please help me to solve this problem with acurate answer. (Nuclear Energy ) Expl

Question

please help me to solve this problem with acurate answer. (Nuclear Energy )

Explain why aluminum used as a sacrificial anode needs to be kept in a solution of chloride ions. Sacrificial Anodes are highly active metals that are used to prevent a less active material surface from corroding. Sacrifical Anodes are created from a metal alloy with a more negative electrochemical potential than the other metal it will he used to protect. The sacrificial anode win be consumed in place of the metal it is protecting, which is why it is referred to as a "sacrificial" anode. Since alluminium is highly reactive in this series, so it is Kept in the chloride ions therefore corroded Al ions can react with it and can form AICI_3 complex, which will stop the reaction further. b) Define sensitization. Explain the available methods available for avoiding this effect in welded austenitic stainless steels. c) Identify what type/types of corrosion cell may be present in the following cases and identify anode/cathode and electrolyte in each case with rough sketches. (1.5 times 4 = 6) A copper valve in a steel tube exposed to a marine atmosphere. A steel bolt joining two steel plates placed in open air. Revealing the microstructure of a single phase alloy through chemical etching. A galvanized steel pipe underground.

Explanation / Answer

b) sensitization is granulation of chromium carbides in stainless steel when it is exposed to high temperatures.

sentization can be prevented by:

1) minimising the carbon content in steel.

2) avoiding high temperature or plonged exposure to heat

3) by mixing stabilizers.

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