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The Effect of Addition of Germanium to the Surface Phenomena in Silver Alloys

Jesiotr M., Trzaskowski W., Trochimiak D., Nawrocki P., Łukasik K., Myszka D.

Archives of Foundry Engineering

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2018

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Vol. 18, iss. 3

81--85

EN

The article describes the impact of germanium on the course of surface phenomena in casting alloys of silver used in gold smithing. The aim of this works is to describe the assessment of resulting alloys, comparing the area of raw castings and the impact of the addition content of the alloy on the hardness of the samples. The evaluation also was subject to corrosion resistance of giving a comparison of their use in relations to traditional silver alloys.

2

Study of the oxide layers on metals by local electrochemical analysis

Rublinetskaya Y., Slepushkin V., Gukin A., Ilinykh E., Stifatov B.

Journal of Achievements in Materials and Manufacturing Engineering

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2014

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Vol. 64, nr 2

90--92

EN

Purpose: In this given work we consider a method CVA that at on one polarization curve allows us to trace the process of formation of the oxide film on the metal surface (anodic part of the curve), while the cathodic part of the curve to estimate the phase composition and its resistivity. Design/methodology/approach: Anodic polarization of metal surfaces in alkaline solutions used for obtaining oxide nanolayers with certain functional properties. To control the process of obtaining nanofilms apply a variety of physical, physicochemical and electrochemical methods. Findings: Theoretical analytical expressions describing the kinetics of growth of the oxide layers are supported by experimental studies of anodic polarization of Pb in alkaline solution. Research limitations/implications: A special place among those methods takes Local Electrochemical Analysis (LEA), allowing localizing electrochemical process at any given point on the surface. Originality/value: Originality of this work is study of the oxide layers on metals by local electrochemical analysis.

3

Studies on the adhesion of oxide layer formed on X10CrMoVNb9-1 steel

Gwoździk M., Nitkiewicz Z.

Archives of Civil and Mechanical Engineering

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2014

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Vol. 14, no. 3

335--341

EN

The paper contains results of studies on the formation of oxide layers on X10CrMoVNb9-1 (P91) steel long-term operated at an elevated temperature. X10CrMoVNb9-1 steel operated at the temperature of 595 °C for 54,144 h was the studied material. X-ray structural examinations (XRD) were carried out, microscope observations using an optical and scanning microscope were performed. The native material chemical composition was analysed by means of emission spark spectroscopy, while that of oxide layers on a scanning microscope (EDS). Mechanical properties of the oxide layer – steel (substrate) were characterised on the basis of scratch test. The adhesion of oxide layers, friction force, friction coefficient, scratching depth was determined as well as the force at which the layer was delaminated. It has been found that the oxide layer formed under the influence of applied pressure is more degradeted in the areas where are porous and cracks.

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An Investigation of Oxide Layer Impact on Heat Transfer in MARIA Reactor Fuel Element

Suchcicki J., Uzunow N., Pytel K., Mieleszczenko W., Mołdysz A.

Journal of Power Technologies

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2013

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Vol. 93, nr 4

247--256

EN

Within the framework of test fuel examination it has been performed the irradiation of one of fuel elements to high level of burnup (ca. 60 %). Post-irradiation examinations proved that under high burnup it comes to local detachment of oxide layer from the fuel element cladding. Unilateral breaking away of the oxide layer of strong insulation properties from cladding surface may lead to disturbance of conditions for heat removal from the fuel. This effect has been numerically modeled by means of ANSYS FLUENT code. The numerical results confirmed the existence of heat flux redistribution in the spot of oxide layer detachment. Since the phenomenon for breaking away of oxide layer appears at high fuel burnup the thermal loads are getting lower than in most thermally loaded fuel elements so the safety margins for fuel operation are being preserved.