Deck 19: Corrosion Protection

Question 1

Technician A says the dwell time for phosphoric acid on bare metal is approximately 10 minute. Technician A says seam sealers can be applied over bare metal surfaces. Who is correct?

A) A only
B) B only
C) Both A and B
D) Neither A nor B

Answer 1

D

Question 2

Technician A says acid rain is a known cause of oxidation on automobiles. Technician B says an insulated steel bolt or one with a special coating can be used to hold two aluminum parts together. Who is correct?

A) A only
B) B only
C) Both A and B
D) Neither A nor B

Answer 2

A

Question 3

____________________ adhesion occurs through chemical cross-linking when chemically matched paint products are applied over the top of each other. An example is applying a clear coat over the color coat made by the same manufacturer.

Answer 3

Chemical

Question 4

A ____________________ primer is a two-component primer which uses a phosphoric acid as reducer or vehicle which will also ensure proper etching of the surface over which it is applied.

Question 5

Technician A says te zinc phosphate coating will re-generate if a galvanized steel surface is scratched. Technician A says weld-through coating vaporizes and burns away in the weld zone as the weld nugget sufficiently protects the metal and it is no longer needed. Who is correct?

A) A only
B) B only
C) Both A and B
D) Neither A nor B

Question 6

An E-coating is a sprayed-on for corrosion protection that the manufacturer applies before shipping.

Question 7

Galvanic corrosion is a form of corrosion that occurs when two of more different types of metal come into contact with each other, causing the more reactive metal to break down.

Question 8

The process whereby one metal is coated with a thin layer or coating of another metal is called ____________________ . This is commonly done by hot-dipping or electroplating the steel to form a thin layer of zinc over the steel.

Question 9

Technician A says galvanic corrosion is a desirable form of corrosion. Technician B says the zinc coating on galvanized steel is a form of sacrificial corrosion. Who is correct?

A) A only
B) B only
C) Both A and B
D) Neither A nor B

Question 10

A sacrificial corrosion is a form of corrosion in which one metal such as zinc oxidizes, sacrificing itself to form a protective coating over another metal, thus slowing down the deterioration of the first metal.

Question 11

Technician A says steel rust is a form of preservation. Technician B says passivation is a self protective coating generated by aluminum. Who is correct?

A) A only
B) B only
C) Both A and B
D) Neither A nor B

Question 12

Technician A says weld through coating may be either a zinc or copper base. Technician B says that seam sealers are applied to joints of vehicles to protect against corrosion. Who is correct?

A) A only
B) B only
C) Both A and B
D) Neither A nor B

Question 13

A corrosion hot spot is an area that forms after metal has been heated above 1000 degrees F.

Question 14

Mechanical adhesion is achieved by sanding and abrading the surface, allowing the finish to 'bite' into or anchor itself to the walls of the sand scratches.

Question 15

Technician A says corrosion hot spots can occur as result of welding during the repairs. Technician B says a self healing corrosion protective compound is commonly used on inside door panels. Who is correct?

A) A only
B) B only
C) Both A and B
D) Neither A nor B

Question 16

Technician A says that wax-based anti-corrosion compound is a self-healing compound. Technician B says epoxy primers offer optimum protection against corrosion for bare steel. Who is correct?

A) A only
B) B only
C) Both A and B
D) Neither A nor B

Question 17

Technician A says the magnesium coating on the galvanized steel corrodes to protect the steel surface. Technician A says that aluminum does not corrode, and therefore will last much longer than steel. Who is correct?

A) A only
B) B only
C) Both A and B
D) Neither A nor B

Question 18

Technician A says that magnesium does not corrode and is lighter and stronger than steel. Technician B says a marine environment commonly results in an accelerated oxidation process. Who is correct?

A) A only
B) B only
C) Both A and B
D) Neither A nor B

Question 19

____________________ is a form of degradation of steel, aluminum, or nearly any other metal or form of matter, wherein the material reacts with oxygen together with an electrolyte, usually water, causing the material to break down and eventually dissipate.

Question 20

A ____________________ primer is material that has a tendency to absorb moisture or water, causing it to corrode.

Question 21

Explain how an anticorrosive compound is self-healing

Question 22

What is a corrosion hot spot?

Question 23

What is the ecoat on a vehicle and what does it offer as a corrosion preventer

Question 24

Discuss some of the corrosion protective measures the automobile manufacturers use to prevent corrosion between exterior parts.

Question 25

What is zinc phosphate coating used for?