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Mod 6 > Corrosion > Flashcards

Corrosion Flashcards

1
Q

What is corrosion?

A

When a metal returns to a metal compound such as an oxide.

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2
Q

What corrodes more easily, noble or active metals?

A

Active

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3
Q

How can corrosion damage be reduced?

A

By using corrosion resistant metals finishes

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4
Q

How are some aluminium alloys protected from corrosion?

A

Anodising and primed

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5
Q

How can steel and metals such as brass be protected from corrosion?

A

Sacrificial plating such as cadmium.

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6
Q

How can magnesium alloys be protected from corrosion?

A

Special chemical
Electrochemical
Paint finishes

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7
Q

What is electrochemical action, and it’s alternate name?

A

Corrosion cased by dissimilar metals in an electrolyte.

Also called galvanic corrosion.

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8
Q

What can cause microbial corrosion?

A

Microbes such as fungi, bacteria, and moulds

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9
Q

What is stress corrosion?

A

Intergranular cracking caused by a combination of stress and corrosion

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10
Q

What does steel corrosion look like?

A

Dark deposits then rusting if moisture is present.

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11
Q

How does corrosion affect aluminium?

A

A white gray powder is left behind

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12
Q

How does aluminium react with mercury?

A

Rapid and severe corrosion of the aluminium

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13
Q

How does corrosion affect magnesium?

A

Grey powder with severe pitting

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14
Q

How is copper affected by corrosion?

A

Green powdery product

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15
Q

What can affect corrosion on metals?

A 
Temperature
Type of metal
How dissimilar metal are
Presence of electrolytes
Oxygen available
Microbes
Exposure time
Heat treatment
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16
Q

How is Filiform corrosion identified?

A

Worm like traces been the paint film

17
Q

When can filiform corrosion happen?

A

On metals with an organic coating system, starting at the breaches
70-80% humidity with acidic surface

18
Q

What can happen if filiform corrosion is not dealt with?

A

Intergranular corrosion

19
Q

How can filiform corrosion be removed?

A

Glass bead blasting
Sanding
Portable abrasive equipment

20
Q

What are some environments that stress corrosion cracking?

A

Salt solutions and sea water for steels and aluminium

Magnesium alloys in moist air

21
Q

How does shot peening affect metals?

A

Increases resistance to stress corrosion

22
Q

What is pitting corrosion?

A

Starts with white powdery deposits on the surface, then extends vertically into the materially

23
Q

What is intergranular corrosion?

A

Attack on the grain structure with no warning.

Can lead to delamination of the material

24
Q

What is exfoliation corrosion?

A

Similar to intergranular corrosion, but lifts the metal through the expansion of the corrosive products

25
Q

What is fretting corrosion?

A

Caused by two highly loaded surfaces rubbing together, causes severe pitting and abrasive wear
Looks like Black rings around fasteners

26
Q

What is crevice corrosion?

A

A form of concentration cell corrosion in metal to metal joins
Can be avoided with sealing and adhesive joins

Mod 6 (8 decks)

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