Next Article in Journal
Effects of the Origin and Deacetylation Degree of Chitosan on Properties of Its Coatings on Titanium
Next Article in Special Issue
Palladium Oxide Nanoparticles: Preparation, Characterization and Catalytic Activity Evaluation
Previous Article in Journal
IRI Performance Models for Flexible Pavements in Two-Lane Roads until First Maintenance and/or Rehabilitation Work
Previous Article in Special Issue
Design of [email protected]3O4 Core–Shell Materials and the Fe3O4 Shell Prevents Leaching of Arsenic from Scorodite in Neutral and Alkaline Environments
Article

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

Department of Industrial Engineering, University of Florence, via S. Marta 3, 50139 Florence, Italy
*
Author to whom correspondence should be addressed.
Coatings 2020, 10(2), 98; https://doi.org/10.3390/coatings10020098
Received: 4 December 2019 / Revised: 20 January 2020 / Accepted: 21 January 2020 / Published: 23 January 2020
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. View Full-Text
Keywords: low-temperature nitriding; glow-discharge process; austenitic stainless steels; AISI 202; S phase; wettability; Cassie–Baxter model; Wenzel model; corrosion low-temperature nitriding; glow-discharge process; austenitic stainless steels; AISI 202; S phase; wettability; Cassie–Baxter model; Wenzel model; corrosion
Show Figures

Figure 1

MDPI and ACS Style

Borgioli, F.; Galvanetto, E.; Bacci, T. Effects of Surface Modification by Means of Low-Temperature Plasma Nitriding on Wetting and Corrosion Behavior of Austenitic Stainless Steel. Coatings 2020, 10, 98. https://doi.org/10.3390/coatings10020098

AMA Style

Borgioli F, Galvanetto E, Bacci T. Effects of Surface Modification by Means of Low-Temperature Plasma Nitriding on Wetting and Corrosion Behavior of Austenitic Stainless Steel. Coatings. 2020; 10(2):98. https://doi.org/10.3390/coatings10020098

Chicago/Turabian Style

Borgioli, Francesca, Emanuele Galvanetto, and Tiberio Bacci. 2020. "Effects of Surface Modification by Means of Low-Temperature Plasma Nitriding on Wetting and Corrosion Behavior of Austenitic Stainless Steel" Coatings 10, no. 2: 98. https://doi.org/10.3390/coatings10020098

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop