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Module 6 > Corrosion > Flashcards

Corrosion Flashcards

1
Q

Intergrannular corrosion is often caused by

A

Improper heat treatment

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2
Q

Corrosion caused by electrolytic action is the result of

A

Contact between two unlike metals

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3
Q

Corrosion may be regarded as the destruction of metal by

A

Electrochemical action

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4
Q

Exfoliation corrosion could be referred to as

A

Layer corrosion

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5
Q

When dissimilar metals are brought together, or the same metal in different states, one metal forms the anode and the other the cathode. Which will suffer the corrosion?

A

The anode

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6
Q

In corrosion, the electrode that loses electrons is

A

Either the cathode or the anode depending upon the electrolyte

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7
Q

What is a common, ongoing cause of corrosion?

A

Spilled battery acid

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8
Q

What is stress corrosion?

A

Corrosion in an area under continuous loading

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9
Q

Electrochemical reaction is caused by the contact of

A

Moisture on the surface of an inert metal

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10
Q

Chemical attack is a direct result of

A

Cathodic and anodic changes in the material

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11
Q

Galvanic corrosion is caused by

A

The joining of 2 dissimilar metals

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12
Q

With reference to the galvanic series, the most noble of two metals in contact, will

A

Cause the less noble metal to corrode

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13
Q

Stress corrosion is associated with

A

A corrosion put in a member under stress

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14
Q

Corrosion will spread more rapidly when metals are exposed to

A

High temperatures

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15
Q

What is correct regarding chemical testing?

A

The chemical test for bronze is nitric acid which produces a white precipitate

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16
Q

All corrosion is a chemical reaction. True or false?

A

True

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17
Q

In a poorly produced repair to skin structure, where would stress corrosion start?

A

Radiate from the corner or sharp edges

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18
Q

Some metals are inherently stable. What does this suggest?

A

They strongly resist corrosion

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19
Q

The oxide film formed on the surface of the aluminium is

A

Non-porous

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20
Q

Corrosion control begins at the

A

Design stage

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21
Q

Aluminium is

A

Highly resistant to corrosion

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22
Q

When galvanic corrosion takes place, which part corrodes?

A

Anode

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23
Q

Corrosion caused by galvanic action is the result of

A

Contact between two unlike metals

24
Q

What are the signs of fretting corrosion?

A

Black powder or cocoa staining

25
Q

Black streaks from a rivet hole signify

A

Fretting

26
Q

When a steel part is welded, corrosion occurs because

A

The strip has become anodic

27
Q

Intergranular corrosion

A

May have no visual surface indication

28
Q

Jointing compound is used for what reason?

A

To prevent dissimilar metal corrosion

29
Q

The lifting of flaking of the metal at the surface due to delamination of grain boundaries caused by the pressure of corrosion is

A

Electrolysis

30
Q

The electrolytic process that forms an oxide film on the surface of the surface of aluminium alloys is known as

A

Anodising

31
Q

What is the indication of fretting corrosion on aluminium alloy

A

Black powder

32
Q

What action is taken to protect integral tanks from corrosion due to microbiological growth?

A

A biocidal additive is used in the fuel

33
Q

What type of corrosion attacks grain boundaries of aluminium alloys which are improperly or inadequately heat treated?

A

Intergranular corrosion

34
Q

One of the processes which artificially produces a film of oxide on the surface of aluminium or its alloys is commonly called

A

Anodising

35
Q

Intergranular corrosion in structural aluminium alloy parts

A

May be detected by the white, powdery deposit formed on the surface of the metal
OR
Cannot always be detecting by surface indications

36
Q

Corrosion will spread more rapidly when metals are exposed to

A

High temperatures

37
Q

Magnesium alloy components are protected by

A

A chemical process

38
Q

Corrosion at the grain boundaries is called

A

Intergranular

39
Q

Fretting corrosion occurs where

A

Two material are subject to very slight movement between the two

40
Q

Spilled Mercury on aluminium

A

Reduces the corrosion resistance after time in contact
OR
Causes rapid and severe corrosion in short time period

41
Q

The usual manufacturers anti-corrosion process to be applied to Fe aircraft parts is

A

Cadmium plating

42
Q

To check the interior of tubular members for corrosion attack

A

Ultra sonic testing or x-ray is necessary

43
Q

The form of corrosion most likely to cause stress concentration is

A

Pitting corrosion

44
Q

Lead acid battery fluid has been found to be leaking on the surface of the aircraft structure. What substance would you use to neutralise the acid?

A

Sodium bicarbonate of soda

45
Q

What colour is the corrosion found on the surface of aluminium alloys?

A

White/Grey

46
Q

Corrosion on copper is identified by

A

Green discolouration

47
Q

When examining a piece of metal through a magnifying glass, hair line cracks would indicate

A

Intergranular corrosion

48
Q

Corrosion is always completely removed

A

To permit the extent of damage to be assessed

49
Q

What is a temporary protective measure?

A

Chromating

50
Q

Spilled Mercury on aluminium causes

A

Greyish powder, fuzzy deposit or whiskery growth

51
Q

What are acceptable to use in cleaning anodised surfaces?

A

Aluminium wool, fibre bristle brush

52
Q

Which of these materials is the most anodic; magnesium, cadmium or 7075-T6 aluminium alloy

A

Magnesium

53
Q

Which of these materials is the most cathodic; 2024 aluminium alloy, zinc or stainless steel

A

Stainless steel

54
Q

Galvanic corrosion is most likely to be most rapid and severe when

A

The area of the anode is smaller an the area of the cathode
OR
The area of the cathode and the anode are similar

55
Q

What is the most cathodic; nickel, magnesium or stainless steel?

A

Stainless steel

Module 6 (14 decks)

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