Effect of the roughness produced by plasma nitrocarburizing on corrosion resistance of AISI 304 austenitic stainless steel

Cisquini, P.; Ramos, Simão Vervloet; Viana, Pedro Rupf Pereira; Lins, Vanessa de Freitas Cunha; Franco, A.; Vieira, Estéfano Aparecido

doi:10.1016/j.jmrt.2019.01.006

Cited by 37 publications

(19 citation statements)

References 31 publications

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“…[24] found that the Volta potential at valleys on the metal surface was more positive than that of peaks, indicating peaks were dissolved preferentially when corrosion occurred. Further, the potential difference (PD) of the adjacent valley and peak increases with the height difference, resulting in the enhancement of corrosion susceptibility of carbon steel, which coincided with previous studies [25,26].…”

Section: Introductionsupporting

confidence: 88%

Determinant parameters of surface morphology to corrosion behaviour of cold-rolled auto sheet steel

et al. 2021

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To elucidate the effect of surface morphology on corrosion behaviour of coldrolled steel, three-dimensional (3D) surface profiles, average corrosion rate and potential differences (PD) for local areas of cold-rolled steel were investigated using a 3D white-light interference surface profilometer, polarization curves and atomic force microscope. Results showed that the linear relationship between surface roughness Sa and corrosion rate, achieved based on polished steels, was not valid for the as-received interstitial-free steels. An innovative surface parameter, the proportion of active area (Pa), was proposed and verified to have a distinct positive correlation with the corrosion rate of as-received cold-rolled steels. Moreover, it was found that the specimen with different surface textures were involved in diverse corrosion stages, and thus, the corrosion rate was determined by different surface parameters. As a result, a three-stage corrosion evolution, including initial dissolution (stage I), peak levelling (stage II) and general thinning (stage III), was deduced, in which Pa and local PD played predominant roles to stage I and stage II, respectively.

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Section: Introductionsupporting

confidence: 88%

Determinant parameters of surface morphology to corrosion behaviour of cold-rolled auto sheet steel

et al. 2021

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“…Superaustenitic steels produce values of resistance to pitting corrosion that clearly exceed those of commonly used austenitic steels, which are not stabilised by nitrogen [ 5 ]. Similar or even better corrosion resistance results can be obtained by the application of low-temperature nitriding (<450 °C) [ 7 , 8 , 9 , 10 , 11 , 12 ], carburising (<500 °C) [ 13 , 14 , 15 ] or nitrocarburising (<450 °C) [ 16 , 17 , 18 , 19 ] of austenitic steels that do not contain significant additions of nitrogen in their structure, such as, for example, AISI 304L, AISI 316L or AISI 321 steel. In these processes, the face centred cubic structure (fcc), which is present in the steel’s surface layer, shows a certain degree of deformability, which is dependent on the concentration of nitrogen and/or carbon [ 17 , 20 ].…”

Section: Introductionmentioning

confidence: 76%

“…The achieved E pit potential values are all the more surprising in view of the fact that the tests were conducted in a 0.5 M NaCl solution with a concentration of Cl − ions similar to that which is found in natural seawater. Cisquini et al [ 19 ] investigated the influence of the roughness induced by sputtering during plasma nitrocarburising and of process temperature on the corrosion resistance of AISI 304 austenitic stainless steel in a 3.5% aqueous solution of sodium chloride. For example, a specimen nitrocarburised at 430 °C with a layer thickness of 12.9 µm and surface roughness of 0.71 µm showed a pitting potential of approx.…”

Section: Resultsmentioning

confidence: 99%

Enhancing the Corrosion Resistance of Austenitic Steel Using Active Screen Plasma Nitriding and Nitrocarburising

Borowski

2021

Materials

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AISI 316L steel was subjected to active screen plasma nitriding and nitrocarburising. The processes were carried out at 440 °C for 6 h. The nitriding process employed an atmosphere of nitrogen and hydrogen, while nitrocarburising was carried out in nitrogen, hydrogen and methane. The processes yielded structures consisting of nitrogen and nitro-carbon expanded austenite, respectively. Microhardness was measured via the Vickers method, surface roughness using an optical profilometer, microstructure by means of light microscopy, while a scanning electron microscope (SEM) served to determine surface topography. Phase composition, lattice parameter and lattice deformation tests were carried out using the X-ray diffraction (XRD) method. Corrosion resistance measurements were performed in a 0.5 M NaCl solution using the potentiodynamic method. The produced layers showed very high resistance to pitting corrosion, while the pitting potential reached 1.5 V, a value that has not yet been recorded in a chloride environment. After the passive layer was broken down, there was a clear deceleration of pitting in the nitrocarburised layer. It was found that in the case of nitro-carbon expanded austenite, pits are formed much slower compared to the nitrogen austenite layer.

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“…The chemical-heat treatment of cutting tools includes the diffusion saturation technology applied to the surface layer for elements C, N, B. In this case, cementation, nitriding [18], nitrocarburizing [19], and boriding [20] were used. Notably, the choice of a proper chemical-thermal treatment method depends on the tool surface layer requirements and heat resistance of the tool's material.…”

Section: Introductionmentioning

confidence: 99%

Impact of Magnetic-Pulse and Chemical-Thermal Treatment on Alloyed Steels’ Surface Layer

et al. 2022

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The relevant problem is searching for up-to-date methods to improve tools and machine parts’ performance due to the hardening of surface layers. This article shows that, after the magnetic-pulse treatment of bearing steel Cr15, its surface microhardness was increased by 40–50% compared to baseline. In this case, the depth of the hardened layer was 0.08–0.1 mm. The magnetic-pulse processing of hard alloys reduces the coefficient of microhardness variation from 0.13 to 0.06. A decrease in the coefficient of variation of wear resistance from 0.48 to 0.27 indicates the increased stability of physical and mechanical properties. The nitriding of alloy steels was accelerated 10-fold that of traditional gas upon receipt of the hardened layer depth of 0.3–0.5 mm. As a result, the surface hardness was increased to 12.7 GPa. Boriding in the nano-dispersed powder was accelerated 2–3-fold compared to existing technologies while ensuring surface hardness up to 21–23 GPa with a boride layer thickness of up to 0.073 mm. Experimental data showed that the cutting tool equipped with inserts from WC92Co8 and WC79TiC15 has a resistance relative to the untreated WC92Co8 higher by 183% and WC85TiC6Co9—than 200%. Depending on alloy steel, nitriding allowed us to raise wear resistance by 120–177%, boriding—by 180–340%, and magneto-pulse treatment—by more than 183–200%.

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Effect of the roughness produced by plasma nitrocarburizing on corrosion resistance of AISI 304 austenitic stainless steel

Cited by 37 publications

References 31 publications

Determinant parameters of surface morphology to corrosion behaviour of cold-rolled auto sheet steel

Determinant parameters of surface morphology to corrosion behaviour of cold-rolled auto sheet steel

Enhancing the Corrosion Resistance of Austenitic Steel Using Active Screen Plasma Nitriding and Nitrocarburising

Impact of Magnetic-Pulse and Chemical-Thermal Treatment on Alloyed Steels’ Surface Layer

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