2-2D Corrosion Exam Actual
Questions and Answers 2026
corrosion T.O -
correct answer ✅1-1-691
Spread of Deteriation -
correct answer ✅Presence of dissimilar metals, availability of
oxygen, Temperature and exposure to environment, type of metal,
heat treatment of metal
Pitting(localized) -
correct answer ✅most common type of corrosion on aluminum or
magnesium alloys first appears as white or grey powdery deposit,
when the deposit is removed tiny pinholes appear
galvanic -
correct answer ✅-Results from electrical currents flowing from
one metal to the other
-A build-up of corrosion between the contacting points of dissimilar
metals
moisture is required for this type of corrosion to occur
stress(cracking) -
correct answer ✅form of galvanic
, 2-2D Corrosion Exam Actual
Questions and Answers 2026
metal fatigue below its rated strength due to excesive loads and
corrosion
identified by NDI
exfoliation -
correct answer ✅advanced form of intergranular
Identified by lifting or swelling of metal surface
Intergranular(severe type) -
correct answer ✅Attacks metal grain boundaries
detected by using non-destructive inspection(NDI)
Uniform Etch(most common type) -
correct answer ✅Also known as general corrosion
-usually occurs on polished surfaces
-initially appears as general dulling or etching of the surface,
becomes rough and frosted in advances stages
-Caused by direct chemical attack on unprotected surfaces
Questions and Answers 2026
corrosion T.O -
correct answer ✅1-1-691
Spread of Deteriation -
correct answer ✅Presence of dissimilar metals, availability of
oxygen, Temperature and exposure to environment, type of metal,
heat treatment of metal
Pitting(localized) -
correct answer ✅most common type of corrosion on aluminum or
magnesium alloys first appears as white or grey powdery deposit,
when the deposit is removed tiny pinholes appear
galvanic -
correct answer ✅-Results from electrical currents flowing from
one metal to the other
-A build-up of corrosion between the contacting points of dissimilar
metals
moisture is required for this type of corrosion to occur
stress(cracking) -
correct answer ✅form of galvanic
, 2-2D Corrosion Exam Actual
Questions and Answers 2026
metal fatigue below its rated strength due to excesive loads and
corrosion
identified by NDI
exfoliation -
correct answer ✅advanced form of intergranular
Identified by lifting or swelling of metal surface
Intergranular(severe type) -
correct answer ✅Attacks metal grain boundaries
detected by using non-destructive inspection(NDI)
Uniform Etch(most common type) -
correct answer ✅Also known as general corrosion
-usually occurs on polished surfaces
-initially appears as general dulling or etching of the surface,
becomes rough and frosted in advances stages
-Caused by direct chemical attack on unprotected surfaces
