Short- and long-term wettability evolution and corrosion resistance of uncoated and polymer-coated laser-textured steel surface

Conradi, Marjetka (author), Sever, Tina (author), Gregorčič, Peter (author), Kocijan, Aleksandra (author)

We present the results of one year observation of wetting and corrosion properties of nanosecond fiber laser-textured stainless steel, uncoated and coated with epoxy or FAS (fluoroalkylsilane)-TiO$_2$/epoxy. A comparative study was performed on samples kept under ambient conditions and in reduced air pressure and humidity. The results show the ability to induce wettability conversion from initially superhydrophilic to final superhydrophobic state either indirectly by ageing the uncoated laser-textured surface or directly by application of FAS-TiO$_2$/epoxy coating. The storage conditions significantly influenced the wettability development of uncoated laser-textured steel, i.e., the process of ageing was slowed down in reduced air pressure and humidity. Detailed surface chemical analysis revealed that adsorption of the organic matters from the surrounding media influences the wettability conversion and ageing. However, the ageing of the coated surfaces was not affected by the storage conditions. Corrosion stability of uncoated laser-textured surfaces was enhanced over time due to the wettability transition, depending on their morphology. Coatings represent a superior barrier over the texture and wettability with the stable long-term surface protection against aggressive media.

• Language: English
• Keywords: stainless steels, laser surface engineering, wettability conversion, surface chemistry, polymer coatings
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2019
• Number of pages: 15 str.
• Numbering: Vol. 9, iss. 9, art. 592
• PID: 20.500.12556/RUL-111111
• UDC: 544.722.3:669.14.018.8 (045)
• ISSN on article: 2079-6412
• DOI: 10.3390/coatings9090592
• COBISS.SI-ID: 1510570
• Publication date in RUL: 24.09.2019

Record is a part of a journal

• Title: Coatings
• Shortened title: Coatings
• Publisher: MDPI AG
• ISSN: 2079-6412
• COBISS.SI-ID: 523035673

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
• Licensing start date: 19.09.2019

Secondary language

• Language: Slovenian
• Keywords: nerjavna jekla, laserski inženiring površin, omočljivost, korozijska odpornost