success/ failure

Question 1

what are the 6 possible sites that adhesive/ cohesive failure can occur at

Answer 1

adhesive failure:
1) porcelain metal interface if no oxide layer is present
2) metal oxide - metal interface
3) porcelain-metal oxide interface

cohesive failure
1) throuhg porcelain (desirable but idk why)
2) through metal oxide layer
3) through metal (but metal fracture is highly unlikely)