Chapter 16 Corrosion and Degradation of Materials

Question 1

Metals and ceramics corrode

Answer 1

polymers degrade

Question 2

degradation

Answer 2

dissolving when exposed to chemical absorb solvent electromagnetic radiation (primarily ultraviolet light) heat

Question 3

oxidation

Answer 3

nonmetallic scale or film Metal atoms give up electrons M –> M^n+ + ne-

Question 4

anode

Answer 4

location where oxidation takes place

Question 5

reduction reaction

Answer 5

losing the electrons to another chemical compound (oxidation)

Question 6

cathode

Answer 6

where the reduction occurs

Question 7

oxidation consequence

Answer 7

1. metal ions into corroding solution OR 2. Form an insoluble compound (rust)

Question 8

oxidation consequence

Answer 8

1. metal ions go into corroding solution OR 2. Form an insoluble compound (rust)

Question 9

anode corrodes

Answer 9

cathode collects?

Question 10

anode corrodes - cathode collects

Answer 10

“ehn” (shove away) “catch-ode”

Question 11

standard half-cell

Answer 11

a pure metal electrode immersed in a 1M solution of its ions @25C or 77F

Question 12

emf

Answer 12

electromotive force

Question 13

reduction

Answer 13

Metal ions and electrons condensing to metal M^n+ + ne^- –> M

Question 14

Nernst Equation

Answer 14

Question 15

Corrosion penetration rate (CPR)

Answer 15

Material removal rate

formula: CPR = KW/rho At