What info should be included when sending samples to a lab? - CORRECT ANSWER-
1. Identity of materials 2. Properly packed/labeled samples 3. Chain of custody form 4.
Type of analysis that is expected and the concentrations of interest
Specialized tests or equipment coating inspectors may encounter - CORRECT
ANSWER-1. AA/AE Atomic Absorption/Emission 2. ISP Induction coupled plasma
Spectrometer 3. GLC Gas liquid chromatographs 4. IR, FTIR, FTIR-ATR INfrared
spectrophotometers 5. DSC Differential scanning calorimeters
What is a cathodic dis-bondment test? - CORRECT ANSWER-Procedure to determine
how easily a coating loosens from a substrate or develops holidays as a result of normal
soil potentials
Individuals who perform surveys - CORRECT ANSWER-1. O-Cat or S-cat tech 2.
NACE coating specialist 3. NACE Level III 4. Coating Inspector w/field experience 5.
Coating manufacturer representative 6. Maintenence engineer with specific plant
knowledge.
Coating survey steps - CORRECT ANSWER-1. Understand scope 2. Gather team 3.
Develop survey plan 4. Review standards 5. Agree on format 6. Delegate various tasks
7. Eveluate existing coating 8. Delegate various tasks 9. Evaluate existing coating 10.
Gather additional info 11. Summarize data 12. Prepare maintenance plans 13. Prepare
reports/input data 14. Submit final survey reports.
List some of the primary reasons surveys are performed - CORRECT ANSWER-1. Plan
maintenance. 2. Prioritize work 3. Budgetary concerns 4. Determine value of assets 5.
Legal compliance
Definition of a coating survey - CORRECT ANSWER-Gather baseline info needed to
plan maintenance coating procedures
What are faying surfaces and why not galvanize them? - CORRECT ANSWER-
Surfaces that depend on friction to hold galvanizing it may/will reduce friction if they are
galvanized
What is the cause of chalking in epoxy coating - CORRECT ANSWER-UV or radiation
exposure
What is polymerization cured coating? - CORRECT ANSWER-Two parts mixed
together just prior to use
, Examples of non-convertible coatings - CORRECT ANSWER-1. Chlorinated rubber 2.
Vinyl 3. Acrylic 4. Bituminous
Non-convertible curing def. - CORRECT ANSWER-No chemical change during cure
cycle
Convertible curing def. - CORRECT ANSWER-Some chemical change during cure
cycle
Common problems seen during the usual inspections of HD galvanized items -
CORRECT ANSWER-1. Cracking 2. Peeling 3. Bare spots 4. Lumps 5. Blisters 6. Flux
inclusions 7. Ash inclusions 8. Dross inclusions
Post galvanizing treatments and why - CORRECT ANSWER-To Remove Thickness:
Roll, Wipe, Centrifuge/Air Blast
To change properties/To alloy: Annealing
Temperature range for galvanizing kettle - CORRECT ANSWER-820-850 F
Purpose of pickling - CORRECT ANSWER-Hydrochloric or sulfuric acid bath to remove
oxides and mill scale
Purpose of caustic cleaning - CORRECT ANSWER-Acid bath or caustic to remove dirt,
oil and grease
Stages of hot dip process - CORRECT ANSWER-1. Surface prep. 2. Galvanizing 3.
Post treatment 4. Inspection
Hot dip galvanizing safety - CORRECT ANSWER-1. Can stay for some time 2. Molten
metal splash 3. Nascent hydrogen above kettle
Usual layers of galvanized coating consists of: - CORRECT ANSWER-1. ETA=100% Zn
2. ZETA= 94% Zn 6%Fe 3. DELTA= 90% Zn 10 Fe 4. GAMMA= 75% Zn 25% Fe
What is hot dip galvanizing? - CORRECT ANSWER-Coating iron or steel with zinc at
temperatures of 820-860 F
If a maintenance coating to be applied is incompatible with the existing coating
system__________may occur - CORRECT ANSWER-Curling
______________ is performed at the work area by working the edges of the repaired
area back to achieve a fairly smooth transition from the repair area to sound coating. -
CORRECT ANSWER-Feathering