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Mod 6 > 6.4 > Flashcards

6.4 Flashcards

1
Q

What two actions causes corrosion?

A

Chemical or electrochemical

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2
Q

What is erosion?

A

Destruction by a mechanical action

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3
Q

Why does corrosion occur?

A

Because the metals are trying to return to there natural state

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4
Q

What is a noble metal?

A

When a metal is chemically pure (i.e gold and platinum)

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5
Q

What goes through an anoxic change?

A

The metal that is being attacked

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6
Q

What goes through an cathodic change?

A

The corrosive agent

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7
Q

What is a passive film on a metal?

A

When the metal itself produces an invisible oxide film to protect itself from corrosion

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8
Q

What metals are said to be corrosion resistant?

A

Aluminium and pure titanium

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9
Q

What is electrochemical action also known as?

A

Galvanic action

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10
Q

What is needed for galvanic corrosion to take place?

A

Two dissimilar metals and an electrolyte

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11
Q

What is microbiological corrosion?

A

Corrosion caused from bacteria, fungi, moulds

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12
Q

What is stress corrosion?

A

Intergranular cracking of the metal

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13
Q

What colour is rust when formed from steel and iron?

A

Dark colours (i.e red and brown)

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14
Q

What colour is corrosion when formed on aluminium?

A

White

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15
Q

What is the worst metal to put with aluminium?

A

Mercury

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16
Q

What colour is rust from magnesium?

A

Grey

17
Q

What colour is rust from copper?

A

Green

18
Q

How are copper wires on aircraft protected?

A

Plating with tin or nickel

19
Q

What is electrolytic corrosion?

A

When an external source of current is applied

20
Q

When does electrolytic corrosion normally take place?

A

When a battery leaks

21
Q

In the galvanic scale what is a metal known as if it is moat corrosive?

A

Anodic

22
Q

In the galvanic scale what is a metal known as if it is less corrosive?

A

Cathodic

23
Q

What is the most common type of corrosion?

A

Pitting corrosion

24
Q

What is exfoliation corrosion?

A

When the surface is lifted by corrosion in the grain boundary (like delamination)

25
Q

What is fretting corrosion?

A

When two objects rub together when designed not to

26
Q

What is aerobic bacteria?

A

Requires oxygen to live

27
Q

What is meant by anaerobic bacteria?

A

When oxygen is not needed

28
Q

What is fungi?

A

Micro-organisms that feed on organic materials

Mod 6 (17 decks)

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