Coatings

Question 1

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

Answer 1

No

Question 2

How do you determine the WFT through math?

Answer 2

DFT divided by %solids= WFT

Question 3

What is polymerization?

Answer 3

When 2 chemicals react to make a coating film.

Question 4

Most coatings are named due to their what?

Answer 4

Their resin.

Question 5

Which coating has excellent resistance to sulfuric acid?

Answer 5

Phenolic coatings

Question 6

Should rubber be overcoated by convertible coatings?

Answer 6

Nope!

Question 7

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

Answer 7

Nope!

Question 8

What is a common failure in VINYL coatings?

Answer 8

Solvent blistering

Question 9

Do ACRYLIC coatings have a good resistance to UV?

Answer 9

Yes

Question 10

What is a common failure for ACRYLIC coatings?

Answer 10

Incomplete cure

Question 11

Do BITUMINOUS coatings have good UV resistance?

Answer 11

No

Question 12

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

Answer 12

ALKYDS

Question 13

Which coatings should only be used as a primer?

Answer 13

Zinc coatings

Question 14

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

Answer 14

Incomplete/failure to cure

Question 15

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

Answer 15

Incomplete cure because of LOW HUMIDITY

Question 16

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

Answer 16

INORGANIC ZINC

Question 17

INORGANIC ZINCs are usually applied at what mils?

Answer 17

.75 mils

Question 18

ALKYDS react with what to cure?

Answer 18

Oxygen

Question 19

How do EPOXYESTER coatings cure?

Answer 19

Oxidation

Question 20

Most marine coatings are ORGANIC or INORGANIC?

Answer 20

Organic

Question 21

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

Answer 21

ALKYDS

Question 22

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

Answer 22

Neoprene

Question 23

What is an INTUMESCENT coating?

Answer 23

Fireproof coating

Builds thicker layer with heat

Question 24

What are the 3 basic coating types?

by how they fight corrosion

Answer 24

Barrier
Inhibitive
Sacrificial

Question 25

2 examples of oil-based coatings are what?

Answer 25

ALKYDS & EPOXY

Question 26

What is coalescence cure?

Answer 26

When oxygen is evaporated and THEN chemically fuses the film.

Question 27

What are the 4 components of a coating?

Answer 27

Pigment Additive Binder Solvent

Question 28

Describe ALKYD coatings?

Answer 28

``` Oxidation cure Slow to cure Used on US navy ships Oil-based Single packaged ```

Question 29

Describe EPOXY coatings.

Answer 29

``` 2 component Good adhesion Chemical resistance Water resistance Susceptible to chalking ```

Question 30

Describe ALIPHATIC POLYURETHANES.

Answer 30

High UV resistance Excellent gloss Used for exterior coating

Question 31

Describe AROMATIC POLYURETHANES.

Answer 31

Tough Great chemical resistance Chalks in sunlight

Question 32

Which types of cures are convertible?

Answer 32

Oxidation Coreaction Hydration Fusion

Question 33

Explain POLYURETHANE coatings.

Answer 33

2 component Aliphatic & Aromatic

Question 34

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

Answer 34

Oil-based

Question 35

What percentage of zinc is in a zinc rich coating?

Answer 35

75%-95%

Question 36

How long does powder coating take to cure?

Answer 36

3 minutes

Question 37

True or false? | 2 component epoxies need environmental readings through the curing process.

Answer 37

True

Question 38

Which process cures rubberized linings?

Answer 38

Vulcanization

Question 39

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

Answer 39

The resin or binder

Question 40

Describe phenol coatings.

Answer 40

Organic | High resistance to chemicals

Question 41

What are the 3 types of natural rubber?

Answer 41

Soft Semi-hard Hard

Question 42

Does electrically static- applied coating have a solvent?

Answer 42

No

Question 43

What does a coating "vehicle" consist of?

Answer 43

Solvent Binder Any additive

Question 44

The coating "vehicle" is synonymous with what?

Answer 44

The coating base

Question 45

What is dryspray?

Answer 45

In conventional spray, when the pressure is too high.

Question 46

Can convertible coatings be brought back to their original state?

Answer 46

Nope

Question 47

Explain 3 things about polyureas

Answer 47

2 component flexible very short cure time

Question 48

Name the 3 test methods for soluble salt contamination

Answer 48

Potassium ferricyanide Bresel patch Sleeve test

Question 49

What percentage of premature coating failures are attributed to surface preparation

Answer 49

75%

Question 50

Do organic zinc coatings require a topcoat

Answer 50

Yes

Question 51

At what relative humidity does corrosion rate significantly decrease

Answer 51

50%

Question 52

Steel contains approximately how much iron

Answer 52

95%

Question 53

What is the "driving force" in the corrosion process

Answer 53

The potential difference

Question 54

The anode corrodes in the form of what

Answer 54

Positively charged ions

Question 55

The method a tape test is for what thicknesses

Answer 55

Anything over 5 mills

Question 56

how fast is the reaction time for polyureas?

Answer 56

As little as 9 seconds

Question 57

Are polyaspartic coatings high VOC?

Answer 57

No

Question 58

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

Answer 58

Heat

Question 59

What is solvency power?

Answer 59

The ability to dissolve the resin

Question 60

What is volatility?

Answer 60

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

Question 61

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

Answer 61

Inhibitive coatings