Chapter 7 Corrosion and Cleaning Test 1

One of the major problems in the maintenance of the aircraft is the tendency of most _ to corrode.

Metals

The primary method of corrosion detection is______

Visual inspection

The presence of ____ on surfaces protected by painting or plating can indicate more advanced corrosion.

Blisters

___ in lap joints may be indicative of a well-advanced corrosive attack.

Bulges

A simple and familiar form of corrosion occurs when a metal is exposed to __ forming an oxide.

Oxygen

Smoking rivets are an example of ____ corrosion.

Fretting

The progress of filiform corrosion can be markedly decreased by the use of coatings with a high resistance to_______

Diffusion by water

By a process known as amalgamation, _ can penetrate any break in the finish, paint, or seal coating of a metal structure component and cause corrosion.

Mercury

The effects of filiform corrosion can be prevented by storing the aircraft in a ___ environment.

Low-humidity

False brinelling is a type of _ corrosion.

Fretting

On copper and copper alloys, corrosion appears as:

Greenish film

On steel, corrosion appears as:

Reddish rust

On aluminum alloys and magnesium, corrosion often appears as:

White powdery deposit

Surface pits caused by corrosion can become sites for:

Crack development

Which type of corrosion is found most often on extruded parts?

Exfoliation corrosion

Which type of corrosion is due to dissimilar metals in alloys?

Galvanic corrosion

Aluminum alloys and some stainless steels are particularly susceptible to which type of corrosion?

Intergranular

Which type of corrosion is characterized by the generation of considerable quantities of finely divided debris?

Fretting

Numerous threadlike filaments of corrosion products under the coating are characteristics of which type of corrosion?

Filiform

Which of these corrosive agents can likely be found in air cargo and must be dealt with immediately if found spilled?

Mercury