Showing papers in "Surface Technology in 1984"

TL;DR: In this paper, a critical review of the different methods of doping in TiO2 is presented and the spectral effects of doping including the possible relevance of phototropic effects are discussed.

TL;DR: In this article, the potential E-pH relationship of Co3O4 electrodes at temperatures between 200 and 700 °C was measured as a function of pH in chloride-containing and perchlorate-containing solutions.

TL;DR: In this article, the results show that WC-Co particles of diameters from 5 to 45 μm reach velocities of 100-500 m s−1 in the gas jet with an average value of 315 m s −1.

TL;DR: In this paper, the changes in the surface texture of AT-cut plates with chemical etching were investigated over the temperature range 290-360 K. The activation energy of the etching process was found to be related to the surface smoothness.

TL;DR: In this paper, the process of the electrolytic codeposition of nickel and iron from chloride electrolytes was investigated using the potentiostatic method using X-ray analysis.

TL;DR: In this paper, a study was carried out on the electrodeposition of cobalt, nickel and Co-Ni alloy from buffered (0.4 M H3BO3) simple sulphate baths containing 0.125 M CoSO4·7H2O, 0.875 M NiSO 4·6H 2O, and 0.75 M Ni SO4·6HO 2.

TL;DR: In this paper, the effect of various treatment processes such as surface pretreatment, dipping techniques and post-treatment processes on the coating quality, type and extent of defects was investigated.

TL;DR: A reproducible chemical cleaning procedure to remove milk deposits from the surface of stainless steel was designed in this paper, where the results showed that the contaminants were confined to a surface layer 5 nm thick of the stainless steel plate.

TL;DR: In this article, the acid base and redox properties of Fe 2 O 3 and Fe O 3 -Cr O 3 surfaces were studied and the effect on these properties of the various iron oxide-hydroxide modifications that are used as the starting materials is described.

TL;DR: In this article, the corrosion of aluminium metal was studied in 0.5 M and 0.1 M NaOH in water-methanol, water-ethanol and water-(ethylene glycol) solutions with various compositions.

TL;DR: In this article, the effect of varying the current density, the solution temperature and agitation as well as the addition of different chemicals was investigated on the size, shape and properties of the powder and the energy consumed.

TL;DR: An electrocatalytic method developed previously for the depolarization of the hydrogen evolution reaction (HER) on graphite, iron, steel, nickel and titanium substrate surfaces was employed to improve the polarization characteristics of gold.

TL;DR: In this paper, it has been shown that while the mixed RuO2TiO2 coated titanium anode deteriorates very quickly in the presence of ionic phosphate species, the electrode containing palladium and tin oxides in the coating mixture as well as the former catalyst exhibits almost equal electrocatalytic activity and a high corrosion stability in both dichromate and phosphate buffering systems.

TL;DR: In this paper, the electrochemical reduction of AlCl3 was studied in an NaClKCl equimolar mixture, in the concentration range from 3 × 10−3 to 10−1 mol 1−1, for the temperature range from 973 to 1223 K, using voltamperometric and chronopotentiometric techniques.

TL;DR: In this paper, a further development of a chloride-based cadmium plating bath containing 0.3 M CdCl2·( 5 2 )H2O, 0.4 M H3BO3, 2.0 M NH4Cl and 5 g gelatin 1-1 was described.

TL;DR: In this article, the equations developed for permeation rise-decay transients corresponding to different initial and boundary conditions are compared and explicit relations were obtained for computation of phenomenological hydrogen diffusivity in terms of experimentally measurable parameters such as the breakthrough time, the time lag and also the time constant for the rise and decay permeation curves.

TL;DR: In this article, the thickness of the Nernst diffusion layer in the hydroson tank is calculated from the limiting current density for zinc electrodeposition from the sodium zincate bath using a modified form of the equation for a rotating cylindrical cathode and also from the Vielstich equation for turbulent flow across a plane surface.

TL;DR: In this article, the authors investigated the breakdown of anodic alumina films with deep pores during the filling of the films in various non-dissolving electrolytes, assuming concentration changes in the pores.

TL;DR: In this article, the effect of a pulsating current on the micro-throwing power of metal deposits in the early stage of deposition was investigated by scanning electron microscopy, and it was shown that at the same average current density the micro throwing power increases rapidly with increasing pause-to-pulse ratio.

TL;DR: In this article, the activation energy of the etching process is found to be related to the formation of etch patterns elongated along the x axis, which can be understood in terms of asymmetrical etch rate distributions.

TL;DR: Variations in the creep properties of Sn-0.5at.%Bi alloy were studied by using samples of various grain diameters in the stress range 2.47-3.25 kgf mm−2 as mentioned in this paper.

TL;DR: In this article, a systematic investigation of the immersion and electrodeposition processes of thin tin coatings used as an underlayer for the deposition of the multilayer system Cu/Ni/Cr on a typical aluminium alloy, applied in the automobile industry and other branches of mechanical engineering, was carried out.

TL;DR: In this paper, the effects of air and ultrasonic agitation on hardness, ductility, tensile strength and composition of iron group alloy plating solutions have been studied and the results obtained show that by increasing the ultrasonic power the hardness of both alloys was increased significantly and their compositions changed.

TL;DR: In this article, the impedance of the porous PbO2 layer formed by electrooxidation of a complex "paste" on a PBO2-covered lead support has been measured over a range of potential.

TL;DR: Proton-induced characteristic X-ray emission has been used to reveal the adsorption of molybdenum (VI) on steel electrodes from inhibited simulated cooling water as mentioned in this paper.

TL;DR: In this paper, the effects of γ irradiation on the CH3I adsorption behavior was also evaluated under various experimental conditions, and it was revealed that silver sites are responsible for the dissociation of CH 3I.

TL;DR: In this article, the characteristics of the electrodeposition of thallium powder from sulphate baths containing a relatively low Tl + ion content (0.005-0.020 mol 1 -1 ) were examined.

TL;DR: In this article, the corrosion rates of copper and carbon steel in white petroleum oil were measured using a weight loss method, and the effects of an aliphatic sulphide, an aromatic sulphide and a mixture of both and of various concentrations of a mixed inhibitor (calcium phenate, calcium sulphonate, succinimide and zinc dithiophosphate) were also examined.

TL;DR: In this article, the dissolution of steel in HCl solution at 30 °C with and without benzotriazole (BTA) was studied and the corrosion rate and the anodic and cathodic polarization parameters were determined.

TL;DR: The zinc trifluoromethanesulphonate (Zn(CF 3 SO 3 ) 2 ) was prepared and its purity was better than 98.7% as discussed by the authors.