Corrosion Resistance of Electroless Nickel–Boron Coating in a Bath Exempt from Stabilizer †
1
Service de Métallurgie, Faculté Polytechnique, Université de Mons, Rue de l’Epargne, 56, 7000 Mons, Belgium
2
Arts et Métiers ParisTech, MSMP, Centre de Lille, 59000 Lille, France
*
Authors to whom correspondence should be addressed.
†
Presented at the First Corrosion and Materials Degradation Web Conference, 17–19 May 2021; Available online: https://cmdwc2021.sciforum.net/ .
Mater. Proc. 2021, 6(1), 35; https://doi.org/10.3390/CMDWC2021-10038
Published: 13 May 2021
(This article belongs to the Proceedings of The 1st Corrosion and Materials Degradation Web Conference)
Abstract
:Electroless nickel–boron (ENB) coatings from borohydride-reduced baths have received wide acceptance thanks to their excellent hardness and superior wear resistance. Therefore, they have been considered as an alternative to hard chrome. However, the presence of a small amount of toxic heavy metals such as Pb or Tl in the plating bath restricts their application. These metallic salts are used to stabilize the bath, which is necessary to avoid abrupt decomposition, and are harmful towards the environment. A new bath, exempt from stabilizer, was designed for ENB plating. In this bath, the bath stability is achieved through the optimization of the concentration of complexing agent, pH adjuster, and reducing agent. An ENB coating from the new bath presents promising properties, including modified surface morphology, excellent hardness, low friction coefficient, etc. Salt spray test (ASTM B117-07) and potentiodynamic polarization test results show that the new ENB coating has a significantly better corrosion resistance than the conventional ENB coatings stabilized by Pb or Tl salts. In conclusion, the present ENB coating is produced in an environmentally friendly bath, and the deposit presents properties close to those of the conventional ENB deposit.
Supplementary Materials
The following supporting information can be downloaded at: https://www.mdpi.com/article/10.3390/CMDWC2021-10038/s1, conference presentation file.
Funding
This study was supported by the INTERREG VA program and European Regional Development Fund (FEDER) in the framework of the AltCtrlTrans project.
Institutional Review Board Statement
Not applicable.
Informed Consent Statement
Not applicable.
Acknowledgments
The authors gratefully acknowledge INTERREG for funding. The authors also would like to thank Yoann Paint from Materia Nova for his help with the analysis of the samples by SEM.
Conflicts of Interest
The authors declare no conflict of interest.
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. |
Disclaimer/Publisher’s Note: The statements, opinions and data contained in all publications are solely those of the individual author(s) and contributor(s) and not of MDPI and/or the editor(s). MDPI and/or the editor(s) disclaim responsibility for any injury to people or property resulting from any ideas, methods, instructions or products referred to in the content. |
© 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Share and Cite
MDPI and ACS Style
Yunacti, M.; Megret, A.; Montagne, A.; Vitry, V. Corrosion Resistance of Electroless Nickel–Boron Coating in a Bath Exempt from Stabilizer. Mater. Proc. 2021, 6, 35. https://doi.org/10.3390/CMDWC2021-10038
AMA Style
Yunacti M, Megret A, Montagne A, Vitry V. Corrosion Resistance of Electroless Nickel–Boron Coating in a Bath Exempt from Stabilizer. Materials Proceedings. 2021; 6(1):35. https://doi.org/10.3390/CMDWC2021-10038
Chicago/Turabian StyleYunacti, Muslum, Alexandre Megret, Alex Montagne, and Véronique Vitry. 2021. "Corrosion Resistance of Electroless Nickel–Boron Coating in a Bath Exempt from Stabilizer" Materials Proceedings 6, no. 1: 35. https://doi.org/10.3390/CMDWC2021-10038
