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Hand Tools > Materials And Corrosion Chap 6 > Flashcards

Materials And Corrosion Chap 6 Flashcards

1
Q

Metals and alloys in aircraft should conform to …

A
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2
Q

How are metals and alloys identified

A

Colour codes

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3
Q

What do the British measure in

A

Standard wire gauge

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4
Q

What do french measure in

A

mm

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5
Q

What do Americans measure in

A

1000th of an inch

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6
Q

Def stan

A

Most frequently used in MOD

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7
Q

Conformity

A

A certificate to prove that the materials used are good quality

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8
Q

What is the colour coding

A

Used for rapid identification not to be used as sole means of identification

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9
Q

How are gauge sheets marked

A

Printed with ink on the surface

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10
Q

Ferrous metals

A

Contains mostly iron

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11
Q

Non-Ferrous metals

A

Contains no iron

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12
Q

Annealing

A

Changes the metal into a soft condition

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13
Q

Heat treatment

A

Metal is quenched and gives the metal specific properties

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14
Q

Refrigerated storage

A

Slows down the natural age process

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15
Q

Artificially age treatment

A

Precipitation (accelerated) treatment to get the maximum strength

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16
Q

Natural age process

A

Occurs at room temperature

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17
Q

Environmental damage

A

Includes corrosion, erosion and degradation of surface finish.

Prevention = coatings, tapes and corrosion prevention compounds

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18
Q

What does corrosion lead too

A

Reduce static strength, stress corrosion cracking, shortens fatigue life

19
Q

Composite structure gets affected by what ? (4)

A

Fuels oils lubricants and UV light

20
Q

Permanent coating

A

Includes paint

21
Q

Supplementary protective

A

Temporary
Eg PX24

22
Q

Iron and steel corrosion what do you see

A

Red rust deposits

23
Q

What do you see with Aluminium and magnesium alloys corrosion

A

White to grey powdery deposits (magnesium is fluffy)

24
Q

Most common
Surface corrosion

A

Sea air
Exhaust gases
Funnel smoke

25
Q

Pitting corrosion

A

Local damage
Contamination
Surface protection is damaged
Fault
Thermal procedure changes

26
Q

Intergranular corrosion

A

Very little to no external indication

27
Q

Stress corrosion

A

Cause cracks

28
Q

Fatigue corrosion

A

Cyclic stress from external load
Cracks

29
Q

Fretting corrosion

A

Two heavily loaded materials run together
Removes natural protection

30
Q

Crevice corrosion

A

High ratio of cathode to anode area
Collects dust and moisture

31
Q

Filiform corrosion

A

Starts at fasteners
Under the paint
Not very visible
Damage is shallow and not very dangerous

32
Q

Exfoliation or layer corrosion

A

Causes lifting of the metal surface
Extensive damage can occur

33
Q

Electrochemical corrosion

A

Most usual type
Electrolytic effect
Two materials which touch liquid
Zinc copper

34
Q

Husbandry procedures

A

Keep aircraft clean
Keep aircraft dry
Maintain protective coatings

35
Q

Erosion

A

Loss of material from aircraft components by small particles such as grit, sand, stones, ice and water

36
Q

How can you reduce erosion

A

Use of tape, anti-erosion paints suitable operation procedures

37
Q

High temperature environments

A

Desert
Arid salt
Hot humid

38
Q

Consequences of corrosion

A

Reduction in static strength
Stress corrosion cracking
Shortening of fatigue life

39
Q

What are the two Corrosion removal processes

A

Mechanical

Chemical

40
Q

Pre treatment for corrosion

A

Clean the surface
Paint again
Don’t leave it to long cause clean surface could deteriorate again

41
Q

Removal of acid

A

Solution of 10% by weight
Sodium bicarbonate

42
Q

PH level

A

Between 5-9

43
Q

Removal of alkali

A

5% by weight
Solution of chromic acid

44
Q

Removal of micro organisms

A

Deposits removed with bristle brush
Cleaned with hot water 50*C

Hand Tools (12 decks)

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