Hemocompatibility of plasma nitrided 316L stainless steel: Effect of processing temperature

Galeano-Osorio, D.S.; Vargas, Santiago; Vélez, Juan Manuel; Mello, Alexandre; Tanaka, M; Castano, Carlos E.

doi:10.1016/j.apsusc.2019.144704

Cited by 10 publications

(13 citation statements)

References 51 publications

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“…The obtained results were not univocal, and the contact angle of water drops on nitrided specimens was reported to decrease [42][43][44]46,47] or increase [41,45,47,48], in comparison with that for untreated samples. The changes of wetting behavior were investigated mainly for biocompatibility applications on samples having a smooth surface finishing before the treatments [42][43][44]46,47]. The studies on the effects of nitriding parameters on surface modification and thus on changes of wettability are few [41,42,44,48], and for the most part [41,42,44] they also do not report the influence of the treatments on the corrosion resistance, which remains of paramount importance for these sample types.…”

Section: Introductionmentioning

confidence: 76%

“…These changes are able to influence the wetting behavior of liquids, but in the international literature this this topic, which should be particularly interesting for extending the possible uses of components subjected to this treatment type, has been neglected, and the studies about the wetting behavior of low-temperature nitrided austenitic stainless steels are few, regarding mainly water wettability [41][42][43][44][45][46][47][48]. The obtained results were not univocal, and the contact angle of water drops on nitrided specimens was reported to decrease [42][43][44]46,47] or increase [41,45,47,48], in comparison with that for untreated samples. The changes of wetting behavior were investigated mainly for biocompatibility applications on samples having a smooth surface finishing before the treatments [42][43][44]46,47].…”

Section: Introductionmentioning

confidence: 99%

“…The changes of wetting behavior were investigated mainly for biocompatibility applications on samples having a smooth surface finishing before the treatments [42][43][44]46,47]. The studies on the effects of nitriding parameters on surface modification and thus on changes of wettability are few [41,42,44,48], and for the most part [41,42,44] they also do not report the influence of the treatments on the corrosion resistance, which remains of paramount importance for these sample types. A lack of information exists also on the influence of the initial surface finishing of the specimens and on the wetting behavior of the modified surfaces by different liquids.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Surface Modification by Means of Low-Temperature Plasma Nitriding on Wetting and Corrosion Behavior of Austenitic Stainless Steel

2020

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Low-temperature nitriding of austenitic stainless steels produces modified surface layers, consisting mainly of the S phase, which improve surface hardness and corrosion resistance. Because of the localized plastic deformations, owing to modified layer formation, and ion bombardment occurring during the process itself, this treatment produces also modifications of surface morphology and roughness, which can affect wettability and corrosion behavior. In this study the effects of plasma nitriding, performed using different treatment conditions, on the surface morphology and roughness, and thus on wettability and corrosion resistance, of AISI 202 specimens with different initial finishings (2D and polished finishing) were investigated. Different probe liquids, having both high (bi-distilled water and solution of 3.5% NaCl) and low (ethanol and rapeseed oil) surface tension, were employed for assessing the wetting behavior with the sessile drop method. The contact angle values for water increased markedly when nitriding was performed on polished samples, while this increase was smaller for 2D samples, and on selected specimens a hydrophobic behavior was observed. Very low contact angle values were registered using low surface tension liquids, suggesting an oleophilic behavior. Corrosion resistance in a 5% NaCl solution was assessed, and it depended on the characteristics of the nitrided specimens.

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Section: Introductionmentioning

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of Surface Modification by Means of Low-Temperature Plasma Nitriding on Wetting and Corrosion Behavior of Austenitic Stainless Steel

2020

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“…Using the theoretical analysis developed by Warren [176], the shift of the peaks from their fcc position allows to calculate the lattice parameter and the fault probability α. Fault probability in the range 0.09-0.25 has been obtained [62,159,167,177], which corresponds to a faulted plane every about 8 or 4 unfaulted planes, respectively. The Warren's theory hypothesizes a small value of α and it does not consider the finite size of crystallites or the presence of twin faults.…”

Section: Crystallographic Structure Of the S Phasementioning

confidence: 99%

From Austenitic Stainless Steel to Expanded Austenite-S Phase: Formation, Characteristics and Properties of an Elusive Metastable Phase

Borgioli

2020

Metals

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Austenitic stainless steels are employed in many industrial fields, due to their excellent corrosion resistance, easy formability and weldability. However, their low hardness, poor tribological properties and the possibility of localized corrosion in specific environments may limit their use. Conventional thermochemical surface treatments, such as nitriding or carburizing, are able to enhance surface hardness, but at the expense of corrosion resistance, owing to the formation of chromium-containing precipitates. An effective alternative is the so called low temperature treatments, which are performed with nitrogen- and/or carbon-containing media at temperatures, at which chromium mobility is low and the formation of precipitates is hindered. As a consequence, interstitial atoms are retained in solid solution in austenite, and a metastable supersaturated phase forms, named expanded austenite or S phase. Since the first studies, dating 1980s, the S phase has demonstrated to have high hardness and good corrosion resistance, but also other interesting properties and an elusive structure. In this review the main studies on the formation and characteristics of S phase are summarized and the results of the more recent research are also discussed. Together with mechanical, fatigue, tribological and corrosion resistance properties of this phase, electric and magnetic properties, wettability and biocompatibility are overviewed.

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“…Implant hemocompatibility is a complex issue that determines its usability in the human body [ 1 , 2 , 3 ]. These are broad terms that include many factors, including mechanical, physical, chemical, and electrochemical properties, both of the biomaterial itself and the finished implant [ 4 , 5 , 6 ]. Another essential factor that impacts hemocompatibility is surface preparation [ 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Selected Physicochemical Properties of Diamond Like Carbon (DLC) Coating on Ti-13Nb-13Zr Alloy Used for Blood Contacting Implants

et al. 2020

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Despite high interest in the issues of hemocompatibility of titanium implants, particularly those made of the Ti-13Nb-13Zr alloy, the applied methods of surface modification still do not always guarantee the physicochemical properties required for their safe operation. The factors that reduce the efficiency of the application of titanium alloys in the treatment of conditions of the cardiovascular system include blood coagulation and fibrous proliferation within the vessel’s internal walls. They result from their surfaces’ physicochemical properties not being fully adapted to the specifics of the circulatory system. Until now, the generation and development mechanics of these adverse processes are not fully known. Thus, the fundamental problem in this work is to determine the correlation between the physicochemical properties of the diamond like carbon (DLC) coating (shaped by the technological conditions of the process) applied onto the Ti-13Nb-13Zr alloy designed for contact with blood and its hemocompatibility. In the paper, microscopic metallographic, surface roughness, wettability, free surface energy, hardness, coating adhesion to the substrate, impendence, and potentiodynamic studies in artificial plasma were carried out. The surface layer with the DLC coating ensures the required surface roughness and hydrophobic character and sufficient pitting corrosion resistance in artificial plasma. On the other hand, the proposed CrN interlayer results in better adhesion of the coating to the Ti-13Nb-13Zr alloy. This type of coating is an alternative to the modification of titanium alloy surfaces using various elements to improve the blood environment’s hemocompatibility.

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Hemocompatibility of plasma nitrided 316L stainless steel: Effect of processing temperature

Cited by 10 publications

References 51 publications

Effects of Surface Modification by Means of Low-Temperature Plasma Nitriding on Wetting and Corrosion Behavior of Austenitic Stainless Steel

Effects of Surface Modification by Means of Low-Temperature Plasma Nitriding on Wetting and Corrosion Behavior of Austenitic Stainless Steel

From Austenitic Stainless Steel to Expanded Austenite-S Phase: Formation, Characteristics and Properties of an Elusive Metastable Phase

Selected Physicochemical Properties of Diamond Like Carbon (DLC) Coating on Ti-13Nb-13Zr Alloy Used for Blood Contacting Implants

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