NACE CIP Level 2 (2023/ 2024 Update) Exam Questions and Verified Answers
QUESTION
hot-dip galvanizing
Answer:
Process of coating iron or steel
... [Show More] with a thin zinc layer, by passing the steel through a molten bath of zinc at a temperature of around 820-860
QUESTION
The usual galvanized coating consist of three distinct iron-zinc compounds
Answer:
Gamma (75% zinc & 25% iron)
Delta (90% zinc & 10% iron)
Zeta (94% zinc & 6% iron)
Eta(outer layer) (100% zinc / not considered separate layer)
QUESTION
A few safety issues the inspector should know when working around hot dip galvanizing are
Answer:
Hot dipped articles stay hot and to make sure the article is cool before touching it
Molten metal can splash out of the kettle and travel some distance
Nascent hydrogen may burn off in the air above the kettle
QUESTION
List the several major stages of the hot dip process
Answer:
Surface preparation
Fluxing
Dipping
Post treatments
Inspection
QUESTION
Explain the purpose of both caustic cleaning and acid pickling
Answer:
Caustic cleaning- the steel is immersed in caustic solution to remove the dirt, oil, and grease from the surface of the steel
Pickling- the process where the item being prepared is immersed in a tank filled with either hydrochloric or sulphuric acid, which removes oxides and mill scale
QUESTION
Galvanizing kettle operating temp
Answer:
820-860
QUESTION
List some of the common problems which may be noted during the visual inspections of hot dip galvanized items
Answer:
Articles in contact
Rough coatings
Excess aluminum
Dross protrusion
Lumpiness and runs
Uneven drainage
Flux inclusions
Ash inclusions
Dull-gray galvanized coating
Rust stains
Wet storage stains
QUESTION
Faying surfaces
Answer:
Surfaces that depend on friction to hold the structural elements in place should not be hot dip galvanized, because this treatment greatly reduces the possible coefficient of friction between surfaces
QUESTION
What are the different methods of thermal spray application?
Answer:
Flame spraying
Arc spraying
Plasma spraying
High velocity oxyfuel
QUESTION
What is the definition of coating survey?
Answer:
A coating survey is a task performed in an organized, rational manner on assets (bridge, oil rig, chemical plant, refinery, paper mill, etc) that have been previously painted / coated to gather information on the performance of the installed protective coating system.
QUESTION
Lost some of the primary reasons surveys are performed
Answer:
Aid in planning future maintenance
Work prioritization
Budgetary purposes
Aid in determining assets value
Legal compliance
QUESTION
Outline step in the process for performing a simple coating survey
Answer:
Have a clear understanding of the scope
Gather the team
Develop a survey plan [Show Less]