Quantitative assessment of structural and compositional colors induced by femtosecond laser : a case study on 301LN stainless steel surface
Shi, Xinying; Huang, Zhongjia; Laakso, Miku J.; Niklaus, Frank; Sliz, Rafal; Fabritius, Tapio; Somani, Mahesh; Nyo, Tun; Wang, Xiao; Zhang, Meng; Wang, Gang; Kömi, Jukka; Huttula, Marko; Cao, Wei (2019-04-14)
Xinying Shi, Zhongjia Huang, Miku J. Laakso, Frank Niklaus, Rafal Sliz, Tapio Fabritius, Mahesh Somani, Tun Nyo, Xiao Wang, Meng Zhang, Gang Wang, Jukka Kömi, Marko Huttula, Wei Cao, Quantitative assessment of structural and compositional colors induced by femtosecond laser: A case study on 301LN stainless steel surface, Applied Surface Science, Volume 484, 2019, Pages 655-662, ISSN 0169-4332, https://doi.org/10.1016/j.apsusc.2019.04.147
© 2019 Elsevier B.V. All rights reserved. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
https://creativecommons.org/licenses/by-nc-nd/4.0/
https://urn.fi/URN:NBN:fi-fe2019042513215
Tiivistelmä
Abstract
The topic of durable coloration and passivation of metal surfaces using state-of-the-art techniques has gained enormous attention and devotion with unremitting efforts of researchers worldwide. Although femtosecond laser marking has been performed on many metals, the related coloration mechanisms are mainly referred to structural colors produced by the interaction of visible light with periodic surface structures. Yet, general quantitative determination of the resulting colors and their origins remain elusive. In this work, we realized quantitative separations of structural colors and compositional pigmentary colors on 301LN austenitic stainless steel surfaces that were treated by femtosecond laser machining. The overall color information was extracted from surface reflectance, with structural color given by numerical simulations, and oxide compositions by chemical state analysis. It was shown that the laser-induced apparent colors of 301LN steel surfaces were combinations of structural and compositional colorations, with the former dominating the angular response and the latter setting up the brownish bases. In addition to the quantification of colors, the analysis method in this work may be useful for the generation and specification of tailored color palettes for practical coloration on metal surfaces by femtosecond laser marking.
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