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179 results. per page « 1 2 3 4 5 6 7 8 9 10 11 12 »

XPS and XTEM study of aluminium nitride formulation by N2+ implantation of aluminium

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XPS characterisation of Pyrolite

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Title thin film is carbon-based

XPS characterization of porous and sealed anodic films on aluminium alloys.

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JES

XPS depth profiling analysis of passive surface layers formed on austenitic AISI 304L and AISI 316L SS after high-current-density electropolishing.

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SURF In this paper, the XPS depth profiling results of passive surface layers formed on nickel–chromium AISI 304L and nickel–chromium–molybdenum AISI 316L austenitic stainless steels after a standard electropolishing at current density of 50 A/dm*2 (EP50), and after a high current density electropolishing at 1000 A/dm*2 (EP1000) in the mixture of sulfuric/orthophosphoric acids electrolyte in the following proportions H3PO4:H2SO4 = 1:4 and 4:1 are presented. The results have shown, that in case of nickel–chromium austenitic stainless steel (AISI 304L) there were no detected significant differences in the chemical composition of the passive layer formed after EP50 and EP1000 electrochemical treatments. In the passive layer of nickel–chromium–molybdenum austenitic stainless steel, the chromium and molybdenum enrichment was noted after EP1000 electropolishing, but was not observed after EP50 operation.

XPS investigation of B(x)N(y)C(z) coatings deposited by laser assisted chemical vapour deposition

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XPS investigation of the chemical characteristics of Kapton films ablated by a pulsed TEA CO2 laser

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SURF Laser ablation of 125 µm-thick Kapton polyimide films was carried out in air using a pulsed TEA CO2 laser at 9.3 µm. Laser-produced fibers protruding from the ablated surface results in a bad surface quality. Changes in the composition and the chemical characteristics of the ablated surfaces were identified by X-ray photoelectron spectroscopy (XPS. The C/O and C/N atomic ratios as well as the peak area of the C ls spectra at 284.7 eV in the ablated area increase, while the peak areas of the C ls spectra corresponding to the carbonyl groups (C=O) in the imide system and the ether groups (C-O) decrease. These suggest that the fiber bundles consist mainly of carbon, Moreover, the amide groups, nitrile groups (-C- N) and the benzene derivatives were detected after laser irradiation due to the breakage of the C-N bonds in the imide ring and ether groups. Upon increasing the fluence to 10.6 J/cm*2, the shake up at 537.6 eV decreases further, yet the amide groups as well as the shake up at 291 eV almost disappeared. This is because benzene derivatives decompose completely and the carbonyl groups are eliminated from the aromatic systems due to a large temperature rise. Therefore, the increase in fluence may improve the thermal decomposition during the TEA CO2 laser ablation of the Kapton films.

XPS investigation of the chemical characteristics of Kapton films ablated by a pulsed TEA CO2 laser

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SURF Laser ablation of 125 µm-thick Kapton polyimide films was carried out in air using a pulsed TEA CO2 laser at 9.3 µm. Laser-produced fibers protruding from the ablated surface results in a bad surface quality. Changes in the composition and the chemical characteristics of the ablated surfaces were identified by X-ray photoelectron spectroscopy (XPS. The C/O and C/N atomic ratios as well as the peak area of the C ls spectra at 284.7 eV in the ablated area increase, while the peak areas of the C ls spectra corresponding to the carbonyl groups (C=O) in the imide system and the ether groups (C-O) decrease. These suggest that the fiber bundles consist mainly of carbon, Moreover, the amide groups, nitrile groups and the benzene derivatives were detected after laser irradiation due to the breakage of the C-N bonds in the imide ring and ether groups. Upon increasing the fluence to 10.6 J/cm*2, the shake up at 537.6 eV decreases further, yet the amide groups as well as the shake up at 291 eV almost disappeared. This is because benzene derivatives decompose completely and the carbonyl groups are eliminated from the aromatic systems due to a large temperature rise. Therefore, the increase in fluence may improve the thermal decomposition during the TEA CO2 laser ablation of the Kapton films.

XPS studies of molybdenum disulphide formation from ammonium tetrathiomolybdate solutions

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XPS studies of aluminium alloy surfaces with zincate treatment.

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It is well known that the adhesion strength of metal plating film on Al substrate should be remarkably improved by introducing double zincate treatment as a pretreatment process for metal plating on Al. At each step of alkaline etching, desmutting, the first zincate treatment, HNO3 dipping, and the second zincate treatment in the double zincate process, depth profiles and the chemical state of the surface elements were extensively measured by XPS. A set of surface structure models in the process was proposed to explain the improvement of the adhesion strength by double zincate treatment. By dipping the first zincate film in HNO3 solution, a granular zinc deposit of about 1 µm thickness, roughly deposited on Al passivation film ast the first zincate treatment, was dissolved, and zinc nano-particles wer believed to be concurrently formed in the Al passivation film of about 3 nm thickness. In the second zincate treatment the nano-particles should be exposed to the second zincate solution to act as nuclei for formation of a highly uniform and thin zinc film. The zinc particles were so close to the metallic Al substrate, that dipolar coupling such as Ald+...Od - ....Zn d+ would act to improve the adhesion strength of double zincate film on Al substrate.

XPS studies of the aluminium alloy surface with iron alloy zincate treatment.

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Adhesion strength of a metal plating film on Al substrate is known to be improved remarkably by introducing Fe alloy double zincate treatment as a pretreatment process for metal plating on Al. At each step of alkaline etching, desmutting, initial zincate treatment, HNO3 dipping, and the second Fe alloy zincate treatment in the double zincate process, depth profiles and the chemical state of the surface elements were measured extensively using XPS. Furthermore, a set of surface structure models in the process was proposed to explain the improvement of adhesion strength by Fe alloy double zincate treatment. By dipping the first zincate film in HNO3 solution, granular Zn-Fe alloy deposited on Al passivation film at the first zincate treatment was dissolved. Furthermore, approx. 10 nm particles of Fe-rich alloy were believed to be formed concurrently in the Al passivation film. In the second Fe alloy zincate treatment, the Fe-rich alloy particles are expected to be exposed to the second zincate solution to act as nuclei for the formation of a highly uniform and thin Zn-Fe alloy film. The adhesion improvement of Zn-Fe alloy film occurred because Fe-rich alloy particles were included with the Al passivation film. They were close to the metallic Al substrate where dipolar coupling of Al -.O Fe ioni c species would act to improve the adhesion strength of Fe alloy double zincate film on the Al substrate.

XPS Studies on Barrier Oxide Films Formed on Aluminium in Neutral Borate and Phosphate Solutions

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XPS & chemical sectioning are used to study anodising process & change in oxide composition in depth profiling. 20 refs

XPS study of cobalt sulphide coatings

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Following authors' studies of electrically conductive non-stoicheometric copper sulphides used for metallising plastics, title species are reported. Tables report a range of title coatings, with details of how formed and their compositions. The chemistry of sulphides formed (in many cases being multilayered) is noted, incl. variable valencies of Co. 17 refs

XPS study of the elemental enrichment on aluminium alloy surfaces from chemical cleaning

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SURF Native oxide structure on Al alloys is usually modified by chemical treatments prior to application of corrosion resistant coatings. Commercial modifications were studied to determine effects on alloy surfaces, which might affect interface between alloys and plasma polymers. Enrichments of alloying elements on metal surface beneath modified oxide showed correlation with data from corrosion-performance testing of interface engineered corrosion protection systems.

XPS study on potential suppression factors of suppressing in vitro apatite formation on anatase films prepared on various substrates.

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XPS, AES & Raman Studies of Antitarnish Film on Tin

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Application of ethylenediamine tetramethylidene phosphonic acid (EDTMP) was found more efficacious than chromates or molybdates in tarnish prevention on tin. A 10 min treatment forms a complex film which was analysed as 48% oxygen, 10.7% Sn, 23% nitrogen, 1%carbon, 10.55 phosphorus. It was deduced that N & O are co-ordinated with Sn in the film. EDTMP performance was compared with other agents by immersion for 40 mins in 2 gm/litre semi-cysteine. Data on solderability of tin-plated copper wire is shown. 20 refs