Corrosion Types

Question 1

Abrasive action of two tightly fit surfaces, AKA rivet smoking.

Answer 1

Fretting

Question 2

The anode is formed under the ferrules of fluid lines fittings and in the closed area of lap joints.

Answer 2

Oxygen concentration cell

Question 3

Logical result if uniform surface corrosion is left untreated.

Answer 3

Pitting

Question 4

Occurs in the open area near aluminum lap joints when moving water can carry away positively charged aluminum ions.

Answer 4

Metallic ion concentration cell.

Question 5

Extreme case of intergranular corrosion.

Answer 5

Exfoliation

Question 6

Results in the formation of iron oxide or aluminum oxide. AKA dry corrosion.

Answer 6

Oxidation

Question 7

Occurs when a metal is subject to a tensile stress in the presence of a corrosive environment.

Answer 7

Stress Corrosion

Question 8

Corrosion that is the result of dissimilar metals riveted or otherwise jointed.

Answer 8

Galvanic corrosion

Question 9

Results when unprotected metal is exposed to an atmosphere containing battery fumes, exhaust gases, or industrial contaminants. The surface becomes dull by the metal being converted into corrosion salts.

Answer 9

Uniform surface corrosion

Question 10

Corrosion along the grain boundaries caused by improper heat treatment.

Answer 10

Intergranular corrosion

Question 11

Results from improperly cured wash primer under polyurethane enamel finish paints

Answer 11

Filliform corrosion