Discussion
Consider the following statements about carbon composite and aluminium in contact:
1. The aluminium corrodes galvanically in the presence of an electrolyte.
2. A glass fibre layer or sealant is used to isolate them.
3. The carbon corrodes preferentially.
Which of the statements given above is or are correct?
Answer: C
Correct answer: 1 and 2 only
Statements 1 and 2 are correct. Statement 3 has the galvanic couple the wrong way round: carbon is the more noble of the pair, so it is protected and the aluminium is the one that corrodes. Getting the direction right matters, because it tells you which member needs the protection and which will be found pitted at inspection.
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