Question

why does corrosion occur in steel pipe connected to cu plumbing​

Answer 1

Explanation : A metal having lower standard reduction potential will act as anode and undergo corrosion when coupled to another metal having higher standard reduction potential.

Therefore, in the case of steel pipe connected to a copper. Steel will be the anode (due to the lowest reduction potential), where the copper has a higher reduction potential in about +0.34 V.

Answer 2

Answer:

Due to the electrochemical reaction the corrosion occurs in steel pipe which connects cu plumbing.

Explanation:

When steel pipe gets in contact with copper plumbing it get corroded easily, because both are different metals and get oxidized. The electrochemical corrosion happens where these metal connect in an electrolytic medium.