No abstract available

No abstract available

No abstract available

[en] Corrosion properties of anodized amorphous zirconium base alloys have been investigated. The dependence of protective properties on the oxidizing voltage, thickness, structure and composition of anodic oxide film is ascertained. 2 refs.; 2 figs.; 1 tab

No abstract available

[en] The authors have grown barrier anodic coatings on samples of aluminum alloy with different elemental surface compositions. In one series of experiments, they characterized the surface composition present on 6061 aluminum alloy samples after different chemical treatments including a detergent-water and methyl-ethyl ketone solvent clean, a 50% nitric acid-water etch, and a concentrated nitric acid-ammonium bifluoride etch. They anodized samples which were prepared similarly to those analyzed to evaluate the practical effects of the three different surface compositions. The anodization voltage rise time to 950V at constant current was used as a figure of merit. The solvent cleaned and the 50% nitric acid etched samples required, respectively, 113% and 41% more time to reach 950V than the concentrated nitric acidammonium bifloride etched samples. In a second series of experiments, they alternately anodized groups of either 6061 or 1100 (commercially pure) aluminum alloy, observed rise times to 950V, and measured chloride ion concentrations in the electrolyte. Longer rise times and higher chloride ion concentrations were observed for the 1100 samples. It was observed that the chloride ion concentration fell from initially high levels when 6061 samples were anodized. The results of both series of experiments augment the results of other investigators, who report that the surface species initially present on aluminum have a significant effect on anodic film formation

No abstract available

No abstract available

[en] The article is devoted to the topical problem of choosing the main parameters of vibrating technological machines used in many technological processes, including the aviation industry. It is shown that the solution of this problem is complicated by the need to create a spatial structure of the vibrating field, which is found, for example, in the vibrating devices designed for oriented placement of rivets in the container (perforated glass) before anodizing, by reporting the last simultaneous vibrations in the vertical and horizontal planes. For the solution of this and similar problems the article offers the method of construction of the mathematical models reflecting features of dynamic interaction of a working environment with vibrating surfaces of technological machines, allowing to choose parameters of a vibrating field by means of structural mathematical modeling. (paper)

[en] Quantifying the resistances that different components of microbial electrolysis cells (MECs) contribute to the total internal resistance is important for understanding how different reactor configurations affect overall performance. The impact of the reactor architecture was examined here by varying the relative sizes of the electrodes and quantifying the changes in resistances of the electrodes and limiting current densities as a function of the applied potential (E_ap). The MECs with equal cathode:anode size ratios (S_R=1), showed a steady increase in current up to 1.8 mA for E_ap’s ≤ 0.9 V. However, lower limiting currents were obtained for configurations with smaller anodes as shown by a lack of an increase in current for E_ap > 0.7 V (limiting current of 0.8 mA, S_R=16, and 1.0 mA, S_R=4). The largest component of the internal resistance changed with the relative sizes of the electrodes. For example, the cathode resistance was 58% of the internal resistance for the configuration of S_R=1 and 51% for S_R=2, but the anode was 57% of the internal resistance for S_R=16. These results show how differences in reactor architectures can be quantified in terms of individual electrode resistances and limiting currents using polarization data obtained by varying the applied potentials.