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Airframe Repairs > Materials And Corrosion > Flashcards

Materials And Corrosion Flashcards

1
Q

What two categories are metals and alloys divided into?

A

Ferrous & Non Ferrous

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2
Q

What 3 metal standards do we use?

A

British Standards (BSI)
French Standards (AFNOR)
American Standards (SAE)

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3
Q

What materials do not need a certificate of conformity?

A

Materials supplied by the federal military stock, underwritten by the department of defence national quality assurance authority.

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4
Q

What is used as a rapid means of material identification?

A

Colour coding

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5
Q

What does annealing do?

A

Changes the metal into a very soft and malleable state

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6
Q

What does heat treatment do?

A

Changes the metal into a soft condition, but not as soft as when annealed.

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7
Q

What does refrigeration storage do to a metal?

A

slows down the natural age process, remain in heat treated or quenched condition for longer

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8
Q

What is artificial age treatment?

A

Precipitation treatment, artificially heated to get the maximum strength of an alloy

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9
Q

What is the natural age process?

A

Room temperature natural process, starts immediately when cooled

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10
Q

What does aluminium and magnesium alloy corrosion look like?

A

White to grey powdery deposits

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11
Q

What does iron and steel corrosion look like?

A

Red rust

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12
Q

Define Corrosion

A

Corrosion is the tendency of a metal to revert to its thermodynamically more stable oxidised state

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13
Q

Whats surface corrosion?

A

Direct reaction of a metal surface with oxygen, or unpainted metal contact with the following:

Sea-air
Aircraft exhaust gases
Funnel smoke

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14
Q

What is stress corrosion?

A

Cracks occurring on stressed parts of the aircraft in a corrosive environment

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15
Q

What is fatigue corrosion?

A

Cyclic stresses from an external load

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16
Q

Whats fretting corrosion?

A

Two surfaces, one of which metal rubbing together causes the natural protection to wear away. These particles oxidise and become abrasive which form areas of corrosion

17
Q

Whats crevice corrosion?

A

High ratio of cathode to anode area involved due to oxygen concentration between inside and outside the crevice

18
Q

Whats filiform corrosion?

A

Corrosion starting at fasteners and extends beneath protective paints which may not be visible until it has become severe. Shallow and not structurally dangerous.

19
Q

Whats exfoliation or layer corrosion?

A

When corrosion occurs at layers parallel and beneath the surface which wedges and lifts the surface.

20
Q

Whats dissimilar metal corrosion (electrochemical/galvanic)?

A

When there is a difference in galvanic potential between two metals in contact, the metal of lower potential forms the anode and is oxidised or corroded.

21
Q

Define erosion

A

The loss of material from components by the action of small particles such as grit, sand, stones, ice and water.

22
Q

What are the 3 high temperature environments aircraft are subjected to?

A

Desert Regions

Arid Salt Laden

Hot & Humid

23
Q

What are the 3 main consequences of corrosion?

A

Reduction in static strength

Stress corrosion cracking

Shortening of fatigue life

24
Q

Whats the essential requirements when removing corrosion?

A

Remove all corrosion
Leave surface smooth
Leave surface uncontaminated
Do not blend material into a crack
Do not cause metallurgical or thermal damage to surface
Do not exceed any metal removal limits

25
Q

What are the two different methods of corrosion removal?

A

Mechanical and chemical

26
Q

Depending on wether a metal is supplied to a British, American or French standard, how will its thickness be measured?

A

British - Standard Wire Gauge
American - thousandth of an inch
French - mm

27
Q

What can you do to slow down the natural age hardening process?

A

Refrigeration

28
Q

What is the most significant form of environmental damage?

A

Corrosion

29
Q

What type of corrosion is caused by cyclic stress from an external load?

A

Fatigue

30
Q

Which method of corrosion removal is used on magnesium alloy?

A

Phosphoric

31
Q

What would you use and in what ratio to neutralise an acid spillage?

A

An aqueous solution of 10% by weight

32
Q

What would you use and in what ratio to neutralise an alkali spillage?

A

Chromic acid 5% by weight

33
Q

What PH should cleaning water be?

A

Between 5 and 9

34
Q

When should acid and alkali spillages be re-examined?

A

At weekly intervals

Airframe Repairs (8 decks)

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