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NACE CIP 2 – Questions & Expert Verified Answers
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NACE CIP 2 – Questions & Expert Verified Answers
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NACE CIP 2 – Questions & Expert Verified AnswersDescribe passivation Right Ans - Passivation is the formation of a
protective oxide Film on the surface reducing its chemical activity and its
ability to corrode
Describe the following factors and how they affect corrosion Right Ans -
Oxygen: oxygen increases the rate of corrosion temperature
Temperature: corrosion usually accelerated with increasing temperature
Chemical salts: increase the rate of corrosion by increasing the efficiency of
the electrolyte
humidity: the wetter the environment, the more corrosion is likely to occur
pollutants and acid gases: all promote corrosion
Two broad categories of corrosion can be described as Right Ans - General
and localized
Describe galvanic corrosion Right Ans - Galvanic corrosion is an
electrochemical action of two dissimilar metals in the presence of an
electrolyte and an electron conductive path, Which occurs when the dissimilar
metals come into contact
Describe cathodic protection Right Ans - Cathodic protection is the
reduction or elimination of corrosion by making the structure to be protected
a cathode by means of impressed current or attachment to a galvanic anode
The two primary types of cathodic protection are Right Ans - Impressed
current and galvanic (sacrificial)
impressed current power sources include: Right Ans - 1. Generators 2. Fuel
cells 3. Wind powered cells 4. Thermoelectric cells 5. Rectified commercial
power 6. Solar Cells
Describe cathodic disbondment Right Ans - The separation of the coating
from the surface through hydroxyl formation due to increased ( made more
negative ) potential.
Describe dehumidification Right Ans - Dehumidification is the process of
removing moisture vapor from the air to lower its dew point
,When planning enclosures the following minimum requirements should be
considered Right Ans - Must be large enough to contain the whole work
area.
Not be larger than the performance capabilities of the dehumidification
equipment.
Be sturdy enough to hold up to intended work activities, potential loads, and a
possible inclement weather.
Have minimal leakage to maintain proper environmental conditions and
ensure the dehumidification system operates efficiently.
Describe air turns (air changes) Right Ans - The air turnover principal
illuminates air stratification, or layering, in large open spaces by recirculating
the hot air that becomes trapped in the higher spaces.
The number of times it does this per hour is called air turns.
At & below what relative humidity does corrosion virtually cease Right Ans
- 40%
Describe two ways to reduce the relative humidity of the boundary layer
Right Ans - Increase the surface temperature and reduce moisture content by
dehumidification
Types of dehumidification equipment include Right Ans - Refrigeration and
desiccant
Describe several benefits of dehumidification Right Ans - Dries the air.
Lowers the dew point. Permits blasting the entire surface. Holds the blast with
dry air. Helps in cleaning the surface. Holds the surface during coating
application.
Electronic hygrometers can be used to determine Right Ans - Relative
humidity, air temperature, and dewpoint temperature.
Advanced environmental testing instruments have the ability to store data
that can be transferred to a computer and other devices. Transfer methods
include Right Ans - USB, IR, Bluetooth
, Some general basic centrifugal blast set ups include Right Ans - Tumbling
mill, multitable, plain table, swing table, custom designed systems
Centrifugal blasting conveyor systems are commonly used for cleaning
Right Ans - Plate, rolled structural shapes, large trusses, girders
Portable centrifugal blasting systems can be used on Right Ans - Ship
decks, hull sides, and bottoms. Storage tanks. Concrete floors. Highways and
bridge decks.
Generally centrifugal blast systems are composed of the following elements
Right Ans - Centrifugal abrasive throwing wheel, the blast cabinet, in fixed
systems some type of material handling system, abrasive recycling system, a
dust collector and vent pipe system, abrasives.
The efficiency of the centrifugal blast wheels depends on several factors
Right Ans - Abrasive operating mix, size of the abrasive, velocity of the
abrasive coming off the wheel, quantity and direction of the thrown abrasive,
condition of the feed parts.
Little amperage readings on a centrifugal blasting machine could signify
Right Ans - An abrasive starved wheel, a flooded or choked wheel
The functions of the centrifugal blasting machine separator include Right
Ans - To control the sizing of the abrasive mix, to remove sand, spent
abrasives, rust, dirt, and any other contaminants from the abrasive stream, to
control abrasive consumption
A well balanced operating mix (working mix) of abrasives will Right Ans -
Provide consistency of the finish, ensure uniform abrasive coverage, ensure
conditioning of the abrasive for optimum cleaning, minimize lowest abrasive
and machine part where and reduce downtime for maintenance
Some of the inspection concerns during centrifugal blasting include Right
Ans - Monitor the dust collector, monitor the amperage of the wheel motors /
low amperage, Monitor the handling in the loading of the conveyor line for
contaminants and possible discontinuities in the steel, monitor the speed of
wine, inspect the steel as it leaves the production line
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