Corrosion behavior of ion nitrided AISI 316L stainless steel

Nosei, L.; Farina, S.B.; Ávalos, Martina; Nachez, Lucas; Gómez, B J; Feugeas, J.

doi:10.1016/j.tsf.2007.08.072

Cited by 59 publications

(44 citation statements)

References 22 publications

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“…Hence, materials such as stainless steels [2][3][4] , particularly ASTM F138 and AISI 316L, have been used as alternative materials. The corrosion resistance and hardness of these alloys are inadequate for this application, but if they are submitted to an adequate nitriding process, these properties can be improved [5][6][7][8] . When nitriding is performed at temperatures lower than 450 °C a high nitrogen content expanded austenite phase is formed, which shows higher hardness and higher pitting corrosion resistance compared to the untreated material [7][8][9][10] .…”

Section: Introductionmentioning

confidence: 99%

“…The corrosion resistance and hardness of these alloys are inadequate for this application, but if they are submitted to an adequate nitriding process, these properties can be improved [5][6][7][8] . When nitriding is performed at temperatures lower than 450 °C a high nitrogen content expanded austenite phase is formed, which shows higher hardness and higher pitting corrosion resistance compared to the untreated material [7][8][9][10] . The conditions of the nitriding technique (gas mixture, pressure, time and temperature) play an important role in the characteristic of the modified layer 7,11,12 , as thickness, hardness and N concentration along the layer.…”

Section: Introductionmentioning

confidence: 99%

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Investigating the correlation between some of the properties of plasma nitrided AISI 316L stainless steel

et al. 2013

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When AISI 316L stainless steels are submitted to the nitriding process at temperatures lower than 450 °C, a high nitrogen content expanded austenite phase is formed, which shows higher hardness and higher pitting corrosion resistance compared to the untreated material. As a result, this material becomes adequate for biomedical application. The conditions of the nitriding technique, such as gas mixture, pressure, time and temperature, play an important role in some properties of the modified layer, including: thickness, hardness and N concentration along the layer. This paper explores a set of six samples of AISI 316L, nitrided at different times and temperatures, whose properties show important differences. The aim of this research is to investigate the correlation between the nitrided layer thickness (in the range of 0.77 to 11 µm) with both X-ray patterns characteristics and hardness measurements, which used two distinct loads. The results of this study show that: whereas the 3.6 gf load was suitable to measure the real hardness for four of the nitrided layers showing thickness ≥ 2.9 µm, the 50 gf load measured a substrate contribution, probably even for the highest thickness, 11 µm. Moreover, analyzing different reflections of the X-ray patterns showed evidence of the clear consistency between the X-Ray depths and the nitrided layer thicknesses: if the layer thickness is lower than the penetration depth of X-rays, two phases (austenite and expanded substrate) are present. If the layer thickness is higher, only the austenite is observed. Finally, concerning the citotoxicity property, all the samples, nitrided or not, were approved in the test for biocompatibility, indicating their potential use for biomedical applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigating the correlation between some of the properties of plasma nitrided AISI 316L stainless steel

et al. 2013

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“…According to Fig. 2, the NH 3 dissociation reactions have a rate-determining step (5). Using the DFT calculations, we obtained the energy barrier (E b ) for the NH 3 dissociation.…”

Section: A Dft Calculation Of Elementary Reaction Eventsmentioning

confidence: 99%

“…[1][2][3][4][5][6][7] However, NH 3 gas nitridation is a timeconsuming process. Various research groups have investigated NH 3 nitridation techniques.…”

Section: Introductionmentioning

confidence: 99%

Theoretical study of the ammonia nitridation rate on an Fe (100) surface: A combined density functional theory and kinetic Monte Carlo study

Yeo

et al. 2014

The Journal of Chemical Physics

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Ammonia (NH 3 ) nitridation on an Fe surface was studied by combining density functional theory (DFT) and kinetic Monte Carlo (kMC) calculations. A DFT calculation was performed to obtain the energy barriers (E b ) of the relevant elementary processes. The full mechanism of the exact reaction path was divided into five steps (adsorption, dissociation, surface migration, penetration, and diffusion) on an Fe (100) surface pre-covered with nitrogen. The energy barrier (E b ) depended on the N surface coverage. The DFT results were subsequently employed as a database for the kMC simulations. We then evaluated the NH 3 nitridation rate on the N pre-covered Fe surface. To determine the conditions necessary for a rapid NH 3 nitridation rate, the eight reaction events were considered in the kMC simulations: adsorption, desorption, dissociation, reverse dissociation, surface migration, penetration, reverse penetration, and diffusion. This study provides a real-time-scale simulation of NH 3 nitridation influenced by nitrogen surface coverage that allowed us to theoretically determine a nitrogen coverage (0.56 ML) suitable for rapid NH 3 nitridation. In this way, we were able to reveal the coverage dependence of the nitridation reaction using the combined DFT and kMC simulations.

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“…Normalmente, a indústria de alimentos utiliza o aço inoxidável 304 com polimento 4. 31,32 O teor de molibdênio é a principal diferença na composição do aço inoxidável e é capaz de afetar a natureza da camada de passivação presente na superfície do aço inoxidável. A camada de passivação consiste de uma mistura de óxidos de ferro, cromo e molibdênio e apresenta participação no processo de adesão de bactérias.…”

Section: Formação De Biofilmes: a Natureza Coloidal Do Processo De Adunclassified

Aspectos coloidais da adesão de micro-organismos

Araújo¹,

Andrade²,

Carvalho³

et al. 2010

Quím. Nova

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Recebido em 17/11/09; aceito em 21/4/10; publicado na web em 1/9/10 COLLOIDAL ASPECTS OF BACTERIAL ADHESION. The ability of bacteria to attach to surface and develop into a biofilm has been of considerable interest to food industry. Electrostatic, Lifhistz-van der Waals and Lewis acid-base forces are usually considered responsible for the interactions at the interface of the bacterial adhesion. The study of microbial adhesion thermodynamic is important because it represents the reflection of microbial surface and food processing surface physicochemical characteristics. This review examines the most important aspects involved in bacterial attachment to a surface with emphases in thermodynamics of adhesion process.Keywords: bacterial adhesion; biofilm; microbial surface thermodynamics. INTRODUÇÃOA adesão bacteriana é importante em um grande número de processos tecnológicos, envolvendo desde a microbiologia médica e patológica, passando pela indústria de alimentos e engenharia de meio ambiente até a área de ciência de biomateriais. 1A adesão de micro-organismos a superfícies é um fenômeno que ocorre naturalmente em meios aquosos e depende das propriedades superficiais (tensão superficial, entalpia superficial por unidade de área, composição da superfície, etc.) das interfaces dos suportes de adesão (aço, polímeros, mármore, etc.) e das membranas dos micro-organismos. Além disso, as propriedades microbiológicas e as características do meio circundante, tais como temperatura, pH, força iônica e disponibilidade de nutrientes, determinam, em muitos sistemas, o processo de adsorção. 1 A formação de um biofilme inclui muitas etapas, mas um pré-requisito é a adesão das células microbianas à superfície. Estudos recentes das propriedades de adesão de bactérias têm mostrado que, em alguns casos, as características físico-químicas da superfície da célula contribuem determinantemente no processo de adesão. 2A adesão e a formação de biofilmes microbianos podem ser indesejáveis, sob diversos aspectos, em várias áreas de aplicação. A presença do biofilme em dispositivos médicos implantados já foi descrita em lentes de contato, cateteres venosos centrais, tubos endotraqueais, dispositivos intrauterinos, válvulas cardíacas mecânicas, marcapassos, cateteres de diálise peritoneal, próteses articulares, tubos de timpanostomia, cateteres urinários e de derivação ventrículo-peritoneal.3 Na indús tria de alimentos, a adesão e a formação de biofilme podem tornar o pro cesso de cloração da água menos eficiente; 4 reduzir a eficiência de transferência de energia na forma de calor em trocadores térmicos; diminuir o fluxo em tubulações; desencadear processos corrosivos e, principalmente, se tornarem fon tes de contaminação microbiana.5 Sob o aspecto microbiológico, a adesão pode constituir-se de mi cro-organismos alteradores e/ou patogênicos, que resultam em sérios problemas de higiene, de saúde pública ou de ordem econômica. 6 Por outro lado, em alguns casos, o processo de adesão ou biofilme pode ser desejável, a exemplo daqueles existentes ...

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Corrosion behavior of ion nitrided AISI 316L stainless steel

Cited by 59 publications

References 22 publications

Investigating the correlation between some of the properties of plasma nitrided AISI 316L stainless steel

Investigating the correlation between some of the properties of plasma nitrided AISI 316L stainless steel

Theoretical study of the ammonia nitridation rate on an Fe (100) surface: A combined density functional theory and kinetic Monte Carlo study

Aspectos coloidais da adesão de micro-organismos

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