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Improvement of electrochemical action of zinc-rich paints by addition of nanoparticulate zinc
PublicationThe influence of nanosized particles on electrochemical action of standard zinc-rich paints by means of SEM as well as potential and impedance measurements has been investigated. The motivation for doing this was to obtain additional electrical connection between the spherical microparticles themselves and zinc particles and steel substrate. Overall zinc content was at the level of 92% by weight. Samples with different concentration...
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Local properties of organic coatings close to glass transition temperature
PublicationAcrylic coating applied on copper substrate has been investigated at different temperatures starting from the ambient one up to the level above the glass transition temperature. Its local topographic and electric properties have been examined with the atomic force microscopy (AFM) based approach including dc current mapping and local impedance spectroscopy. The local findings have been compared with the information from global...
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Impedancyjne badanie korozji wżerowej. Impedance measurements of pitting corrosion
PublicationKryteria zachodzenia korozji wżerowej związane są z badaniami tego zjawiska metodą cyklicznej polaryzacji i opierają się na wartości gęstości prądu lub bezwzględnej wartości prądu płynącego w układzie. Na podstawie przeglądu literaturowego wybrano cztery kryteria stosowane przy badaniu stali stopowych metodą cyklicznej polaryzacji. Dla warunków prądowych odpowiadających kryteriom zachodzenia korozji wżerowej przedstawiono widma...
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Inhibitive effect of sodium molybdate on corrosion of AZ31 magnesium alloy in chloride solutions
PublicationIn this work, corrosion inhibition of the AZ31 magnesium alloy was investigated in NaCl solutions containing different amounts of sodium molybdate inhibitor. Electrochemical, hydrogen evolution, microscopic, and spectroscopic experiments were utilized to examine the mechanism of corrosion inhibition by molybdates. The results showed that Na2MoO4 inhibitor provides reliable inhibition at high concentrations (150 mM). Surface examination...
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Research on causes of corrosion in the municipal water supply system
PublicationThis paper presents results of failure analysis study to characterize the corrosion damage that occurred in the water supply system in Krakow. This analysis includes: electrochemical noise, linear polarization and resistometric measurements. Water aggressiveness of four water intakes was defined using Langelier and Ryznar indices. Results from this indices did not reveal the causes of considerable corrosion losses in water systems....
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Critical analysis of laboratory measurements and monitoring system of water-pipe network corrosion-case study.
PublicationCase study of corrosion failure of urban water supply system caused by environmental factors was presented. Nowadays corrosion monitoring of water distribution systems is an object of major concern. There is possibility of application broad range of techniques like gravimetric and electrochemical. Both kinds of techniques can be applied in laboratory and field conditions. In many cases researches limit the case analysis to measurements...
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Effects of hospital facilities on patient outcomes after cancer surgery: an international, prospective, observational study
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Global variation in postoperative mortality and complications after cancer surgery: a multicentre, prospective cohort study in 82 countries
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Global variation in anastomosis and end colostomy formation following left‐sided colorectal resection
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Pooled analysis of WHO Surgical Safety Checklist use and mortality after emergency laparotomy
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Elective surgery system strengthening: development, measurement, and validation of the surgical preparedness index across 1632 hospitals in 119 countries
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