stainless steels with interstitial carbon compared to untreated stainless steels. 1,[3][4][5] The microscopic anodic polarization measurements of the carburized stainless steel with a micro-scale electrode area (around 150 μm × 300 μm) containing an MnS inclusion, which is known to act as an initiation site of the pitting of stainless steels, 10-21 demonstrated that no pitting was initiated on the carburized stainless steel despite the presence of the MnS inclusion.6 The micro-scale electrode areas were in situ observed by an optical microscope with a water immersion objective lens (a lateral resolution of ca. 350 nm)19,22 during the microscopic anodic polarization. The microscopic polarization measurements revealed that the carbur...

show abstract

mentioning

confidence: 68%

mentioning

confidence: 99%

Interstitial Carbon Enhanced Corrosion Resistance of Fe-33Mn-xC Austenitic Steels: Inhibition of Anodic Dissolution

Chiba

Koyama

Akiyama

et al. 2018

J. Electrochem. Soc.

View full text Add to dashboard Cite

show abstract

“…No trabalho de Baba et al [11] alguns mecanismos segundo os quais o nitrogênio melhora o comportamento a corrosão dos aços inoxidáveis são apresentados: a concentração de nitrogênio na camada passiva do metal a torna mais estável pela formação de nitretos e oxi-nitretos e consequentemente previne o ataque de ânions (Cl -); a adição de nitrogênio estabiliza a fase austenítica; e, a adição de nitrogênio aumenta o tamanho da região de passivação através da redução do potencial de passivação e aumento do potencial de pite.…”

Section: Polarização Potenciodinâmicaunclassified

Obtenção de austenita expandida (fase S): Nitretação por plasma em baixa temperatura x SHTPN - Parte 2

Reis

Durante

2015

Matéria (Rio J.)

View full text Add to dashboard Cite

RESUMOCorpos de prova de aço inoxidável austenítico ISO 5832-1 apresentando camada superficial rica em nitrogê-nio (fase S), obtidas pelos processos de nitretação por plasma em baixa temperatura e SHTPN (Solution Heat Treatment after Plasma Nitriding), caracterizadas em trabalho anterior, além de amostras na condição de fornecimento, ou seja, solubilizadas, e amostras nitretadas por plasma em 750 ºC por 3 horas foram testadas quanto à resistência a corrosão. A resistência a corrosão foi avaliada com base no método de polarização potenciodinâmica e obtenção de potencial de circuito aberto (E corr vs tempo) em uma solução de 0,5 M NaCl. Os resultados comprovaram o ganho na resistência a corrosão localizada proveniente do nitrogênio em solução sólida, tanto para nitretação em baixa temperatura quanto no processo SHTPN, bem como o efeito deleté-rio proveniente da precipitação do nitreto de cromo. Palavras-chave:Nitretação por plasma, SHTPN, fase "S", ISO 5832-1, corrosão. ABSTRACTSamples of austenitic stainless steel ISO 5832-1 showing nitrogen-rich surface layer (S-phase), obtained by plasma nitriding at low temperature and SHTPN (Solution Heat Treatment after Plasma Nitriding) processes, characterized in previous work, and samples in starting microstructure, in other words, solubilized and plasma samples nitrided at 750° C for 3 hours, were tested for corrosion resistance. The corrosion resistance was evaluated based on the potentiodynamic anodic polarization test and open circuit measurements of corrosion potential (OCP) using 0.5 M NaCl. The results confirmed the gain in localized corrosion resistance from the nitrogen in solid solution in both low-temperature nitriding and SHTPN process, as well as from the deleterious effect of precipitation of chromium nitride.Keywords: Plasma nitriding, SHTPN, S-phase, ISO 5832-1, corrosion. INTRODUÇÃOOs aços inoxidáveis austeníticos são vastamente empregados na indústria por possuírem excelente resistência à corrosão; entretanto, dependendo do meio ao qual estão expostos, podem sofrer corrosão por pite e / ou frestas. Este fato, aliado a baixa dureza e propriedades tribológicas, limita sua aplicabilidade. Várias técnicas vêm sendo empregadas com o objetivo de melhorar as características superficiais destes aços por meio da adição de nitrogênio em solução sólida [1][2][3][4][5][6][7].A adição de nitrogênio aos aços inoxidáveis austeniticos traz melhoras expressivas em propriedades tais como a resistência a corrosão por pite, corrosão sob tensão e fadiga [8].Nos aços inoxidáveis austeniticos o nitrogênio melhora a resistência à corrosão intergranular, pois retarda a precipitação de fases intermetálicas, além do que, a precipitação de nitretos traz uma perda menor no teor de cromo da matriz que na precipitação de carbonetos [8]. A resistência à corrosão localizada e ainda Autor Responsável: Ricardo Fernando dos Reis Data de envio:

show abstract

“…Figure 13 shows similar results for 0.9N-0Mo steel and 0.9N-1Mo steel. For 0.7N-1Mo steel and 0.8N-0Mo steel, after potentiostatic crevice corrosion tests of 0.2 V (SCE), the ratio of the nitrogen content eluted into the solution calculated from weight loss measurements and the nitrogen content calculated from stoichiometric NH 4 þ value is almost 1, indicating that almost all the nitrogen in the solution is present as NH 4 þ . There are several reports regarding nitrogen compounds formed by nitrogen dissolved into the bulk solution after being solidified in the steel by the effect of localized corrosion.…”

Section: Xps Surface Analysis Of Passivation Film and Crevice Corrosimentioning

confidence: 99%

“…[1][2][3][4][5][6] Compared to other additives such as chromium or molybdenum, a minute nitrogen content is effective in improving resistance to localized corrosion. Moreover, nitrogen addition helps to refine the microstructure and increase the strength of the material, and it can be used instead of nickel as an austeniteforming element.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nitrogen on Crevice Corrosion and Repassivation Behavior of Austenitic Stainless Steel

Baba

Katada

2008

Mater. Trans.

View full text Add to dashboard Cite

Austenitic stainless steels were produced based on a Fe-23 mass%Cr-4 mass%Ni alloy with varying nitrogen (0.7-1 mass%) and molybdenum contents (0-1 mass%), through electro-slag remelting (ESR) under high nitrogen gas pressure. The effects of nitrogen on crevice corrosion behavior in an acidic chloride solution were investigated, and the passive film of the crevice corrosion area after corrosion tests was analyzed using X-ray photoelectron spectroscopy (XPS). At the same time, the effects of nitrogen on the passivation behaviors after scratching were also investigated. During crevice corrosion at a noble potential of 0.7 V (SCE), the nitrogen in solid solution in the steel dissolves into the solution as NO 3 À , and its concentration increases with the nitrogen content in the steel. It was also established that the number of corrosion spots, the corrosion loss, and the maximum depth of corrosion all decrease with the increase in the nitrogen content present in the steel and the applied potential. Such results can be attributed to the presence of NO 3 À dissolved into the aqueous solution. On the other hand, results from scratch tests show that the increase in the amount of added nitrogen decreases the peak value of passivation current as well as the amount of electricity during repassivation, suggesting that nitrogen stimulates the passivation process and suppresses the occurrence of crevice corrosion. XPS analysis shows the presence of nitrogen as nitrides and NH 3 in the surface layer of crevice corrosion and the internal layer of passivation films.

show abstract

Role of nitrogen on the corrosion behavior of austenitic stainless steels

Cited by 283 publications

References 25 publications

Interstitial Carbon Enhanced Corrosion Resistance of Fe-33Mn-xC Austenitic Steels: Inhibition of Anodic Dissolution

Interstitial Carbon Enhanced Corrosion Resistance of Fe-33Mn-xC Austenitic Steels: Inhibition of Anodic Dissolution

Obtenção de austenita expandida (fase S): Nitretação por plasma em baixa temperatura x SHTPN - Parte 2

Effect of Nitrogen on Crevice Corrosion and Repassivation Behavior of Austenitic Stainless Steel

Contact Info

Product

Resources

About