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Cleaning And Corrosion > Cleaning And Corrosion > Flashcards

Cleaning And Corrosion Flashcards

1
Q

Corrosion treatment requires these basic steps:

A

Remove
Neutralize
Restore/Protect

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2
Q

3 basic requirements for the formation of corrosion

A

Electrical potential difference within metal.
Conductive path between areas.
Covered with Electrolyte.

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3
Q

White powder which forms on the surface of aluminum when it corrodes is a…

A

Chemical Salt

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4
Q

3 steps that can be taken to minimize damage from corrosion:

A

Minimize electrical potential difference.
Eliminate conductive path with insulating barrier.
Prevent electrolyte contacting metal.

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5
Q

When electrolytic or galvanic corrosion occurs between an aluminum structure and steel bolt, the _____ will be the metal that is corroded.

A

Aluminum

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6
Q

Another name for dry corrosion is:

A

Rust/Oxidation

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7
Q

Exfoliation usually develops in _____ metal parts

A

Extruded

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8
Q

Stress corrosion occurs when a part is under _____ stress in a corrosion environment.

A

Tensile

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9
Q

Corrosion that forms inside a metal along the grain boundaries is called:

A

Intergranular corrosion

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10
Q

Intergranular corrosion may often be detected by either of these two types of nondestructive inspections:

A

X-ray

Ultrasonic

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11
Q

The scum that forms inside the fuel tanks of some jets aircrafts is caused by:

A

Microbes and bacteria in the fuel.

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12
Q

Type of finish used to protect the inside of a battery box against corrosion is:

A

Polyurethane enamel

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13
Q

A solution of _____ and water is used to neutralize fumes from a nickel cadmium battery.

A

Boric acid.

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14
Q

A piano hinge should be lubricated with a _____ lubricant.

A

Water displacement

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15
Q

Steel cables can be protected from corrosion by spraying them with a _____ lubricant.

A

Water displacement

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16
Q

Penetrant inspection _____ be used on steel parts to detect a surface crack.

A

Can

17
Q

Corrosion may be removed from aluminum surfaces by scrubbing them with…

A

Nylon scrubber/ Scotch Brite

18
Q

A chemically deposited oxide film on an aluminum surface is called…

A

Alodizing

19
Q

One of the best methods for removing the corrosion products from rusted steel parts is a/an..

A

Abrasive blasting.

20
Q

Galvanizing is a method of protecting steel with a coating of?

A

Zinc

21
Q

A fully formed anodized film is…

A

Hard

22
Q

Before paint will stick to a cadmium plated surface, the surface should be etched with a solution of…

A

Chromic acid

23
Q

Highly stressed steel parts should not be cleaned by scrubbing them with a wire brush because of the danger of…

A

Stress concentrations

24
Q

Oil and grease may be removed from acrylic plastics and rubber by wiping them with a rag dampened with…

A

Aliphatic naphtha.

25
Q

List 9 types of corrosion.

A 
Oxidation, 
Intergranular, 
Exfoliation, 
Stress, 
Galvanic, 
High Metallic ion concentration cell,  
Low Oxygen concentration cell, 
Fretting, 
Filiform, 
Uniform Surface
26
Q

Six corrosive agents:

A 
Air 
Water
Acidic Alkali
Salt
Mercury
Organic Matter
27
Q

_____ metals are damaged almost equally by acids or alkalis, but _____ may be damaged more by a strong alkaline solution than by acid.

A

Ferrous; Aluminum

28
Q

Filiform corrosion consists of threadlike filaments of corrosion that form on the surface of metals coated with organic substances such as paint. (T/F)

A

True

29
Q

What causes intergranular corrosion?

A

Improper heat treatment

30
Q

The most fundamental and important rule for corrosion control is to?

A

Keep it clean.

31
Q

The use of non-recommended cleaning compounds can result in a condition know as…

A

Hydrogen Embrittlement.

32
Q

What causes corrosion in aircraft fuel tanks?

A

Microbes and Bacteria in the fuel.

33
Q

Cadmium plating, galvanizing and cladding protect the case metal by a process know as…

A

Sacrificial corrosion.

34
Q

An electrolytic process that forms a surface of oxide film is called “chemical treatment or alodining”.
(T/F)

A

False

35
Q

What is oxidation?

A

Dry corrosion or rust

36
Q

Three types of inspection?

A

Ultrasonic, X-ray, Visual

37
Q

7 common locations for corrosion on a plane?

A

Wheel well, lavatory, battery compartment, inlets for engine, exhaust area, cables, fuel tank.

Cleaning And Corrosion (2 decks)

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