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quiz12fall00 - ENSC 3313 Fal12000 Quiz 12 Name"~ ewer any 4...

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Name "~ State a likely location for the US Air Force to store surplus aircraft. Provide an explanation! .Al§2, several aircraft stored at such a military base experienced unexpected corrosion of landing gear components about 3 ft. Above the ground. Deduce why! Tuscon, Arizona -an arid climate. A rule of thumb is that corrosion does not occur when the relative humidity is below 40%. Localized corrosion because of guard dogs marking their territory. This subject was discussed in class! 2. With respect to buried pipelines and corrosion a) why is soil resistivity important, b) why is corrosion usually worse under river beds or paved roads? a) It serves as the electrolyte in the corrosion circuit for external pipe corrosion. A high soil resistivity signifies a minimal corrosion problem. b) Low oxygen regions, hence the anodic zones of oxygen concentration cells. High oxygen regions are cathodic stimulating electron removal reactions such as 2H20 = 02 + 4e- ~ (OH)- 3 Pewter, which is mainly tin, was commonly used for tableware on old sailing ships. However, divers
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