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Designing stainless steel surfaces with anti-pitting properties applying laser ablation and organofluorine coatings

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10.1002/adem.201700814
 
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hdl:2117/119631

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Armelín Diggroc, Elaine AparecidaMés informacióMés informacióMés informació
Moradi, Sona
Hatzikiriakos, Savvas G.
Alemán Llansó, CarlosMés informacióMés informacióMés informació
Document typeArticle
Defense date2018-06-01
Rights accessOpen Access
All rights reserved. This work is protected by the corresponding intellectual and industrial property rights. Without prejudice to any existing legal exemptions, reproduction, distribution, public communication or transformation of this work are prohibited without permission of the copyright holder
Abstract
Long-lasting and superhydrophobic stainless steel with anti-pitting properties is achieved by modifying conventional AISI 304L through a two-step strategy: 1) application of a femtosecond surface laser ablation treatment to generate micro-nano structures on the surface; and 2) deposition of organofluorine nanometric coating. Samples with two different patterns, namely paraboloid- and cauliflower-like, are approached and investigated by means of contact angle hysteresis, X-ray photoelectron spectroscopy, and electrochemical techniques. Results indicate that the stainless steel surface acquires efficient anticorrosive properties due to the homogenization and refinement of the patterned microstructure into a magnetite rich phase, in combination with the formation of a carbonaceous and sol–gel layer. The adherent semiconducting oxide layer is stable over time in presence of an aggressive chloride environment. The prepared superhydrophobic surfaces prevent the steel substrates from getting wet with water, protecting them from the pitting corrosion caused by the electrolyte intrusion. The corrosion resistance is explained by a mechanism in which, in addition of the silane coating, the air trapped into the micro-nano patterned surfaces plays an important role.
CitationArmelin, E., Moradi, S., Hatzikiriakos, S. G,, Aleman, C. Designing stainless steel surfaces with anti-pitting properties applying laser ablation and organofluorine coatings. "Advanced engineering materials", 1 Juny 2018, vol. 20, núm. 6, p. 1-33. 
URIhttp://hdl.handle.net/2117/119631
DOI10.1002/adem.201700814
ISSN1438-1656
Publisher versionhttps://onlinelibrary.wiley.com/doi/abs/10.1002/adem.201700814
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