Chapter 8 Flashcards
1
Q
causes of metal corrosion
A
- marine
- chemicals
- other pollutants
2
Q
methods of corrosion protection
A
- galvanising
- spray/paint
- hot dip galvanising
3
Q
hot dip galvanising
A
coating the surface of the steel with a corrosion-resistant metal
4
Q
surface preparation
A
rust, scale, oil and other surface contaminants are carefully removed from steelworks by pickling in dilute sulfuric acid
5
Q
fluxing
A
flux dissolves and absorbs any remaining impurities, moisture or oxide film on the metal surface and ensures that clean steel contacts the molten zinc the moment it enters the bath
6
Q
galvanising process
A
- preparation
- degreasing
- pickling
- rinsing
- pre-flux
- galvanising bath
- quenching
- finishing
7
Q
anticorrosion paint and coating success factors
A
- sustainability
- surface preparation
- film thickness applied
8
Q
inspection and testing of galvanised coatings
A
pick out superficial defects and provide information about faults in the process
9
Q
recommendations for coating steel surface
A
- abrasive blast new steel
- treat with a soluble or insoluble salt remover
- use organic zinc-rich primer
