Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

M6 > M6.4 Corrosion > Flashcards

M6.4 Corrosion Flashcards

1
Q

What is corrosion?

A

Metal is oxidised, forms salts and oxides

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Why does corrosion form?

A

Difference in electrode potentials when in contact with electrolyte

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What are the 3 requirements for corrosion to form?

A

. Electrical potential difference
. Conductive path
. Electrolyte covering areas

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

How can you prevent corrosion?

A

. Dry and clean surface
. Cleanliness

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is a passive film?

A

Invisible oxide layer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What corrosion will occur in grains?

A

. Intergranular
. Pitting

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Describe galvanic corrosion

A

. 2 dissimilar metals
. Further apart on scale are more reactive

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is electrolytic corrosion?

A

Electrolyte and current through 2 metals

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What’s the difference between galvanic and electrolytic corrosion?

A

Galvanic - interaction between 2 metals
Electrolytic - cause by external source of current

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is microbiological corrosion?

A

. Bacteria, fungi, mould
. Aircraft fuel tanks

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What’s are the 2 bacteria categories?

A

Anaerobic, aerobic

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is stress corrosion and what’s it formed by?

A

. SCC
. Unexpected failure
. Tensile or cycled loading
. Dye penetrate inspecting

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is filiform corrosion?

A

. Oxygen concentrated
. On coatings
. Worms

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is pitting corrosion?

A

. Holes in materials

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is inter-granular corrosion?

A

. Cracking
. Allow other corrosions to enter
. Use films to prevent

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is exfoliation corrosion?

A

. Advanced of intergranular
. Go down grains

17
Q

What’s fretting corrosion?

A

. Occurs due to vibration
. Rubbing removes protective films
. Use lube to prevent

18
Q

What is crevice corrosion?

A

. Enter through nut edges
. Sealing

19
Q

What is mercury corrosion?

A

. Chemical reactions
. Attacks grain boundary

20
Q

What do noble metals have resistance to?

A

Surface attacks

21
Q

Explain dry corrosion

A

. Lacks moisture
. Dry conditions
. Slow process

22
Q

What’s wet corrosion?

A

. Humidity over 60%
. Moisture presence

M6 (10 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions