UNT CHEM 1415 - Corrosion and Batteries (2 pages)

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Corrosion and Batteries



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Corrosion and Batteries

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Detailed description of several types of batteries and what they are used for.


Lecture number:
20
Pages:
2
Type:
Lecture Note
School:
University of North Texas
Course:
Chem 1415 - Gen Chem Engineers
Edition:
1

Unformatted text preview:

CHEM 1415 1st Edition Lecture 20 Unit Corrosion Batteries Outline of Current Lecture I Corrosion II Batteries III Primary Cells IV Secondary Cells V Fuel Cells Current Lecture Corrosion o Degradation of metals by chemical reactions with the environment slow combination of oxygen with metals to form oxides o Uniform corrosion most visible forms ie rusting of automobiles o Galvanic corrosion occurs when two different metals contact each other in the presence of an appropriate electrolyte o Crevice corrosion degradation of the gap between two metals Batteries o A cell or series of cells that generates an electric current o Provide a means to harness the electrical work of a galvanic cell Primary Cells o Single use batteries that cannot be recharged o Most common is alkaline batteries o Mercury batteries are small primary cell batteries with a long lasting lifetime Secondary Cells o Rechargeable batteries o Nickel cadmium batteries popular in cellphones digital cameras and smaller computer devices o Lead acid battery Generates a potential of 2 0 V Rechargeable because lead sulfate product tends to adhere to the electrode surfaces Eventually the lead sulfate falls away from the electrodes and it cannot be recharged Fuel Cells These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute o Voltaic cell in which the reactants can be supplied continuously and the products of the cell reaction are continuously removed o Uses chemical reaction to produce electrical energy o Can be refueled on an ongoing basis o Most common is the reaction of hydrogen and oxygen to produce water



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