NACE CIP 2 Master Study Guide.
Two primary types of cathodic protection
Correct Answer:
- Galvanic 2. Impressed current
Describe cathodic protection
Correct Answer:
Reducing or eliminating corrosion by turning the protected structure into a cathode by an impressed current or attachment to a galvanic anode
Describe galvanic corrosion
Correct Answer:
Electrochemical reaction of two dissimilar metals in contact with the presence of an electrolyte, and an electron conductive path. Reactive metal will corodoe to protect the noble metal
Two broad categories of corrosion?
Correct Answer:
- General 2. Localized
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How do pollutants and gases affect corrosion?
Correct Answer:
They directly chemically attack the substrate and reduce the electrical resistance of the electrolyte
How does humidity affect corrosion?
Correct Answer:
A more humid environment will accelerate corrosion
How do chemical salts affect corrosion?
Correct Answer:
They increase the rate of corrosion by increasing the electrolyte efficiency
How does temperature affect corrosion?
Correct Answer:
- Corrosion reaction increases with temp. increase 2. Corrosion reactions are
electrochemical in nature
How does oxygen affect corrosion?
Correct Answer:
Increases corrosion rates as oxygen contact areas are cathodic
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Describe passivation
Correct Answer:
The production of a tightly adhered layer formed from the corrosion product
Standard of Engineering Society description of a standard
Correct Answer:
A document that applies to codes, specs or practices, classifications, test methods and guides which have been prepared and published in accordance with established procedures
Properties of concrete
Correct Answer:
- Inorganic 2. Hard 3. Good compressive strength 4. Improve with age
Three NACE standards and classifications. Name and define them.
Correct Answer:
Standard practice: Details of construction, methods of treating required to reduce corrosion. Test methods: Ascertain characteristics of material design and operation.Materials requirement: State necessary characteristics when corrosion is a factor in the selection application or maintenance of a material.
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NSB
Correct Answer:
National Standards Body
SDO
Correct Answer:
Standards Development Organization
Difference in sacking and stoning
Correct Answer:
Sacking uses a cement sack or rubber sponge for application and stoning uses a carborendum brick or abrasive block
Advantages of watersetting and wet abrasive blasting
Correct Answer:
- Quickly cuts surface 2. Washes dust away 3. Reduces abrasive and concrete particles
in air
What is the joint NACE #6/SSPC-SP 13 blast standard for surface prep of concrete?
Correct Answer:
Requirements for surface prep by mechanical, chemical or thermal means
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