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NACE > Coatings > Flashcards

Coatings Flashcards

1
Q

Is there a chemical change to the resins in a non-convertible coating?

A

No

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2
Q

How do you determine the WFT through math?

A

DFT divided by %solids= WFT

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3
Q

What is polymerization?

A

When 2 chemicals react to make a coating film.

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4
Q

Most coatings are named due to their what?

A

Their resin.

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5
Q

Which coating has excellent resistance to sulfuric acid?

A

Phenolic coatings

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6
Q

Should rubber be overcoated by convertible coatings?

A

Nope!

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7
Q

Should a convertible coating go on top of a solvent-effected coating?

A

Nope!

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8
Q

What is a common failure in VINYL coatings?

A

Solvent blistering

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9
Q

Do ACRYLIC coatings have a good resistance to UV?

A

Yes

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10
Q

What is a common failure for ACRYLIC coatings?

A

Incomplete cure

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11
Q

Do BITUMINOUS coatings have good UV resistance?

A

No

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12
Q

Which coating type commonly fails due to applying it too quickly?

A

ALKYDS

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13
Q

Which coatings should only be used as a primer?

A

Zinc coatings

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14
Q

What is the most common failure for POLYESTER and VINYLESTER coatings?

A

Incomplete/failure to cure

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15
Q

Moisture-cured URETHANE is prone to what type of failure?

A

Incomplete cure because of LOW HUMIDITY

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16
Q

Silicone coatings are often coated over what?… but not always.

A

INORGANIC ZINC

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17
Q

INORGANIC ZINCs are usually applied at what mils?

A

.75 mils

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18
Q

ALKYDS react with what to cure?

A

Oxygen

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19
Q

How do EPOXYESTER coatings cure?

A

Oxidation

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20
Q

Most marine coatings are ORGANIC or INORGANIC?

A

Organic

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21
Q

This coating cures by oxidation, cures slowly, and is single packaged.

A

ALKYDS

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22
Q

What type of lining has great resistance to ozone, gases, acids, and bases?

A

Neoprene

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23
Q

What is an INTUMESCENT coating?

A

Fireproof coating

Builds thicker layer with heat

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24
Q

What are the 3 basic coating types?

by how they fight corrosion

A

Barrier
Inhibitive
Sacrificial

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25
Q

2 examples of oil-based coatings are what?

A

ALKYDS & EPOXY

26
Q

What is coalescence cure?

A

When oxygen is evaporated and THEN chemically fuses the film.

27
Q

What are the 4 components of a coating?

A

Pigment
Additive
Binder
Solvent

28
Q

Describe ALKYD coatings?

A 
Oxidation cure
Slow to cure
Used on US navy ships
Oil-based
Single packaged
29
Q

Describe EPOXY coatings.

A 
2 component
Good adhesion
Chemical resistance
Water resistance
Susceptible to chalking
30
Q

Describe ALIPHATIC POLYURETHANES.

A

High UV resistance
Excellent gloss
Used for exterior coating

31
Q

Describe AROMATIC POLYURETHANES.

A

Tough
Great chemical resistance
Chalks in sunlight

32
Q

Which types of cures are convertible?

A

Oxidation
Coreaction
Hydration
Fusion

33
Q

Explain POLYURETHANE coatings.

A

2 component

Aliphatic & Aromatic

34
Q

What general type of coatings DO NOT perform well on zinc primers?

A

Oil-based

35
Q

What percentage of zinc is in a zinc rich coating?

A

75%-95%

36
Q

How long does powder coating take to cure?

A

3 minutes

37
Q

True or false?

2 component epoxies need environmental readings through the curing process.

A

True

38
Q

Which process cures rubberized linings?

A

Vulcanization

39
Q

Which individual part of a coating changes from a liquid to a solid?

A

The resin or binder

40
Q

Describe phenol coatings.

A

Organic

High resistance to chemicals

41
Q

What are the 3 types of natural rubber?

A

Soft
Semi-hard
Hard

42
Q

Does electrically static- applied coating have a solvent?

A

No

43
Q

What does a coating “vehicle” consist of?

A

Solvent
Binder
Any additive

44
Q

The coating “vehicle” is synonymous with what?

A

The coating base

45
Q

What is dryspray?

A

In conventional spray, when the pressure is too high.

46
Q

Can convertible coatings be brought back to their original state?

A

Nope

47
Q

Explain 3 things about polyureas

A

2 component
flexible
very short cure time

48
Q

Name the 3 test methods for soluble salt contamination

A

Potassium ferricyanide
Bresel patch
Sleeve test

49
Q

What percentage of premature coating failures are attributed to surface preparation

A

75%

50
Q

Do organic zinc coatings require a topcoat

A

Yes

51
Q

At what relative humidity does corrosion rate significantly decrease

A

50%

52
Q

Steel contains approximately how much iron

A

95%

53
Q

What is the “driving force” in the corrosion process

A

The potential difference

54
Q

The anode corrodes in the form of what

A

Positively charged ions

55
Q

The method a tape test is for what thicknesses

A

Anything over 5 mills

56
Q

how fast is the reaction time for polyureas?

A

As little as 9 seconds

57
Q

Are polyaspartic coatings high VOC?

A

No

58
Q

Organic coatings have less resistance to THIS in comparison to inorganic coatings.

A

Heat

59
Q

What is solvency power?

A

The ability to dissolve the resin

60
Q

What is volatility?

A

The speed at which the solvent leaves the coating film during and after application.

61
Q

Primers are always this type of coating. (Broad term)

A

Inhibitive coatings

NACE (4 decks)

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