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NACE CIP1 > Chapter 12-13 > Flashcards

Chapter 12-13 Flashcards

1
Q

Steps of receiving coating materials “(3)

A
  1. Visual inspection
  2. Verify the order
  3. document”
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2
Q

Storing coating materials (3)

A

“1. temp requirements - high temp can reduce shelf life, effect quality, effect flash points
2. safety regulations - flammable material have complex storage requirements
3. efficiency - keep area neat and tidy”

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3
Q
  1. pot life
A

“length of time after mixing the coating remains usable and can be correctly applied
time and temperature dependent
high temp = reduce pot life
low temp = increase pot life
(epoxy /poly = have pot life)”

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4
Q
  1. induction time
A

“length of time that must elapse after mixing, aka sweat in or stand in time
high temp = reduce induction time
low temp = increase induction time”

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5
Q
  1. viscoity
A

“too high = flow slowly, film thickness uneven = high temp
too low = too thin ,drips, and runs = low temp
resistance to flow”

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6
Q
  1. shelf life FIFO
A
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7
Q
  1. Mixing -
A

pigments can separate from the resin and solvent and settle at the bottom of the container.

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8
Q

mixing and thinning coat type (2)

A

“1. Single
2. Multi “

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9
Q

inspector roles prior to mixing (4)

A

“1. confirm the coating material and thinner match pds and specs
2. check the top of the containers are clean
3. examine the coating for any skin on the surface for sign of degradation
4. measure that environmental condition are within the specified range listed on the PDS”

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10
Q

inspector role during mixing (3)

A
  1. mixed thoroughly
  2. ensure new material is nevered added on top of previously mixing material
  3. within pot life “
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11
Q

Describe the role documentation as it related to inspecting the mixing and thinning of a coating (6)

A
  1. ambient conditions
  2. method and equipment used to agiitate
  3. pot life
  4. induction time
  5. coating temp
  6. time mixed”
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12
Q

useful pot life =

A

potlife - induction time

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13
Q

mixing zinc-rich primers (4)

A

“requires extreme care when mixing
mixed continously agitated to keep the zinc in suspension
mesh screen / strianer used to remove lump zinc
mix liquid then add zinc slowly”

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14
Q

Measure coating temperature after

A

coating is mixed and strained (avoid using a non contact thermometer)

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15
Q

thinning “verify

A

appropriate thinner is used, the amount, and if it is allowed by the PDS
thinning affect VOC, WFT and performance characteristics
thinning takes place AFTER induction time

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16
Q

under thinning =

A

non uniform film with pin holes / poor appearances

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17
Q

over thining =

A

too thin, runs , DFT too thin”

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18
Q

strainning

A

“after coating is mixed good practice to strain
bag strainner
screen mesh “

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19
Q

mixing partial kit is

A

NOT recommended

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20
Q

individual components are mixed together first before putting together use

A

air pneumatic tool

21
Q

Manual Application equipment “

A

1.Burshes - best for unever surfaces, touchup repairs, and for stripe coating
2. Rollers - good for large, smooth flat areas, that do not require smooth finish. Disadvantage - incorrect nap thickness, film defciencies, wet edge issue, orange peel

”

22
Q

Spray Application equipment

A

“1. Airless Spray - atomization is through high pressure that forces coating through a small hole
2. Convention Spray - Atomization is through a stream of compressed air
2-5x faster than roller/brush”

23
Q

Conventional Spray System (air atomized)

A

“Advantage - Produces a uniform, finer finish and higher quality, operator control , air atomized
Disadvantage - lower production rate , lower transfer efficency, may require thinning, improper setup or operations.
Good for inorganic zinc coatings, where as high pressure airless sytem can cause zinc powder to separate out from the liquid”

24
Q

HVLP Sray Systems (Specialty)

A

Uses a high volume of air at low pressure to propel the coating on the substrate
Advantage - 2x as efficient as conventional spray due to low pressure used, Used mostly for VOCs are a concern
Disadvantage - lower production rate than conventional”

25
Q

Airless Spray system

A

thicker dry film thickness needed
ideal for viscous/high solids/high build coating such as zinc based coatings and epoxies
Advantage - highest production rate , 2x-4x application rate of other system, high transfer efficiency, less overspray ,less waste, can atomize viscous coatings
Disadvantage -fixed spray pattern , less operator control over atomization, hazardous spray”

26
Q

Conventional Spray System Equipments (7)

A

“1. Compressor
2. Oil and Water Trap
3. Air hose
4. Regulators - controls the amount of compressed air and coating material that reaches the gun
5. Pressure Pot - stores and pressurizes the coating material
6. Fluid Hose
7. Pressure Fed Spray Gun”

27
Q

Airless spray equipment (5)

A

“1. High pressure , dual action piston pump
2. Compressor
3. Container (non pressurized)
4. Airless Spray Gun and Tip
5. High pressure Hose”

28
Q

Air-Assisted Airless Spray System

A

hybrid airless/convention system, operates at lower pressure than airless but results in higher efficiency and less overspray. Lower pressure = higher transfer efficiency

29
Q

Plural Component Spray system controls the mix ration, uses heat to reduce viscosity versus thinner , utilized for

A
  1. 2 components
  2. have short pot life
  3. high solids by volume content
  4. highly viscous
    Disadvantage - expensive , not suitable for coating that require an induction time”
30
Q

Conventional Spray System troubleshoot

A

“1. insufficent pressure - poor atmoization 2. Contaminated Air - damages equipment and contaminates surfaces 3. Overspray 4. Incorrect equipment set-up 5. Overthining”

31
Q

Airless Spray Systems troubleshoot

A

“1. Poor atomization 2. Incorrect or damage spray tips 3. Insufficient Pressure”

32
Q

stripe coating

A

extra coat of paint to edges, welds, fasteners, corners before or after a full coat is applied

33
Q

SSPC-PA Guide 11

A

have more info on stripe coating

34
Q

highest production rate

A

airless spray system

35
Q

conventional spray system pros

A

fine atomization/good operator control/uniform high quality finish

36
Q

HLVP

A

high transfer efficiency, environmental friendly

37
Q

improper atomization causes

A

“1. uneven DFT
2. Dry Spray
3. Overspray
4. failure to cure”

38
Q

inpsector during coating application (5)

A

“1. verifying that the substrates is clean, dry and free of contaminants
2. verifying that a stripe coat has been applied
3. informing the applicator supervisor when the gun is not atomizing correctly
4. monitoring the ambient conditions
5. ponting out discontinuities in the film finish the contractor or supervising party”

39
Q

high temp concerns

A

“solvent evaporate too fast
reduce pot life
lower viscosity”

40
Q

low temp concerns
“

A

“slow curing
high viscosity

41
Q

strip coat type

A

“1. By spray application-spray then go back to stripe
2. Complex structures - stripe coat is applied after the primer or intermediate coat “

42
Q

convential spray pressure

A

50-75 psi

43
Q

HVLP pressure

A

less that 10 psi

44
Q

used when regulation require low VOC emissions but has the lowest production rate

A

HVLP

45
Q

Features high production rates and TE along with increased operator control with less overspray s

A

air assisted

46
Q

can apply hihgly viscous coating with very short pot life

A

plural

47
Q

allows for greater control of the flow rate and spray pattern and is air atomized, producing high quality finish

A

conventional

48
Q

atomization occurs by hihg pressure and has highest product rate but less fine finish

A

air less

NACE CIP1 (8 decks)

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