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11010 results. per page « 1 2 3 4 5 6 7 8 9 10 11 »

A chemical mechanism for in situ boron doping during silicon chemical vapor deposition

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A chemical method for the deposition of Bi2S3 thin films from a non-aqueous bath

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Room temp. chemical method is developed to deposit semiconducting Bi trisulphide thin films on glass. Method is based on non-aq. bath containing Bi nitrate and thioacetamide. Effect of annealing on structural, optical and electrical properties is studied.

A chemical method for the preparation of thin films of CdO and ZnO

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MCP Thin films of ZnO and CdO are prepared by chemical spray pyrolysis. Films obtained are suitable for many scientific studies and technological applications. For ZnO and CdO thin films, optical properties are investigated, energy gaps are estimated, absorption coeff., index refraction, extinction coeff. and real and imaginary dielectric constants as well as lattice parameters were calculated.

A chromate-free post-anodising treatment for aluminium alloys using a double-immersion process

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Describes title patented process to improve corrosion resistance of unsealed anodised films based on impregnation of corrosion inhibiting pigments. Step 1 involved immersion in aq. sol'n of nickel, zinc or cerium. Step 2 involves molybdate, tungstate or metavanadate. Salt spray tests show results at least as good as chromate coatings. 21 refs

A chromium-free conversion coating for magnesium-lithium alloy by a phosphate-permanganate solution.

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SURF A chromate-free conversion coating on magnesium-lithium alloy was obtained from a phosphate-permanganate solution. The morphology, the composition and the corrosion resistance of this coating were examined. The thin and non-penetrating cracked morphology with some deposits existed on the phosphate-permanganate conversion coating. The main elements of the conversion coating were Mg, O, K, P and Mn. The results of the electrochemical measurements and the immersion tests demonstrated that the corrosion resistance of the magnesium-lithium alloy has been improved by the phosphate-permanganate conversion treatment.

A Chromium-Free Conversion Coating of Magnesium Alloy by a Phosphate-Permanganate Solution.

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SURF A chromium-free conversion coating for AZ9lD magnesium alloy has been obtained by using a phosphate-permanganate solution, which has been developed without acid pickling. Examinations have been carried out on the conversion coatings for morphology, composition, adhesion force, and corrosion resistance. Results show that the conversion coatings are relatively uniform and continuous, with thickness from 7 µm to 10 µm. They demonstrate good adhesion to matrix and have some non-penetrating tiny holes on the surface. The main elements of the conversion coating of AZ9lD alloy are Mg, O, P, K, Al and Mn by EPMA analysis. Results of corrosion resistance test indicate that the corrosion resistance of the conversion coating by phosphate-permanganate solution matches that of the conversion coating by traditional chromate solution, but for the corrosion resistance after painting, the former is better than the latter.

A Clean Break from CFCs

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Discusses alternatives to halogenated hydrocarbon cleaning at, incl. no-clean soldering processes, and aqueous cleaning. Last process was adopted.

A Clean Job

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Case study of Swiss Oerlikon Co who decided to use AIII type cleaner, since aqueous cleaners were not candidates for the application in question. Primaclean (Dow Chemical) was used. Properties of this are listed, its recycling by re-distillation explained and plant layout shown with performance figures.

A clean solution for solvent problems

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Solvent recovery process of AGA Gas CmbH., Hamburg, is briefly described.

A clean thing

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Describes enclosed 'AIII' solvent cleaning plant at Oerlikon, Zurich.

A Clean Way to Electroplate

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Case study of US New England Tanury gold platers who coat spectacle frames, writing instruments etc, details their response to environmental pressures in cleaning, effluent and also use of nickel in applications where allergenic response is a hazard.

A cleaning compound for removing photoresist.

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Stripper incl. corrosion inhibitor & solvent

A Cleaning Refreshing Course

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"Tutorial" on effects of poor cleaning on subsequent electrodeposits in terms of poor deposit adhesion, blisters, roughness, pitting.

A closed loop electroplating setup

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Experience in use of sorption method of treating rinse bath solns. in combination with periodic 4-stage rinsing system is described in which soln. is subjected to sorption or concn. in stage 4, which is stage least polluted with electrolyte, is described. Pure water is regularly added to stage 4 to compensate for electrolyte loss. Soln level in first stage corresponds to electrolyte level in plating bath. Each subsequent stage is raised by about 50 mm compared with previous stage. Method avoids plating sludge formation and partial electrolyte filtration to remove precipitates, and extends sorbent life.

A cloud hangs over salt spray corrosion testing

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Although it is clearly stated in some Standards that title test has limited predictive ability for in-service atmospheric corrosion, it remains widely used for just this purpose. Even when used for Quality Control, the significant scatter in the results, poses problems. The French "Salt Spray Club" found that 10µm thick electrogalvanised zinc plated coupons gave a 35% scatter of results. Options for an alternative test were examined and some of the findings & recommendations are reported.