Hw 7

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Unformatted text preview: Home Work 7 16.1 (a) Write the possible oxidation and reduction half-reactions that occur when magnesium is immersed in each of the following solutions: (i) HCl, (ii) an HCl solution containing dissolved oxygen, (iii) an HCl solution containing dissolved oxygen and, in addition, Fe2+ ions. (b) In which of these solutions would you expect the magnesium to oxidize most rapidly? Why? 16.5 For the following pairs of alloys that are coupled in seawater, predict the possibility of corrosion; if corrosion is probable, note which metal/alloy will corrode. (a) Aluminum and cast iron (b) Cadmium and zinc (c) Low-carbon steel and copper 16.12 For each form of corrosion, other than uniform, do the following: (a) Describe why, where, and the conditions under which the corrosion occurs. (b) Cite three measures that may be taken to prevent or control it. 16.13 Briefly explain why, for a small anode-to-cathode area ratio, the corrosion rate will be higher than for a large ratio. 16.14 (a) What are inhibitors? (b) What possible mechanisms account for their effectiveness? 16.D1 Suggest an appropriate material for each of the following applications, and, if necessary, recommend corrosion prevention measures that should be taken. Justify your suggestions. (a) Laboratory bottles to contain relatively dilute solutions of nitric acid (b) Barrels to contain benzene (c) Pipe to transport hot alkaline (basic) solutions (d) Underground tanks to store large quantities of high-purity water (e) Architectural trim for high-rise buildings ...
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