Corrosion Quiz Prelim

What is Corrosion?

Degradation of metals due to chemical or electrochemical reactions

Dry desert climates

Which environment is particularly detrimental to aircraft?

Reddish rust

What is a common sign of corrosion on steel?

Pilot age

Which factor does NOT affect corrosion?

High corrosion – resistant

Pure metals are generally:

Magnesium and aluminum

Which metals corrode easily?

Is more harmful to aircraft

In marine environments, moisture – laden air:

High humidity

Which factor increases corrosion rate?

Accelerate corrosion

Foreign material such as oil and dust can:

Increase dampness and corrosion

Micro – organisms on surfaces can:

Caustic liquid or gaseous agents

Direct chemical attack occurs due to:

Sealed lead – acid

Which battery type reduces acid spillage issues?

Four specific conditions

Electrochemical corrosion requires:

Wormlike traces

Surface corrosion is recognized by:

Wormlike traces under paint

Filiform corrosion appears as:

Aluminum and magnesium alloys

Pitting corrosion is common in:

Contact with dissimilar metals and electrolyte

Dissimilar metal corrosion can occur due to:

Crevice corrosion

Concentration cell corrosion is also called:

Grain boundaries of alloys

Intergranular corrosion attacks:

Intergranular corrosion

Exfoliation corrosion is an advanced form of:

Cannot always be detected by surface indications

Intergranular corrosion in aluminum alloy parts

The surface area of the anodic metal is smaller than the surface area of the cathodic metal

Galvanic corrosion is likely to be most rapid and severe when

Only when two dissimilar metals are in contact

Fretting corrosion is most likely to occur

Magnesium

Which of these materials is the most anodic?

Exfoliation

The lifting or flaking of the metal at the surface due to delamination of grain boundaries caused by the pressure of corrosion residual product buildup is called

Corrosion

Caustic cleaning products used on aluminum structures have the effect of producing

The presence of a passive oxide film

Which of the listed conditions is NOT one of the requirements for corrosion to occur?

Stainless steel

Which of these materials is the most cathodic?

Improper heat treatment

A primary cause of intergranular corrosion is

Intergranular corrosion

Which of the following may not be detectable even by careful visual inspection of the surface of aluminum alloy parts of structures?