Corrosion behavior of nitride layer obtained on AISI 316L stainless steel via simple direct nitridation route at low temperature

Hamdy, Abdel Salam; Marx, Brian M.; Butt, Darryl P.

doi:10.1016/j.matchemphys.2011.01.037

Cited by 38 publications

(17 citation statements)

References 15 publications

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“…Therefore, low-temperature nitriding and carburizing could be applied to austenitic stainless steel plates used under severe friction conditions. In addition, these treatments restrict the formation of chromium nitride or carbide, maintaining the corrosion resistance [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Wear and Corrosion Properties of Cold-Sprayed AISI 316L Coatings Treated by Combined Plasma Carburizing and Nitriding at Low Temperature

Adachi

Ueda

2018

Coatings

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Cold-sprayed AISI 316L stainless steel coatings are treated to form an austenite phase with excessive dissolved nitrogen (known as the S-phase) by plasma nitriding at temperatures below 450 • C. The S-phase is a hard and wear-resistant layer with high corrosion resistance. However, the S-phase layer formed after only nitriding is thin and the hardness abruptly decreases at a certain depth; it lacks mechanical reliability. We examined two types of combined low-temperature plasma treatment to enhance the mechanical reliability of the S-phase layer: (i) sequential and (ii) simultaneous. In the sequential plasma treatment, the carburizing step was followed by nitriding. In the simultaneous treatment, the nitriding and carburizing steps were conducted at the same time. Both combined plasma treatments succeeded in thickening the S-phase layers and changed the hardness depth profiles to decrease smoothly. In addition, anodic polarization measurements indicated that sequential treatment involving carburizing followed by nitriding for 2 h each resulted in high corrosion resistance.However, plasma-sprayed stainless steel coatings include oxide layers, cracks, and pores in their structure, which deteriorate the corrosion resistance considerably.Cold-spraying is not a fusing process but a solid particle stacking process. Hence, cold-sprayed coatings are without any oxides, similar to a bulk steel structure [23]. It was reported that thick cold-sprayed 316L stainless steel coatings show electrochemical polarization behavior similar to bulk stainless steels [24]. Therefore, it is expected that cold-sprayed AISI 316L coatings can be applied as corrosion protective coatings. Additionally, Villa et al. reported that cold-sprayed 316L coatings can be hardened by cold working during the deposition process, which can also result in increased strength, and the abrasive wear resistance of the coating is in the same order of magnitude as that of coatings produced by HVOF [25]. However, the hardness of the 316L coatings was 358 ± 36 HVN, which is insufficient to apply under severe wear conditions.We have previously reported low-temperature plasma nitriding of cold-sprayed AISI 316L coatings to successfully improve the Vickers hardness to 1200 HV [26]. In particular, remelted AISI 316L coatings by a postlaser treatment had excellent corrosion protection for ordinary steel substrates due to a dense microstructure.However, there is a concern that S-phase layers formed by nitriding without carburizing could be delaminated when an external force is applied, because the hardness of the S-phase layers declines drastically at a certain depth. Low-temperature treatments combining nitriding and carburizing have been reported to result in a milder hardness distribution (with hardness not declining drastically), excellent wear resistance, and thickening of the S-phase layers. There are two types of combined treatments-(i) sequential and (ii) simultaneous. In the sequential treatment, carburizing is followed by nitriding [27][28][29]. Meanwhile, in ...

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Section: Introductionmentioning

confidence: 99%

Wear and Corrosion Properties of Cold-Sprayed AISI 316L Coatings Treated by Combined Plasma Carburizing and Nitriding at Low Temperature

Adachi

Ueda

2018

Coatings

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“…phase (γ N ) with a peak nitrogen concentration up to 35 at.% on the austenitic stainless steel. 1 It was verified that the γ N phase layer on austenitic stainless steel has superior pitting corrosion resistance and equivalent general corrosion resistance in comparison with that of original austenitic stainless steel in NaCl, [2][3][4][5][6][7][8][9][10][11][12][13][14] and Na 2 SO 4 15 and H 2 SO 4 2,6,10,16,17 aqueous solutions. However, a few reports have described the corrosion resistance of the γ N phase layer on austenitic stainless steel in borate solution, 18,19 although different nitrogenmodified austenitic stainless steel has been made in an effort to increase hardness and wear resistance of austenitic stainless steel for use in nuclear power systems.…”

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confidence: 94%

Corrosion and Passivation of High Nitrogen Face-Centered-Cubic Phase Formed on AISI 304L Austenitic Stainless Steel in Borate Buffer Solution

Wang

Song

Lei

2015

J. Electrochem. Soc.

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The corrosion behavior of a high nitrogen face-centered-cubic (f.c.c.) phase (γ N ) formed on plasma-based low-energy nitrogen ion implanted AISI 304L austenitic stainless steel in a borate buffer solution with a pH value of 8.4 was investigated by using anodic polarization, electrochemical impedance spectroscopy, Mott-Schottky analysis and Auger electron spectroscopy/x-ray photoelectron spectroscopy. Compared with original austenitic stainless steel, the γ N phase layer on austenitic stainless steel possessed a significant improvement in corrosion resistance in the borate buffer solution with an apparent decrease of passivation current density and an increase of corrosion potential. A larger electrochemical impedance with a maximal phase angle of the 83 • over low frequency range was obtained for the γ N phase layer. The donor and acceptor densities of the γ N phase layer and the corresponding flat band potential decreased, relative to that of original austenitic stainless steel. The protective passive film on the γ N phase layer was observed as n-type and p-type semiconductors in the potential range above and below the flat band potential, respectively. It was composed of hydroxide/oxides of iron and chromium in the outer region and oxides of chromium and iron in the inner region both accompanied by chromium and iron nitrides, unlike original stainless steel which had pure iron and chromium on outermost surface. The calculated passive film thickness of 2.82 ± 0.67 nm on the γ N phase layer by the power law distribution was compared with the measured thickness of 6.5 nm by AES/XPS. The improvement mechanism of nitrogen atoms in the γ N phase layer on corrosion properties in the borate buffer solution was proposed by means of an applied point defect model.In order to improve combined properties in wear and corrosion resistance of Fe-Cr-Ni austenitic stainless steel, a series of nitrogenmodified processes has been successfully used to form the modified layer composed of a single high nitrogen face-centered-cubic (f.c.c.) phase (γ N ) with a peak nitrogen concentration up to 35 at.% on the austenitic stainless steel. 1 It was verified that the γ N phase layer on austenitic stainless steel has superior pitting corrosion resistance and equivalent general corrosion resistance in comparison with that of original austenitic stainless steel in NaCl, 2-14 and Na 2 SO 4 15 and H 2 SO 4 2,6,10,16,17 aqueous solutions. However, a few reports have described the corrosion resistance of the γ N phase layer on austenitic stainless steel in borate solution, 18,19 although different nitrogenmodified austenitic stainless steel has been made in an effort to increase hardness and wear resistance of austenitic stainless steel for use in nuclear power systems. 20 Moreover, corrosion fatigue cracking in borate solution is one of the typical failure types for Fe-Cr-Ni austenitic stainless steel applied in nuclear power equipment, which is always initiated by destruction and dissolution of the passive film on austenitic stainless steel. 2...

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“…The nitro-oxidation brings the biggest benefit in the field of alloyed steels, e. g. Cr-Mo steels, where nitrides of chromium are formed [9]. Yet the main objective of this paper was to provide a deep analysis of the nitrooxidation influence on low carbon steel sheets.…”

Section: Introductionmentioning

confidence: 99%

Material Characteristics of Low Carbon Steel Sheets Treated by Nitro-Oxidation in Fluid Environment

et al. 2018

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Abstract:The paper deals with a detailed analysis of deep drawing DC 01/DIN EN 10130-9 steel sheets of 1 mm in thickness treated by nitro-oxidation in fluid environment. The nitridation at 580°C/45 min and oxidation at 350°C/5 min was used. The surface Fe3O4 and Fe2O3 oxide layer, as well as the presence of Fe2-3N, γ'-Fe4N nitrides and ferritic matrix, was proved by X-ray diffraction. The Fe2-3N nitrides formed a continuous ε-phase of 7,1 µm in thickness with the microhardness 6,5 times higher than the base material. Corrosion resistance test revealed the highest level according to STN EN ISO 10286/C standard in comparison to the non-treated material. Analysis of mechanical properties showed a significant increase of tensile strength. Ductility decreased approximately by 7,5 %. Erichsen cupping test showed a 15 % decrease of Erichsen cupping index. Fukui deep-drawing test of nitro-oxidised steel exhibited 1,5 % increase of "m" deep-drawing coefficient.

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Corrosion behavior of nitride layer obtained on AISI 316L stainless steel via simple direct nitridation route at low temperature

Cited by 38 publications

References 15 publications

Wear and Corrosion Properties of Cold-Sprayed AISI 316L Coatings Treated by Combined Plasma Carburizing and Nitriding at Low Temperature

Wear and Corrosion Properties of Cold-Sprayed AISI 316L Coatings Treated by Combined Plasma Carburizing and Nitriding at Low Temperature

Corrosion and Passivation of High Nitrogen Face-Centered-Cubic Phase Formed on AISI 304L Austenitic Stainless Steel in Borate Buffer Solution

Material Characteristics of Low Carbon Steel Sheets Treated by Nitro-Oxidation in Fluid Environment

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