M7.18 Flashcards
What is cold light?
Artificial light without heat or electrical sparking
What type of magnifying glass is used for viewing inside structures?
8x magnification and with it own light source
What are the four enteral groups of damage?
- mechanical action
- chemical action
- thermal action
- inherent metallic properties
What is allowable damage?
Damage which is slight or of little significance
What is non-allowable damage?
Damage that must be repaired
What is non-repairable damage?
Where it is beyond repair and must be replaced
What is abrasion by hand suitable for?
Light areas of corrosion
What types of wire brushes should you use to remove heavy corrosion?
Stainless steel or aluminium oxide-coated
What types of metals can you not use grinders on?
Aluminium alloys
What strength of magnifier should you use to check if the corrosion is gone?
X10 magnifier
What are phosphate coatings used on?
Steel parts
What classifies as a paint finish?
Anything manually painted or sprayed on components
What is the two reasons paint is used?
A pleasant finish and protection
When would you not use FCR (filiform corrosion resistant) primer?
When humidity is higher than 75% or the temperature is below 15.C
What is the pot life time of an intermediate primer?
6 hours at 18-22.C
What is the pot life of an epoxy primer?
4 hours
What is the cure time for an epoxy primer?
24 hours at 18.C
What is the cure time for AV100?
6 hours
What are the four types of sealing?
- absolute
- extensive
- intermediate
- limited
What are fillets used for?
Maximum protection from fluid leakage
When apply smothers how much filler should you use?
Always more than you need so you can remove some to create the smoothness
What must you remember when using a sealant cap?
To leave some sealant on top and around the bottom
What are most sealants known chemically as?
Polysulfides
What are the two types of sealing compound?
Silicone and non-silicone
