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Nickel - PowerPoint PPT Presentation

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Nickel
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  1. Nickel Leung Hau Lam(32) Lau Ho Yin(30) Wong Pui San(43) Wang Kwun Sing(41) Class: 5D

  2. Introduction of Nickel • chemical element (Ni) • atomic number 28 • silvery-white lustrous transition metal • hard and ductile

  3. Physical properties

  4. USAGES • corrosion-resistant -use for plating metals • nickel alloy • catalyst for hydrogenation • Enzymes of some microorganisms and plants contain nickel as an active center

  5. USAGES • electroplatingand themanufacture ofalkalinebatteries • Nickel metal is used in making alloys (E.g. a "horseshoe magnet" made of alnico nickel alloy The composition of alnico alloys is typically 8–12% Al, 15–26% Ni, 5–24% Co, up to 6% Cu, up to 1% Ti. )

  6. APPLICATIONS • Nickel is used to make Nickel aluminide • made up ofnickelcombined with several other metals including aluminium,chromium, molybdenum,zirconiumandboron • Adding boron increases theductilityof the alloy and hardness • This alloy is extremely strong for its weight, five times stronger than stainless steel. Unlike most alloys, IC-221M increases in strength from room temperature up to 800°C.

  7. APPLICATIONS • Nickel aluminide - has very high thermal conductivity combined with high strength at high temperature -high strength and low density, used to coat blades ingas turbinesandjet engines

  8. APPLICATIONS • Nickel is used in hydrogenation • Hydrogenation is a chemical reaction between molecular hydrogen (H2) and another compound or element, usually in the presence of a catalyst. • Hydrogenation typically constitutes the addition of pairs of hydrogen atoms to a molecule, generally an alkene. Catalysts are required for the reaction to be usable

  9. APPLICATIONS • substitute for decorative silver • making nickel-cadmium battery • The nickel–cadmium battery (commonly abbreviated NiCad or NiCad) is a type of rechargeable battery using nickel oxide hydroxide and metallic cadmium as electrodes.

  10. APPLICATIONS • A fully charged NiCad cell contains: • Anickel (IV) oxide-hydroxidepositiveelectrode plate. • Acadmiumnegative electrode plate. • Aseparator. • Analkalineelectrolyte(potassium hydroxide).

  11. Equations • Thechemical reactionsin a NiCad battery during discharge are: • At the cadmium electrode: • At the nickel electrode: • The overall equation is

  12. ~END~