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Material Sciencr question 5 State the three things required for galvanic corrosion to occur, and
determine which of the following cases would provide protection against galvanic corrosion
(circle the letter(s)). Low carbon steel with a scratched coating of tin. Low carbon steel with a
scratched zinc coating. Medium carbon steel pipe connected to a brass fitting
Solution
a.)
1) Presence of two electrochemically different metals.
2) Metals surrounded by an electrolyte.
3) Metals are in electrical contact.
b.)
B. Low carbon steel with a scratched zinc coating.

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