<trans-abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">The oxidation kinetics of zirconium alloys corrosion can be divided in two phases that are detached by a transient state. The occurrence of the transient state is crucial from the corrosion perspective, since it accelerates the oxidation rate. This work employs in-situ electrochemical impedance spectroscopy to study Zr-Nb and Zr-Sn alloys at the temperature of 340° and the pressure of 15 MPa in the environment simulating the cooling agent of PWR reactor. The goal of long-term experiments (up to 9000 hours) was to characterise oxidation kinetics, depending on the exposure time and the type of zirconium alloy. The results showed that the transient state is achieved sooner for the Zr-Sn alloy.</trans-abstract>

Vysoká škola chemicko-technologická v Praze, Ústav energetiky

Institut for Energy, Joint Research Centre, Petten, Nizozemsko

Corrosion of Zr-Nb and Zr-Sn alloys under simulated environment of PWR reactor

<trans-abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">Nickel superalloys Inconel 713 and 738 belong among metallic construction materials used for components of advances gas cooled reactors. The project of applied research solved by the UCT Prague and RC Řež tested mechanical properties of these alloys in the starting phase and after the exposure to helium containing trace pollutants (CO, H2, CH4, H2O) at the temperature of 900°C for a period of 1000 hours. The samples of tested alloys were made from: a) the virgin cast material, b) remanufactured material (revert 100R) and c) casting of previous materials in the ratio of 50V/50R. To identify mechanical properties of the materials after exposure, tensile tests and structural analyses by SEM were carried out. The changes of properties after the exposure of tested alloys and the same alloys made in various procedures were compared. While the yield and tensile strengths dropped insignificantly for Inconel 713, the plummeted for Inconel 738. The 50V/50R state showed better mechanical properties than the revert 100R state.</trans-abstract>

Testing of mechanical properties of 713 and 738 inconels for advanced reactors

<trans-abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">A contact between the primary medium containing boric acid and construction metallic materials cannot be avoided in production conditions of the primary circuit of nuclear power plants. The goal of this experimental project was to simulate selected exposures of construction materials to the primary medium and quantify its corrosion impacts. The basic factors affecting corrosion include the temperature of the material surface, acid concentration and the possibility of steam suction from the surface. The steam layer forms at a high temperature and protects the surface from the contact with boric acid and prevents corrosion. Evaporation of boric acid also depends on the quantity of water (boric acid concentration). The excess of water enables distillation of boric acid and the excess of boric acid results in formation of a harmless glasslike layer from the boric acid melt.</trans-abstract>

The corrosion of construction materials induced by boric acid

<trans-abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">Under certain circumstances, timber protective coatings may accelerate corrosion of metallic fasteners. The phenomenon of metal corrosion in wood chemically modified with silicones is a crucial factor for definition of appropriate rules for application of these materials on timber. The study presents results of the impact of modified spruce (Picea Abies L.), oak (Quercus SPP.) and larch (Larix decidua Mill.) timber and standard steel, copper and galvanised steel nails. Samples of timber with driven nails were exposed to the environment of 30°C temperature and 100% atmospheric humidity for a period of 6 weeks, when humidity of wood approximated the point of fibre saturation. After the exposure, the surface of steel nails removed from the timber was visually evaluated; corrosion products from selected samples were analysed using infrared spectroscopy. Based on the analyses results, the hypothesis of material compatibility between modified spruce (Picea Abies L.) timber and steel fixtures in the environment with high atmospheric humidity was formulated. After the exposure period, the extent of the surface corrosion of steel nail was lower than in untreated reference timber (without the protective coating).</trans-abstract>

Katedra stavebních hmot a diagnostiky staveb, VŠB – TU Ostrava

Oddělení laboratorního výzkumu geomateriálů, Ústav geoniky AV ČR, v.v.i, Ostrava

Corrosion of metal fasteners in the silicone modified wood

<trans-abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">Unsuitable storage conditions and use of materials which may be a source of pollutants in indoor environments are major threats to the long-term preservation of historic metal objects. Materials proposed for use in protecting and storage of museum or archive collections need to be sufficiently verified in terms of safety for the protected objects before these materials can be safely recommended. One of the basic techniques used for the purpose of testing of new materials (and verifying of those that are already in use) is the Oddy test whose advantages lies in its simple requirements for the experimental equipment and a possibility to modify this method for a particular use. In this work, a variant of the Oddy test was applied with a modification for a specific case – evaluation of materials used for recasing of daguerreotypes. Besides the commonly used visual assessment, electrochemical reduction of corrosion products on the exposed samples was used to compare the Oddy test results. The results indicate that the influence of the test materials is minor compared to the influence of the state of the daguerreotypes surface. This conclusion is consistent with expectations about safety of the tested materials that are used in conservation practice for the protection of archival and historical photographic collections.</trans-abstract>

Ústav kovových materiálů a korozního inženýrství, VŠCHT Praha

Evaluation of materials for recasing and preservation of daguerreotypes using modified Oddy test

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The journal is primarily focused on corrosion engineering and surface treatment of metallic materials. We accept also articles concerning degradation of paints, enamels and other non-metallic materials used for corrosion prevention of metals. Another field of interest is conservation and restoration of cultural heritage. In this case we accept contributions concerning all materials (metals, wood, paper, leather, textiles, stone, glass and ceramics).  Why subscribe and read   Official Journal of the Association of Czech and Slovak Corrosion Engineers, premier source of high quality research results from all over the world with special emphasis on Central and Eastern Europe;  over 55 years of experience in publishing original papers dealing with corrosion science, engineering and technology;  focused on research in corrosion and surface treatment as well as experiences in practice and „case studies“;  original papers that advance understanding of both the fundamentals of corrosion and its application;  excellent articles authored by researchers from all over the world, who appreciate our fast, fair and constructive peer review provided by experts in the field of corrosion engineering.   Why submit   Fast, fair and constructive peer review  Fast publication process („submission→published article“ takes usually 3-6 months)  High quality electronic publication technologies  Open access (simple and charge-free access for every researcher)   Rejection Rate   10%   Archiving  Sciendo archives the contents of this journal in Portico - digital long-term preservation service of scholarly books, journals and collections.  Plagiarism Policy  The editorial board is participating in a growing community of Similarity Check System's users in order to ensure that the content published is original and trustworthy. Similarity Check is a medium that allows for comprehensive manuscripts screening, aimed to eliminate plagiarism and provide a high standard and quality peer-review process. 