Defects
Causes
Treatment
Corrosion
1. Thin film edges
2. Corrosion at minor collided areas
3. Acid and alkali erosion
1. Polishing
2. Conventional grinding and polishing
3. Deep grinding and finesse polishing
4. Local paint repair (serious rusted metals need to be
repaired before painting)
Paint Peeling
1. Poor adhesion between the coating and
the substrate or outer coating too hard
2. Coating too thick or erosion caused by
water vapor, acid and alkali in the air
3. Under coating treated incorrectly
4. Pinholes and defects in the outer paint
layer
1. Polishing
2. Conventional grinding and polishing
3. Deep grinding and finesse polishing
4. Local paint repair (serious rusted metals need to be
repaired before painting)
Acid Rain Erosion
1. Acid rain erosion
1. Polishing (mild erosion)
2. Conventional grinding and polishing (medium erosion)
3. Deep grinding and finesse polishing
4. Local paint repair (severe erosion)
Gloss
1. Film eroded by the acid, alkali, electric
arc, sea water and other strong
corrosive salty spray
2. Incorrect maintenance methods in harsh
conditions
3. Poor paint durability
4. Incorrect paint mixture ratio, paint
durability deterioration
1. Polishing (mild loss of light)
2. Conventional grinding and polishing (moderate loss of
light)
3. Deep grinding and finesse polishing
4. Local paint repair (severe loss of light)
Bubbling
1. Film exposed to a humid environment for
a long; water vapor infiltration into paint
film; water and gas bubbling when
temperature rises
2. Corrosion caused by infiltrated materials
3. Fuel, acid, alkali and other erosion
1. Polishing
2. Conventional grinding and polishing
3. Deep grinding and finesse polishing
4. Local paint repair (serious rusted metals need to be
repaired before painting)
12-162
Paint/Coatings
Body, Sheet Metal and Painting
EC718/EC718RV EC715/EC715RV 10/2009
Summary of Contents for EC715 2009
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