scholarly journals Long-Term Influence of Laser-Processing Parameters on (Super)hydrophobicity Development and Stability of Stainless-Steel Surfaces

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2240 ◽  
Author(s):  
Peter Gregorčič ◽  
Marjetka Conradi ◽  
Luka Hribar ◽  
Matej Hočevar
Keyword(s):  
Contact Angle ◽  
Stainless Steel ◽  
Processing Parameters ◽  
Nanosecond Laser ◽  
Stainless Steel Surface ◽  
Textured Surfaces ◽  
Laser Texturing ◽  
Important Challenge ◽  
Faster Development

Controlling the surface wettability represents an important challenge in the field of surface functionalization. Here, the wettability of a stainless-steel surface is modified by 30-ns pulses of a Nd:YAG marking laser (λ = 1064 nm) with peak fluences within the range 3.3–25.1 J cm−2. The short- (40 days), intermediate- (100 days) and long-term (1 year) superhydrophilic-to-(super)hydrophobic transition of the laser-textured surfaces exposed to the atmospheric air is examined by evaluating its wettability in the context of the following parameters: (i) pulse fluence; (ii) scan line separation; (iii) focal position and (iv) wetting period due to contact angle measurements. The results show that using solely a short-term evaluation can lead to wrong conclusions and that the faster development of the hydrophobicity immediately after laser texturing usually leads to lower final contact angle and vice versa, the slower this transition is, the more superhydrophobic the surface is expected to become (possibly even with self-cleaning ability). Depending on laser fluence, the laser-textured surfaces can develop stable or unstable hydrophobicity. Stable hydrophobicity is achieved, if the threshold fluence of 12 J cm−2 is exceeded. We show that by nanosecond-laser texturing a lotus-leaf-like surface with a contact angle above 150° and roll-off angle below 5° can be achieved.

scholarly journals Nanosecond Laser Fabrication of Hydrophobic Stainless Steel Surfaces: The Impact on Microstructure and Corrosion Resistance

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1577 ◽  
Author(s):  
Mehran Rafieazad ◽  
Jaffer Jaffer ◽  
Cong Cui ◽  
Xili Duan ◽  
Ali Nasiri
Keyword(s):  
Stainless Steel ◽  
Base Metal ◽  
Melting Process ◽  
Contact Angles ◽  
Laser Surface Texturing ◽  
Nanosecond Laser ◽  
Textured Surfaces ◽  
Laser Texturing ◽  
Steel Surfaces ◽  
The Impact

Creation of hydrophobic and superhydrophobic surfaces has attracted broad attention as a promising solution for protection of metal surfaces from corrosive environments. This work investigates the capability of nanosecond fiber laser surface texturing followed by a low energy coating in the fabrication of hydrophobic 17-4 PH stainless steel surfaces as an alternative to the ultrashort lasers previously utilized for hydrophobic surfaces production. Laser texturing of the surface followed by applying the hydrophobic coating resulted in steady-state contact angles of up to 145°, while the non-textured coated base metal exhibited the contact angle of 121°. The microstructure and compositional analysis results confirmed that the laser texturing process neither affects the microstructure of the base metal nor causes elemental loss from the melted regions during the ultrafast melting process. However, the electrochemical measurements demonstrated that the water-repelling property of the surface did not contribute to the anticorrosion capability of the substrate. The resultant higher corrosion current density, lower corrosion potential, and higher corrosion rate of the laser textured surfaces were ascribed to the size of fabricated surface micro-grooves, which cannot retain the entrapped air inside the hierarchical structure when fully immersed in a corrosive medium, thus degrading the material’s corrosion performance.

scholarly journals Modification of the copper wettability by nanosecond laser texturing

2021 ◽  
Vol 2119 (1) ◽  
pp. 012126
Author(s):  
M M Vasilev ◽  
Y G Shukhov ◽  
A A Rodionov ◽  
Y P Li ◽  
M K Lei
Keyword(s):  
Contact Angle ◽  
Laser Treatment ◽  
Environmental Exposure ◽  
Nanosecond Laser ◽  
Laser Texturing ◽  
Copper Surfaces ◽  
Over Time

Abstract Nanosecond laser microstructuring of copper surfaces was performed in this work. The contact angle value immediately after laser treatment decreased sharply and all samples were hydrophilic or superhydrophilic. Hydrophobization of the textured samples occurs as a result of environmental exposure over time. Oxidation and adsorption of carbon and its compounds from the atmosphere leads to a change in the wettability of the irradiated surfaces. The acceleration of hydrophobization process with decrease of fluence was found. It is shown that the stable contact angle, reached after one month, does not depend on the value of the fluence and is about 140°.

Broadband absorption of nanostructured stainless steel surface fabricated by nanosecond laser irradiation

2020 ◽  
Vol 31 (17) ◽  
pp. 175301
Author(s):  
Md Abu Taher ◽  
Sajin Ponnan ◽  
Hiteswar Prasad ◽  
Desai Narayana Rao ◽  
Sri Ram G Naraharisetty
Keyword(s):  
Stainless Steel ◽  
Laser Irradiation ◽  
Steel Surface ◽  
Nanosecond Laser ◽  
Stainless Steel Surface ◽  
Broadband Absorption

Corrosion protection of stainless steel by a self-assembled organosilane bilayer

2014 ◽  
Vol 61 (5) ◽  
pp. 307-313 ◽  
Author(s):  
Hairen Wang ◽  
Minya Li ◽  
June Qu ◽  
Zhiyong Cao ◽  
Geng Chen ◽  
...  
Keyword(s):  
Contact Angle ◽  
Stainless Steel ◽  
Corrosion Inhibition ◽  
Self Assembly ◽  
Ethanol Solution ◽  
Organic Layer ◽  
Stainless Steel Surface ◽  
Nacl Solution ◽  
Content Type ◽  
Self Assembled

Purpose – The purpose of this paper is to construct a self-assembled double layer of organosilane on the surface of stainless steel and to investigate its corrosion inhibitive capability. Design/methodology/approach – A monolayer of 3-glycidoxypropyltrimethoxysilane (GPTMS) was grafted onto an oxidized AISI 430SS (AISI 430 stainless steel) surface substrate from dry toluene solution. The hydrolysis of 1H,1H,2H,2H-perfluorodecyltriethoxysilane (PFDS) molecules was used to anchor a second organic layer from mixed water-ethanol solution. The adsorption behavior and corrosion inhibition properties of the monolayer and also the bilayer were investigated by potentiodynamic polarization, scanning electron microscope (SEM), Fourier transformed infrared spectroscopy (FTIR) and contact angle measurements. Findings – The GPTMS/PFDS bilayer was successfully deposited onto the oxidized AISI 430SS surface. The optimal assembling time for the filming of the first GPTMS monolayer is 6 hours. Suitable values of pH and temperature of the PFDS self-assembly solution were pivotal to the successful deposition of the second layer. Compared to the GPTMS monolayer, the GPTMS/PFDS bilayer exhibited a significant enhancement of the corrosion inhibition performance of AISI 430SS in NaCl solution. Research limitations/implications – The contact angle value measured on the bilayer-modified surface was somewhat lower than the reported value of a complete fluorinated surface. However, further optimization of the assembling condition is needed to obtain more orderly and denser films. Originality/value – This paper provides useful information regarding the preparation of an organosilane bilayer on the surface of stainless steel and its corrosion inhibition properties in NaCl solution. It illustrates potential application prospects of GPTMS/PFDS bilayers for surface treatment of stainless steel.

scholarly journals Nanosecond laser coloration on stainless steel surface

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Yan Lu ◽  
Xinying Shi ◽  
Zhongjia Huang ◽  
Taohai Li ◽  
Meng Zhang ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Steel Surface ◽  
Nanosecond Laser ◽  
Stainless Steel Surface

scholarly journals Influence of laser power in nanosecond laser texturing for a hydrophobic state on SS316L

2021 ◽  
Vol 15 (4) ◽  
pp. 8592-8600
Author(s):  
M.H. Zul ◽  
Mahadzir Ishak@Muhammad ◽  
M. H. Aiman ◽  
M. M. Quazi
Keyword(s):  
Surface Roughness ◽  
Contact Angle ◽  
Laser Power ◽  
Surface Engineering ◽  
Hydrophobic Surface ◽  
Morphological Properties ◽  
Nanosecond Laser ◽  
Time Interval ◽  
Beam Diameter ◽  
Laser Texturing

The use of lasers in surface engineering has recently made significant progress. The hydrophobic surface is commonly studied because of the application in various fields, including vehicles, aerospace, biomedicine, etc. Since these laser methods require many combination parameters, such as laser power (P), frequency (ƒ), scan speed (ʋ) and laser beam diameter (D), the effect of the parameters must therefore be investigated to produce the hydrophobic condition. This research tries to relate the laser power with the morphological properties and contact angle of the SS316L surfaces. Samples are subjected to laser texturing with different laser power settings. The surface is then characterised by surface roughness, and the contact angle is measured according to a specific time interval. The laser power output and energy density function on the surface and contact angle were investigated in these contexts experimentally. Surface roughness was defined and validated to show that the laser parameters' effect is effective and controllable. This study shows that the laser output intensity significantly contributes to regulating surface roughness and the substrate's wetting activity. The 18W and 24W laser outputs produce a spiked surface with various peaks that cause the surface to become hydrophobic over time because of the air-trap that happens in the valley.

Influence of Passivation on Wettability of AISI 304 Steel and its Corrosion Properties in Solution of Sodium Hypochlorite

2019 ◽  
Vol 810 ◽  
pp. 58-63
Author(s):  
Josef Hlinka ◽  
Stanislav Lasek
Keyword(s):  
Contact Angle ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Sodium Hypochlorite ◽  
Sessile Drop ◽  
Stainless Steel Surface ◽  
Corrosion Properties ◽  
Aisi 304 ◽  
Chemical Passivation ◽  
Lower Corrosion Rate

The contribution is aimed at corrosion propertied and wettability of basic graded of stainless steel commonly used in medicine as a standard for construction of instruments and other applications. Samples of AISI 304 (1.4301) steel were chemical passivated by nitric acid and tested for corrosion resistance in environment of sodium hypochlorite (NaClO), which is commonly used for basic disinfection of surfaces or devices in hospital facilities. It was found that chemical passivation of stainless steel surface increases its corrosion resistance and lower corrosion rate. Passivation layer also shows more polarization resistance. The wettability of passivated surface was measured by sessile drop method. Wettability itself determinates effectivity of disinfection process as the surfaces with lower contact angle may be cleaned and disinfected with more efficiency. It was proofed that chemical passivation increases wettability by lowering contact angle of treated surface.

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