Wyniki wyszukiwania - BazTech

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Improvement of Resistance of Cast-iron Heat Exchangers to High-temperature Corrosion

Orłowicz A. W., Tupaj M., Trytek A., Mróz M., Radoń M., Jacek M.

Archives of Foundry Engineering

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2018

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Vol. 18, iss. 3

49--52

EN

The paper discusses the possibility of improving resistance of heat exchangers made of gray cast iron with flake graphite to high-temperature corrosion by providing them with metallic coatings. A metallic coating containing 76.9% Ni, 19.8% Cr, 1.7% Si, 0.9% Fe, and 0.9% Mn was applied by means of the plasma spraying method and subjected to cyclically variable thermal loads in the atmosphere of solid fuels combustion products (oxygen, sulfur, chlorine, and sodium). In a 30-day thermal load test held at temperature 500°C it has been found that thickness of the metallic coating decreased from the initial (240 ± 6) μm to (231 ± 6) μm. The depth to which sulfur, chlorine, and sodium penetrated the coating was about 30 μm. Increased oxygen content occurred along the whole coating depth. In the coating area adjacent to the substrate surface, the content was twice as high compared to this observed in the initial coating material. Although presence of oxygen was found within the whole depth of the coating, i.e. (231 ± 6) μm, no signs of susceptibility of the sprayed metallic layer to separation from substrate of gray cast iron with flake graphite were found.

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Właściwości fizykochemiczne powierzchni wybranych materiałów po obróbce strumieniowo-ściernej

Zaborski S., Stechnij T., Masalski J., Poroś D.

Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika

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2017

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z. 89 [295], nr 4

555--561

PL

Celem prezentowanych wyników badań jest ocena stanu warstwy powierzchniowej stali oraz metali lekkich w kontekście parametrów obróbki strumieniowej. Referat zawiera wyniki pomiarów, takich jak: odporność na korozję, chropowatość i mikrotwardość. Praca przez analizę materiałów prowadzi do oceny właściwości użytkowych wyrobów produkowanych z blach.

EN

The aim of presented results of the investigations is the assessment of the state of the surface layer of steels and light metals in the context of the parameters of the blasting. This article contains the results of measurements of resistance to corrosion, roughness and microhardness. This work, through material analysis, leads to the assessment of the performance of sheet metal products.

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Nowe materiały ogniotrwałe o niskiej rozszerzalności cieplnej oparte na dwuglinianie Ca w różnych kombinacjach

Jonas S., Drygalska E., Nadachowski F., Czyżewska A., Krupa G., Skalska M.

Materiały Ceramiczne

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2011

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T. 63, nr 2

350-354

PL

Materiały wytworzone na bazie dwuglinianu Ca w różnych kompozycjach zawierających wysokoogniotrwałe tlenki charakteryzują się niskim współczynnikiem rozszerzalności cieplnej a i bezkrzemianowym składem chemicznym. W oparciu o dane termodynamiczne (w tym diagramy fazowe) przedyskutowano ich specyficzne walory użytkowe i zaproponowano możliwość zastosowania w różnych gałęziach przemysłu.

EN

New non-silicate refractories based on CaAl4O7 and containing various oxides were studied. These materials have very low thermal expansion coefficients. Their specific properties were discussed on the basis of thermodynamical data (including phase diagrams). A possibility of application of these new materials in various industry branches was indicated.

4

Electrolytic polishing of corrosion-resistant metal stents

Nawrat G., Waś J., Gonet M., Simka W., Bold T.

Polish Journal of Chemical Technology

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2003

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Vol. 5, nr 3

65-68

EN

The paper deals with investigations on the influence of the parameters of the electrochemical and chemical treatment of stents made of steel type 00H17N14M2A on their corrosion resistance in constitutional fluids. The influence of the chemical composition of baths used for their electrolytic polishing and chemical passivation on the quality of the surface of the stents and the working parameters of their final treatment were determined, as well as the resistance of polished and passivated stents to pitting corrosion in Tyrode's and chloride solutions.