651 Test Questions

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Corrosion of steel structures is a(n)

Abrading process

Electrochemical Process (correct)

Rare occurance

Uniform Process

In order for a corrosion cell to occur, there must be areas with different:

Crystalline structures

electric potentials (correct)

hardness

materials

Which of the following is not a component of a corrosion cell?

Anode

Electrode (correct)

Metallic path

Cathode

In a corrosion cell, where does the corrosion occur?

Anode Signup and view all the answers

In a corrosion cell, where does the corrosion not occur?

Cathode Signup and view all the answers

Moist soil under a tank floor is what part of a corrosion cell?

Electrolyte Signup and view all the answers

What is a common electrolyte on the inside of the tank?

Water and sludge Signup and view all the answers

How does uniform corrosion occur?

Thousands of microscopic corrosion cells Signup and view all the answers

When corrosion cells are larger, the type of degradation that can occur is:

pitting Signup and view all the answers

When a tank floor is in contact with a piece of clay, what causes soil side corrosion

between the clay and the floor, the oxygen concentration is lower than in other parts of the sand pad Signup and view all the answers

What causes the electrical potential for galvanic corrosion

Different metals Signup and view all the answers

Internal corrosion of a tank in hydrocarbon service is normally the result of

water and sediment Signup and view all the answers

as soil resistivity increases, the:

the likelihood for corrosion decreases Signup and view all the answers

Clean sand should be used in the pad. washing sand with municipal water may not be acceptable because of:

chlorides in the water Signup and view all the answers

the corrosion rate of the tank floor increases when the soil pH is

less than 5.0 Signup and view all the answers

Pitting corrosion on steel begins to occur when the chloride levels reach:

10 ppm Signup and view all the answers

Which of the following is an advantage of a galvanic CP system

maintenance costs are minimal Signup and view all the answers

The effectiveness of a CP system should be checked with cathodic protections surveys that are performed every:

year Signup and view all the answers