Degradation
Metals
Degradation is how materials fail
Ceramics
Polymers
Galvanic Corrosion
Only ones to corrode
Crevice Corrosion
Pitting Corrosion
Intergranular Corrosion
Selective Leeching
Erosion Corrosion
Stress Corrosion
Fatigue Corrosion
Two large surfaces of dissimilar metals are in contact and rub
One material, inside nooks and crannies, STAGNANT material
Gravity pulls scratches and dents down. ONLY ONE MATERIAL
Grain boundaries corrode
Zn leaves, now copper wants to oxidize and corrode
Fluid degrades material
Water wearing down rocks
Constant Stress applied (either compression or tension) and causes corrosion
Repetitive stress
Preventing corrosion
Passivating oxide
cathodic protection
Sacrificial Cathode that is a different metal
Putting a layer of the metal oxidised on top of the same metal, so that way it cannot oxidise anymore
Erosion (from mechanical brittleness)
can use as the sacrificial cathode
Swelling
radiation
Bond Cleavage
Breaks bonds
it takes water in, and it degrades by breaking the polymer network
caused by hydrolysis, oxidation and catalytic cleavage