6.4 - Corrosion

Question 1

What colour is steel corrosion?

Answer 1

Red

Question 2

What colour is aluminium corrosion?

Answer 2

White-grey

Question 3

What colour is magnesium corrosion?

Answer 3

Grey

Question 4

What is filiform corrosion?

Answer 4

Worm-like corrosion

Question 5

What is stress corrosion?

Answer 5

Intergranular cracking of metal caused by stress.

Question 6

what is galvanic corrosion?

Answer 6

Dissimilar metals

1 - 17 on a scale

Question 7

What is pitting corrosion?

Answer 7

White powder appearance.

Question 8

What is intergranular corrosion?

Answer 8

Corrosion along the grain boundaries, no indication on the surface.

Question 9

What is exfoliation corrosion?

Answer 9

Advanced form of intergranular corrosion, surface is forced up by underlying corrosion.

Question 10

What is fretting corrosion?

Answer 10

Rubbing/vibration of two highly loaded surfaces that aren’t meant to be touching.

Question 11

What is microbial corrosion?

Answer 11

Corrosion caused by bacteria/fungi/mould

Question 12

What is crevice corrosion?

Answer 12

In a metal to metal joint, forms at the edge of the joint