Stress and Galvanic Corrosion

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Full name of Participant *

Corrosion is *

1 point

Oxidation of metal

Destruction of metal

deterioration of metal

All of the above

Water and two different metals when comes in contact with each other, the type of corrosion is *

1 point

dry corrosion

simple corrosion

wet corrosion

water corrosion

Metal whose corrosion takes place is *

1 point

active metal

an anode

passive metal

cathode

both a and b

Which of the following statement is true for stress corrosion? *

1 point

When metal stressed the coating on metal surface is cracked and corrosion starts.

The smaller cracked part acts as cathode

It cannot be takes place due to unexpected sudden failure of normally ductile metals subjected to a tensile stress.

formed due to small pit in metal surface.

Galvanic corrosion takes place when *

1 point

one metal corrodes preferentially to another when both metals are in electrical contact, in the presence of an electrolyte

both metal corrodes preferentially to another when both metals are in electrical contact, in the presence of an electrolyte

corrosion cannot takes place in the presence of an electrolyte

Galvanic corrosion takes place in presences of *

1 point

only one metal

two same metals

two different metals

metal and non-metal

Small cracked part acts as___ *

1 point

Anode

Cathode

electrolyte

inactive electrode

When metal is stressed ___ *

1 point

the coating on metal surface is cracked and corrosion starts.

the coating on metal surface is does not cracked

Corrosion prevented

cracked part becomes passive

Galvanic corrosion takes place because of *

1 point

metal transfer

electron transfer

oxygen ttransfer

hydrogen transfer

If galvanic corrosion considered, dissimilar metals and alloys have____ *

1 point

different electrode potentials

same electrode potentials

same oxidation potential

same reduction potential

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