{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,1]],"date-time":"2026-05-01T16:44:55Z","timestamp":1777653895086,"version":"3.51.4"},"reference-count":39,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2021,4,26]],"date-time":"2021-04-26T00:00:00Z","timestamp":1619395200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100006129","name":"FCT","doi-asserted-by":"publisher","award":["UIDB\/50011\/2020 & UIDP\/50011\/2020"],"award-info":[{"award-number":["UIDB\/50011\/2020 & UIDP\/50011\/2020"]}],"id":[{"id":"10.13039\/100006129","id-type":"DOI","asserted-by":"publisher"}]},{"name":"FEDER","award":["Projeto n.\u00ba POCI-01-0247-FEDER-024521"],"award-info":[{"award-number":["Projeto n.\u00ba POCI-01-0247-FEDER-024521"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Applied Sciences"],"abstract":"<jats:p>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 NiCl2\u00b76H2O + 30 g\/L NaCl and a current density of 0.143 A dm\u22122 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.<\/jats:p>","DOI":"10.3390\/app11093924","type":"journal-article","created":{"date-parts":[[2021,4,27]],"date-time":"2021-04-27T02:31:43Z","timestamp":1619490703000},"page":"3924","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Nanostructured Black Nickel Coating as Replacement for Black Cr(VI) Finish"],"prefix":"10.3390","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7188-6804","authenticated-orcid":false,"given":"Marina M.","family":"Mennucci","sequence":"first","affiliation":[{"name":"DEMaC\u2014Department of Materials and Ceramic Engineering, CICECO\u2014Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal"}]},{"given":"Rodrigo","family":"Montes","sequence":"additional","affiliation":[{"name":"DEMaC\u2014Department of Materials and Ceramic Engineering, CICECO\u2014Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1847-2332","authenticated-orcid":false,"given":"Alexandre C.","family":"Bastos","sequence":"additional","affiliation":[{"name":"DEMaC\u2014Department of Materials and Ceramic Engineering, CICECO\u2014Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal"}]},{"given":"Alcino","family":"Monteiro","sequence":"additional","affiliation":[{"name":"Leica\u2014Aparelhos \u00d3pticos de Precis\u00e3o, S.A., Rua da Leica 55, 4760-810 Lousado VNF, Portugal"}]},{"given":"Pedro","family":"Oliveira","sequence":"additional","affiliation":[{"name":"Leica\u2014Aparelhos \u00d3pticos de Precis\u00e3o, S.A., Rua da Leica 55, 4760-810 Lousado VNF, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7584-4641","authenticated-orcid":false,"given":"Jo\u00e3o","family":"Tedim","sequence":"additional","affiliation":[{"name":"DEMaC\u2014Department of Materials and Ceramic Engineering, CICECO\u2014Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2071-9851","authenticated-orcid":false,"given":"M\u00e1rio G. S.","family":"Ferreira","sequence":"additional","affiliation":[{"name":"DEMaC\u2014Department of Materials and Ceramic Engineering, CICECO\u2014Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2021,4,26]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"685","DOI":"10.1016\/j.solmat.2004.07.045","article-title":"Electrochemical deposition of black nickel solar absorber coatings on stainless steel AISI316L for thermal solar cells","volume":"87","author":"Sabio","year":"2005","journal-title":"Sol. Energy Mater. Sol. Cells"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"35","DOI":"10.1016\/S0927-0248(98)00113-5","article-title":"Characterization of black nickel solar absorber coatings electroplated in a nickel chlorine aqueous solution","volume":"56","year":"1998","journal-title":"Sol. Energy Mater. Sol. 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