Sökning: "chromium VI"

Visar resultat 6 - 10 av 24 avhandlingar innehållade orden chromium VI.

  1. 6. Metallic materials for solid oxide fuel cells and electrolysers - Mitigating high temperature corrosion

    Författare :Mareddy Reddy; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; PVD; High-temperature corrosion; MCO coating; Interconnect; Balance of Plant; Chromium evaporation; SOFC;

    Sammanfattning : Solid oxide cells (SOCs) are high-temperature energy conversion devices that have great potential due to their high efficiency, low operating costs, and flexibility. SOCs can produce electricity from a variety of fuels as solid oxide fuel cells (SOFCs), and they can convert electricity to fuels as solid oxide electrolyser cells (SOECs). LÄS MER

  3. 7. Synthesis and Characterization of Transition Metal Diborides

    Författare :Jimmy Thörnberg; Johanna Rosén; Per Persson; Helmut Riedl; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; DCMS; HiPIMS; Titanium Diboride; Titanium Aluminum Diboride; Chromium Diboride; Microstructure; Hardness; Oxidation Resistance;

    Sammanfattning : This thesis is devoted towards physical vapor deposition (PVD) of thin films of transition-metal (TM) diborides, focused on the material system TiBx, Ti1-xAlxB2-y and CrBx. The metal diborides are a large family of compounds with both metallic and ceramic properties, due to its bonding nature being a mix of covalent and ionic bonds. LÄS MER

  4. 8. Selectivity and gas composition in electrochemical systems by mass spectrometry

    Författare :Aleksandra Lindberg; Göran Lindbergh; Ann M. Cornell; Susanne Holmin; Thijs de Groot; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; electrolysis; chlorate; selectivity; chromate; DSA; HER; OER; hypochlorite; ClER; catalysis; gases; NiMH battery; електролиза; хлорат; селективност; хромат; ДСА; реакција издвајања водоника; еволуција кисеоника; хипохлорат; еволуција хлора; катализа; гасови; NiMH батерије; elektrolys; klorat; selektivitet; kromat; DSA; vätgasutvecklingsreaktion; syrgasutvecklingsreaktion; hypoklorit; klorgasutvecklingsreaktion; katalys; gaser; NiMH batteri; Chemical Engineering; Kemiteknik;

    Sammanfattning : This doctoral thesis presents experimental studies of gaseous products of two electrochemical systems: the chlorate process and the nickel-metal hydride (NiMH) battery, employing mass spectrometry.The cathodic efficiency for the hydrogen evolution reaction (HER) of the chlorate process was investigated by employing ex-situ synthesized MnOx electrodes. LÄS MER

  5. 9. Environmental and health aspects of corrosion– importance of chemical speciation

    Författare :Yolanda Hedberg; Inger Odnevall Wallinder; Anna Karin Borg Karlsson; Susanna Wold; KTH; []
    Nyckelord :;

    Sammanfattning : During the last decades, the interest in corrosion of metals and alloys from an environmental and health perspective has increased rapidly as a consequence of stricter environmental and human exposure legislations, their extensive use as implant materials and an increasing understanding related to occupational and/or daily exposure to airborne particles. Corrosion-induced metal release, however, needs to be understood in detail and to include knowledge related to chemical speciation, i. LÄS MER

  7. 10. The High Temperature Corrosion of Alloy Sanicro 28

    Författare :Carolina Pettersson; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; alkali induced corrosion; chromate formation; Sanicro 28; oxidation of stainless steel; KCl induced corrosion;

    Sammanfattning : This thesis investigates the influence of potassium chloride in solid and gaseous form on the oxidation of alloy Sanicro 28 (35Fe27Cr31Ni). KCl induced corrosion of chromia forming alloys is important e.g. in fireside corrosion in biomass and waste fired power plants. LÄS MER