Chapter 9 - Corrosion | Forms of corrosion

Question 1

What are the three groups of metal corrosion?

Answer 1

– wet corrosion
– dry corrosion
– corrosion in other fluids such as fused salts and molten metals

Question 2

What forms of wet corrosion are there?

Answer 2

• Galvanic corrosion
• Crevice corrosion
• Pitting corrosion
• Intergranular corrosion
• Stress corrosion cracking

Question 3

What is Galvanic corrosion?

Answer 3

This is the corrosion of a more active metal when connected to a more noble metal from the galvanic series

Question 4

What is Crevice corrosion?

Answer 4

This results from a difference in dissolved O2 between the area inside the crevice and the area outside the crevice.

Question 5

What is Pitting corrosion?

Answer 5

preferential attack that occurs at breaks

in the natural oxide layer on passive metals

Question 6

What is intergranular corrosion?

Answer 6

when grain boundaries are

more susceptible to corrosion compared to the bulk grain

Question 7

What is stress corrosion cracking?

Answer 7

accelerated corrosion, localized

at cracks in tensile loaded components