Shared Flashcard Set

Details

SSPC Applicator Training 1
000
12
Science
Professional
03/20/2013

Additional Science Flashcards

 


 

Cards

Term
Why do metals corrode?
Definition
Iron and steel combine with other chemical elements to return to their lower energy states. Moisture, salts, and certain temperatures speed up the corrosion.
Term
Name 3 of the 5 types of corrosion
Definition
Uniform
Galvanic
Pitting
Crevice
Stray
Term
Define galvanic corrosion
Definition
Galvanic corrosion is a quick form of corrosion that occurs when two very different metals are in close contact.
Term
When does crevice corrosion occur?
Definition
It occurs when there is less oxygen available inside the crevice than is outside of it, especially if the crevice is wet.
Term
When does stray current corrosion occur?
Definition
It occurs when there is an electrical current flowing near a structure that is buried underground or placed under water or in another liquid.
Term
What is the best way to prevent current corrosion?
Definition
Use cathodic protection.
Term
List 3 of the 5 methods of preventing and controling corrosion.
Definition
Protective coatings
Cathodic protection
Good design
Materials selection
Change of environment
Term
What are the two main types of protective coatings?
Definition
Organic
Metallic
Term
What are the three steps to prepare a surface to be painted?
Definition
Pre-Cleaning
Cleaning
Post-Cleaning
Term
List some things that you need to do during the pre-cleaning of a surface
Definition
Identify and repair defects
Remove grease, oil, salts water, loose chalking, etc.
Term
List some thing that you need to do during the cleaning stage to prepare a surface
Definition
Refer to the job contract or specifications to see how clean the item needs to be. It will generally include removing rust and mill scale in order to create a surface profile.
Term
List some things that you need to do during the post-cleaning stage to prepare a surface
Definition
Identify and correct defects
Make sure the surface is dry, free of contaminants, and that the level of cleanliness still meets the required cleanliness level specified in the contract.
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