Material Sciencr question 5 State the three things required

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.