It is important to be able to recognize galvanic corrosion. In the following lis

Question

It is important to be able to recognize galvanic corrosion. In the following list of cases, explain whether galvanic corrosion is a probable cause of the corrosion.

a) Steel rivits in aluminum drain gutters leak after 2 years of service

b) Aluminum drain plug in a steel automotive oil pan leaks for one month after installation

c) Testing of unconnected aluminum, copper, and steel specimens exposed in a laboratory reactor shows accelerated corrosion of aluminum.

d) Graphite fiber reinforced aluminum composite specimens show delamination of the fiber after exposure to salt spray test.

e) Carbon steel pipe leaks near the weld to stainless steel pipe of nearly the same diameter.

Explanation / Answer

galvanic corrision is  is an electrochemical process in which a metal corrodes by another in the presence of an electrolyte when both metals are in electrical contact.

a) yes, galvanic corrosion is the main cause for it. an aluminium and steel metals are in contact with water hence the electrochemical process takes place.

b)yes, galvanic corrosion is the main cause for it.

c) yes, galvanic corrosion is the main reason for it. an aluminium copper and steel metals are in contact with each other when the reactions are carried out in the reactor and changes takes place.

d)yes, galvanic corrosion is the main cause for this.

e) yes, galvanic corrosion is the main cause for this.

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