Nanostructured Black Nickel Coating as Replacement for Black Cr(VI) Finish
This work compares different electrodeposition procedures to produce nickel black coatings as greener and less toxic alternatives to Cr(VI)-based coatings used in different applications. Nickel and nickel-plated brass served as substrates in studies with a Hull cell and polarization curves. After a...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-04-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/11/9/3924 |
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| author | Marina M. Mennucci Rodrigo Montes Alexandre C. Bastos Alcino Monteiro Pedro Oliveira João Tedim Mário G. S. Ferreira |
| author_facet | Marina M. Mennucci Rodrigo Montes Alexandre C. Bastos Alcino Monteiro Pedro Oliveira João Tedim Mário G. S. Ferreira |
| author_sort | Marina M. Mennucci |
| collection | DOAJ |
| description | This work compares different electrodeposition procedures to produce nickel black coatings as greener and less toxic alternatives to Cr(VI)-based coatings used in different applications. Nickel and nickel-plated brass served as substrates in studies with a Hull cell and polarization curves. After a set of comparative experiments, the best electrodeposition procedure was further studied and optimized. Optimal conditions were found with a bath consisting of 75 g/L NiCl<sub>2</sub>·6H<sub>2</sub>O + 30 g/L NaCl and a current density of 0.143 A dm<sup>−2</sup> applied for 5 min at room temperature. Furthermore, a pre-treatment with 18.5 vol.% of hydrochloric acid in water was found to be necessary to warrant good coating adhesion to the substrate. The black color is attributed to the development of a nanostructured surface that absorbs the incident light. Corrosion testing was performed in 0.5 M NaCl aqueous solution using electrochemical impedance spectroscopy (EIS) and polarization tests. |
| first_indexed | 2024-03-10T11:56:34Z |
| format | Article |
| id | doaj.art-002b0dec69de47a7a1febe2cbd8e44bb |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T11:56:34Z |
| publishDate | 2021-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-002b0dec69de47a7a1febe2cbd8e44bb2023-11-21T17:15:03ZengMDPI AGApplied Sciences2076-34172021-04-01119392410.3390/app11093924Nanostructured Black Nickel Coating as Replacement for Black Cr(VI) FinishMarina M. Mennucci0Rodrigo Montes1Alexandre C. Bastos2Alcino Monteiro3Pedro Oliveira4João Tedim5Mário G. S. Ferreira6DEMaC—Department of Materials and Ceramic Engineering, CICECO—Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, PortugalDEMaC—Department of Materials and Ceramic Engineering, CICECO—Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, PortugalDEMaC—Department of Materials and Ceramic Engineering, CICECO—Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, PortugalLeica—Aparelhos Ópticos de Precisão, S.A., Rua da Leica 55, 4760-810 Lousado VNF, PortugalLeica—Aparelhos Ópticos de Precisão, S.A., Rua da Leica 55, 4760-810 Lousado VNF, PortugalDEMaC—Department of Materials and Ceramic Engineering, CICECO—Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, PortugalDEMaC—Department of Materials and Ceramic Engineering, CICECO—Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, PortugalThis work compares different electrodeposition procedures to produce nickel black coatings as greener and less toxic alternatives to Cr(VI)-based coatings used in different applications. Nickel and nickel-plated brass served as substrates in studies with a Hull cell and polarization curves. After a set of comparative experiments, the best electrodeposition procedure was further studied and optimized. Optimal conditions were found with a bath consisting of 75 g/L NiCl<sub>2</sub>·6H<sub>2</sub>O + 30 g/L NaCl and a current density of 0.143 A dm<sup>−2</sup> applied for 5 min at room temperature. Furthermore, a pre-treatment with 18.5 vol.% of hydrochloric acid in water was found to be necessary to warrant good coating adhesion to the substrate. The black color is attributed to the development of a nanostructured surface that absorbs the incident light. Corrosion testing was performed in 0.5 M NaCl aqueous solution using electrochemical impedance spectroscopy (EIS) and polarization tests.https://www.mdpi.com/2076-3417/11/9/3924black nickel coatingselectrochemical testingelectrodepositionhull cellnanostructured coatings |
| spellingShingle | Marina M. Mennucci Rodrigo Montes Alexandre C. Bastos Alcino Monteiro Pedro Oliveira João Tedim Mário G. S. Ferreira Nanostructured Black Nickel Coating as Replacement for Black Cr(VI) Finish Applied Sciences black nickel coatings electrochemical testing electrodeposition hull cell nanostructured coatings |
| title | Nanostructured Black Nickel Coating as Replacement for Black Cr(VI) Finish |
| title_full | Nanostructured Black Nickel Coating as Replacement for Black Cr(VI) Finish |
| title_fullStr | Nanostructured Black Nickel Coating as Replacement for Black Cr(VI) Finish |
| title_full_unstemmed | Nanostructured Black Nickel Coating as Replacement for Black Cr(VI) Finish |
| title_short | Nanostructured Black Nickel Coating as Replacement for Black Cr(VI) Finish |
| title_sort | nanostructured black nickel coating as replacement for black cr vi finish |
| topic | black nickel coatings electrochemical testing electrodeposition hull cell nanostructured coatings |
| url | https://www.mdpi.com/2076-3417/11/9/3924 |
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