Optical properties and spectral selectivity of copper oxide on stainless steel

1984 ◽  
Vol 10 (1) ◽  
pp. 105-119 ◽  
Author(s):  
T. Karlsson ◽  
A. Roos
Keyword(s):  
Stainless Steel ◽  
Optical Properties ◽  
Copper Oxide ◽  
Spectral Selectivity

scholarly journals OPTICAL PROPERTIES OF LASER-COLOURING MARKED STAINLESS STEEL

2021 ◽  
Vol 3 ◽  
pp. 242-244
Author(s):  
Pavels Narica ◽  
Svetlana Pan’kova ◽  
Vladimir Solovyev ◽  
Alexander Vanin ◽  
Mikhail Yanikov
Keyword(s):  
Stainless Steel ◽  
Optical Properties ◽  
Light Scattering ◽  
Dielectric Permittivity ◽  
Laser Scanning ◽  
Incidence Angle ◽  
Sample Surface ◽  
Laser Scanning Microscopy ◽  
Optical Measurements ◽  
Complex Dielectric Permittivity

Laser colour-marking method often displace conventional marking techniques. Complicated technology of laser-induced periodic surface structure creation on stainless steel samples allows changing their surface morphology and optical properties, which were studied in this work by atomic force microscopy (AFM), laser scanning microscopy, reflectance spectroscopy and ellipsometry. Reflectance spectra of the samples demonstrate reflectance maxima correlate with the visible colours of the samples and with the extrema in the non-monotonic spectral dependences of the derivative of real part of complex dielectric permittivity extracted from the ellipsometric data. Thus, the most intensive light scattering takes place when the real part of complex dielectric permittivity falls down quickly with changing wavelength. We did not observe any “azimuth anisotropy” in our optical measurements at constant incidence angle: the spectra were the same independently of the light incidence plane orientation (parallel or perpendicular to the previous laser light spot scanning direction). We suppose that this selective resonance-like light scattering is due to the sample surface inhomogeneity, which is the result of previous laser treatment. This assumption agrees with estimations based on laser microscope and AFM images as well as with predictions of Mie theory. Thus, the colours of the samples under study are due to the light scattering by randomly distributed surface species with different sizes. 

Enhancement of corrosion protection of low nickel austenitic stainless steel by electroactive polyimide-CuO composites coating in chloride environment

2019 ◽  
Vol 66 (6) ◽  
pp. 774-781 ◽  
Author(s):  
Jeetendra Kumar Malav ◽  
Ramesh C. Rathod ◽  
Vipin Tandon ◽  
Awanikumar P. Patil
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Copper Oxide ◽  
Corrosion Protection ◽  
Electrochemical Techniques ◽  
Ultra Violet ◽  
Austenitic Stainless Steels ◽  
Inorganic Filler ◽  
Content Type ◽  
Anticorrosion Performance

Purpose The purpose of this study is to improve the anticorrosion performance of low nickel stainless steel (AISI 201) in 3.5% NaCl by electroactive polyimide/copper oxide (EPI/CuO) composites coating. Design/methodology/approach Electroactive polyimide/copper oxide (EPI/CuO) composites were prepared by oxidative coupling polymerization followed by thermal imidization method. Findings The functional and structural properties of composites were characterized by X-ray diffraction, Fourier transmission infra-red and ultra violet-visible spectroscopy and the surface topography was characterized by field emission scanning electron microscope analysis and anticorrosion performance in 3.5 Wt.% NaCl was evaluated by electrochemical techniques. The obtained results of electrochemical techniques measurement indicated that the composites coated samples give better corrosion protection against attacking electrolyte. Originality/value The ever-increasing price of nickel (Ni) is driving the industries to use low-Ni austenitic stainless steels (ASSs). However, it exhibits relatively poor corrosion resistance as compared with conventional Cr-Ni ASSs. Nonetheless, its corrosion resistance can be enhanced by polymeric (electroactive polyimide [EPI]) coating. CuO particles exhibit the hydrophobic properties and can be used as inorganic filler to incorporate in EPI to further enhance the corrosion protection. The present research paper is beneficial for industries to use low-cost AISI 201, enhance its corrosion resistance and replace the use of costly conventional Cr-Ni ASSs.

scholarly journals Silica-Copper Oxide Composite Thin Films as Solar Selective Coatings Prepared by Dipping Sol Gel

2008 ◽  
Vol 2008 ◽  
pp. 1-5 ◽  
Author(s):  
E. Barrera-Calva ◽  
J. Méndez-Vivar ◽  
M. Ortega-López ◽  
L. Huerta-Arcos ◽  
J. Morales-Corona ◽  
...  
Keyword(s):  
Thin Films ◽  
Stainless Steel ◽  
Copper Oxide ◽  
Photoelectron Spectroscopy ◽  
Sol Gel ◽  
Silica Matrix ◽  
Composite Thin Films ◽  
X Ray ◽  
Molar Ratios ◽  
Steel Substrates

Silica-copper oxide (silica-CuO) composite thin films were prepared by a dipping sol-gel route using ethanolic solutions comprised TEOS and a copper-propionate complex. Sols with different TEOS/Cu-propionate (Si/Cu) molar ratios were prepared and applied on stainless steel substrates using dipping process. During the annealing process, copper-propionate complexes developed into particulate polycrystalline CuO dispersed in a partially crystallized silica matrix, as indicated by the X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analyses. The gel thermal analysis revealed that the prepared material might be stable up to400°C. The silica-CuO/stainless steel system was characterized as a selective absorber surface and its solar selectivity parameters, absorptance (α), and emittance (ε) were evaluated from UV-NIR reflectance data. The solar parameters of such a system were mostly affected by the thickness and phase composition of theSiO2-CuO film. Interestingly, the best solar parameters (α= 0.92 andε= 0.2) were associated to the thinnest films, which comprised a CuO-Cu2Omixture immersed in the silica matrix, as indicated by XPS.

The Antifouling Effects of Copper-Oxide Filler Incorporated Into Paint-Based Protective Films Applied to Steam Surface Condenser Tubes

2018 ◽  
Vol 10 (4) ◽  
Author(s):  
H. C. R Reuter ◽  
M. Owen ◽  
J. L. Goodenough
Keyword(s):  
Stainless Steel ◽  
Copper Oxide ◽  
Heat Exchangers ◽  
Thermal Power ◽  
Antibacterial Properties ◽  
Filler Concentration ◽  
Stainless Steel Tube ◽  
Protective Films ◽  
Fouling Factor ◽  
Double Pipe

Paint-based protective films (PPFs) are used to protect condenser tubes from corrosion and erosion but have been shown to be susceptible to biofouling. Here, the biocidal properties of copper-oxide fillers incorporated into PPFs are explored in this paper. Specifically, two PPFs filled with 20% and 50% filler (by weight) are tested in parallel with a nonbiocidal ordinary epoxy PPF, and bare stainless steel tube. Using double-pipe co-current flow heat exchangers installed at a thermal power plant, actual cooling water exiting the condenser is evenly distributed between the test tubes. Heat transfer in the condenser is simulated by heated water flowing through each annulus of the double-pipe heat exchangers, thereby maintaining repeatable outer convection conditions. An exposure test of 125 days shows that the 50% biocide-filled PPF has the lowest fouling factor of all the tubes. The nonbiocidal epoxy has the highest fouling factor and the 20% filled PPF behaves similarly. Both of these are greater than the bare stainless steel control tube. The 50% filled PPF is compared to the fouling of an existing admiralty brass tube and the shapes of the fouling curves are similar. This evidence suggests that provided the filler concentration is sufficiently high, there is the potential for the copper-oxide filler to reduce the asymptotic composite fouling factor by virtue of its antibacterial properties.

Spectral selectivity of composite enamel coatings on 321 stainless steel

2009 ◽  
Vol 93 (8) ◽  
pp. 1404-1410 ◽  
Author(s):  
Harlan J. Brown-Shaklee ◽  
William Carty ◽  
Doreen D. Edwards
Keyword(s):  
Stainless Steel ◽  
Spectral Selectivity
Sign in / Sign up

Export Citation Format

Share Document