4.
Two years ago, a storage tank was constructed using cold rivets to join the steel sheets. Your
present inspection shows corrosion in the joined parts. What type of corrosion has formed in the joined
parts?
A.
Exfoliation
B.
Galvanic
C.
Intergranular
D.
Stress
5.
The impressed current method of cathodic protection preventsa metal structure corrosion by
A.
Using a source of alternating current
B.
Using a stronger electrolyte
C.
Preventing galvanic corrosion of the soil
D.
Balancing the electrical potential of the metal
6.
Which four conditions must be present before electrochemical corrosion occurs?
A.
An electrolyte, a conductor, a cathode, and a metal anode
B.
A cathode, a metal anode, an electrolyte, and an organic film
C.
A metal anode, a conductor, an organic film, and a cathode
D.
An organic film, a metal anode, a cathode, and an electrolyte
7.
Which of the following could produce a condition leading to corrosion?
A.
The reduction of a voltage rectifier
B.
The viscosity of a print
C.
The passivation process
D.
The misidentification of a metal
EN0562
5-26
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