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Coatings And Corrosion Prevention > Study Questions > Flashcards

Study Questions Flashcards

1
Q

Define corrosion.

A

Environmentally induced deterioration.

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2
Q

What is passivation?

A

The formation of a corrosion byproduct, such as oxide, chloride, carbonate, sulfate, etc., that can retardation further corrosion.

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3
Q

Describe what happens at the anode.

A

The anode is the part of the metal that actually corrodes, or dissolves into the electrolyte.

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4
Q

What is the function of the electrolyte?

A

Allows the movement of ions between the anode and the cathode. It allows anions to be attracted to the anode, and cations to the cathode. This creates the conditions for oxidation and reduction.

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5
Q

What is the function of the metallic pathway?

A

Allows the electrons generated at the anode to move to the cathode.

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6
Q

How does NACE define the role of the inspector?

A

A Quality Control Technician, primarily responsible for observing and reporting on coating application projects, and the degree of conformity the contractor is able to achieve.

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7
Q

What is the inspectors role when it comes to safety?

A

Enforcement of safety rules is not the responsibility of the inspector, but the inspector is required to know and obey safety requirements.

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8
Q

Name some tests that may need to be conducted during surface preparation of coating operations.

A

Atmospheric, equipment and mixing processes should be noted.

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9
Q

Name some of documents and reports that may be required to be maintained on a coatings project.

A

Materials inventory reports (detailing the types and quantities of all on-hand materials, batch numbers, and delivery and usage dates) Instrument calibration reports Daily and weekly reports Inspection log to provide a clearer view of all inspection activity

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10
Q

What are the most important characteristics of a good report?

A

Consistent with client expectations

Regular and accurate

Objective and professional

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11
Q

What is the inspectors primary responsibility, and what should the inspector not do as it pertains to the specification?

A

Be a useful team member Observe and document Not do: supervise and direct the operations

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12
Q

What type of information should you expect on a product data sheet?

A

Answers product questions.

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13
Q

What kind of information should you expect to find on the Material Safety Data Sheet?

A

The MSDS provides data on all the known substances within a product: Toxicity Health effects First aid Reactivity with other substances Proper disposal PPE requirements Spill handling

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14
Q

Explain the difference between Quality Control and Quality Assurance.

A

Quality control: control the quality of a product during production Quality Assurance: assures that a product is not defective after production

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15
Q

Types of soluble salt contamination include:

A

Chlorides, suflates and nitrates. (Soluble salts are not very soluble, and cannot be removed with a simple wash.)

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16
Q

If inspection is to be effective with regards to salts, the specification must clearly state:

A

Acceptable limits of soluble salts, The specific salts to be limited on the substrate, the specific test methods to use, the exact testing frequency, precisely where to administer the tests

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17
Q

tests for soluble salts include:

A

potassium ferricynide testing bresle patch testing sleeve testing

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18
Q

depth of surface profile can be evaluated by several methods:

A

ISO Comparators - works like a paint color patch Replica tape - a foam tape that is crushed against the blasted surface Digital profile gauge - measures peak to valley distances

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19
Q

The ISO comparator grades may be recorded:

A

Finer than fine - fine - medium - coarse - coarser than coarse

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20
Q

The two types of replica tape that are commonly used:

A

Replica tape measures the surface profile after blasting. The two most common types are coarse and extra coarse.

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21
Q

List the standards for using replica tape:

A

NACE Standard RP0287 and ASTM D4417 Method D

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22
Q

When using replica tape, common errors include:

A

Insufficient sampling, poor surface preparation, poor gauge accuracy, rubbing technique

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23
Q

Identify some of the defects that can be caused by incorrect application temperatures

A

Blistering, pin holing, cratering, dry spray, and Mud Cracking

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24
Q

Describe relative humidity

A

a comparison between the amount of actual airborne moisture, and the maximum possible moisture saturation within a given temperature range

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25
Q

what is the dew point temperature?

A

Dew point is the temperature at which the airborne moisture begins to return to a liquid state

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26
Q

Name some of the effects that wind can have on a coatings project.

A

blow abrasive blast debris into the coating application area, cause drift and overspray, uneven evaporation of solvents after application, and contribute to dry spray.

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27
Q

What are some of the common errors when using and electronic hygrometer?

A

taking readings in direct sunlight, leaving the instrument in place too long, removing the instrument before the readings stabilize

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28
Q

explain how to use a sling psychrometer

A

insert into a specialized wet sock, whirl the instrument for 40 seconds, read the wet bulb temperature, repeat until rhe wet bulb temperature remains the same from reading to reading, compare this reading to the dry bulb reading

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29
Q

Faying surfaces

A

Surfaces joined to create a friction grip

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30
Q

Gouges

A

Sharp indentations in the coating

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31
Q

Inclusions

A

A non metallic phase in a metal

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32
Q

Organic solvents

A

Solvents such as kerosene, turpentine, xylol, etc., that clean the metal by dissolving and diluting the grease contamination on the surface.

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33
Q

Surface cleanliness should be inspected (at a minimum) during these three junctures:

A

Before surface preparation begins

after surface preparation is comlete, and before any coating is applied

between each coating layer (in multi layer projects)

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34
Q

Factors in surface preparation that may affect service life include:

A

Oil and grease residue (prevents bonding with surface)

non-visible chemical salts residue (can create corrosion)

Rust on surface (adhesion failures)

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35
Q

Common design defects include:

A

Hard to reach or innaccesible areas

Rivets, bolts, other connectors

Welds

Gaps

Overlapping surfaces

Angle iron that is badly oriented or in complex arrangements

Threaded areas

Dissimilar metals

Sharp edges, corners, rough cut plate

Construction aids

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36
Q

Common fabrication defects include:

A

poor lamination

imperfect welds - weld spatter, skip welds, rough welds

gouges

sharp corners and edges

sharp bends or angles

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37
Q

Four typical SSPC-SP1 precleaning methods include:

A

Solvent wipe with cloth

immersion of the substrate in solvent

solvent spray

vapor degreasing

steam cleaning

emulsion cleaning

chemical paint stripping

alkaline cleaners

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38
Q

One standard to use with power tool cleaning is:

A

SSPC-SP 3

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39
Q

Four examples of power tools used for cleaning are:

A

rotary wire brush

Impact tools, such as chipping or scaling hammers (can damage the surface)

needle scaler (needle guns)

Rotary scalers

piston scalers

grinders and scalers

Disc sanders

vaccum connections

(Just need to know four)

40
Q

Two abrasive blast methods are

A

Centrifugal blasting

sand injected water blast

slurry blast

dry grit blast (air blasting)

wet abrasive blast

41
Q

Visual standards for abrasive blasting include

A

Visual SSPC-VIS 1

42
Q

SSPC-SP10/NACE 2 limits staining to ? per each unit area.

A

5%

43
Q

SSPC-SP 5/NACE 1 limits staing to ? per unit area.

A

none

44
Q

SSPC-SP 6/NACE 3 limits staining to ? per each unit area.

A

33%

45
Q

The two types of abrasive blasting nozzles include:

A

Venturi Nozzles

Straight Bore

46
Q

Advantages of cenrifugal blast equipment include:

A

lower production costs

automated

very high rates of cleaning

47
Q

The two broad classifications of curing mechanisms are

A

Nonconvertible and convertible

nonconvertible coatings cure by evaporating the solvent, and can be redissolved in the original solvent

Convertible coatings cure by polymerization. They are “convertible” because they convert into a new substance when they cure

48
Q

List two nonconvertible coating types

A

Vinyl

Chlorinated rubber

49
Q

List three convertible coating curing mechanisms

A

Oxidation - react with ozygen after the somvent evaporates

Co-Reaction - occurs when various compounds react to one another (and must be mixed)

Hydration - require some amount of water to cure

Fusion - forced heat curing

50
Q

List two characteristics of oxidation cure coatings

A

Cannot be submerged

susceptible to excessive film build up

51
Q

list three coating types that cure by polymerization

A

Epoxies

Polyurithanes

Polyureas

52
Q

What is “induction time?”

A

the period of time after mixing, but before the coating can be applied

53
Q

What is the main requirement for a hydration coating to cure?

A

water must be present

54
Q

Industrial and marine coatings are commonly referred to by:

A
55
Q

Adhesion Failures may be caused by:

A

Coating applied to a contaminated surface

Improperly prepared surface

Insufficient surface profile

Application of incompatible coatings

56
Q

Checking can be described as:

A

Line cracks in the topcoat

57
Q

non-drying films (failure to cure) may be caused by:

A

not adding cure to the base

adding the wrong cure

not adding the correct amount of cure during mixing

58
Q

Some of the problems that can be caused by amine blush are:

A

surface tackiness

incomplete cure

poor adhesion

coating discoloration

(amine blush is caused by environmental conditions, such as rapid drops in temperature, cold weather or high humidity.)

59
Q

Runs, sags and wrinkles may be caused by:

A

applying the coating too thickly

improper use of thinner

applying on a surface that is too hot

60
Q

A powdery layer on the surface of a coating that is most common with epoxy coatings is:

A

Chalking

(caused by environmental radiation)

61
Q

Cratering may be caused by:

A

Improper mixing can leave air bubble inclusions in the coating

62
Q

vacuoles or voids are typically caused by:

A

mixers being run too fast

(vacuoles are caused by air bubbles in the coating. If theyburst, they are craters.)

63
Q

Pinholes are:

A

Very small holes that appear in the coating

(caused by air or solvent escaping)

64
Q

A common cause of blistering:

A

Some kind of contaminant, like

oil

moisture

grease

dirt

65
Q

Cracking of a coating is noted:

A

by visual examination

66
Q

Low temperature concerns during coating application include:

A

low temps may slow the curing process

67
Q

High temperature concerns during coating application include:

A

solvents evaporating oo quickly

pot life of the coating may decrease

viscosity of two component materials may be affected

68
Q

High humidity during coating application may:

A

Slow the evaporation rate of solvents, causing the coating to cure improperly

69
Q

Coating may be applied using the following methods:

A

brush

roller

spray

airless spray

70
Q

Goals of a pre job conference include:

A

Health and safety requirements

reporting requirements

responsibilities of the inspector

71
Q

List three important properties of a coating:

A

Water resistance

ease of application

cohesive strength

72
Q

Two broad coating classifications of a coating are:

A

Either

organic and inorganic

or

Convertible and nonconvertible

73
Q

What are two primary components of a liquid applied coating?

A

Binders and solvents

(binders provide the functional properties of a coating. Some examples of binders are epoxy, polyurithane, alkyd, and acrylic. Solvents are used to liquify the binders. Other important components of liquid coatings are pigments and additives.)

74
Q

Describe three methods by which a coating provides corrosion controll:

A

Barrier resisitance

inhibition: can prevent corrosion cells from forming, even if they do not completely prevent all contact with the environment

Sacrificial Anode

75
Q

What are the three different ways a coating can adhere to the surface?

A

Chemical

mechanical

polar

(The most effective method is chemical bond, like galvanizing molten zinc to the surface. This melts the surface of the steel, making the coating a functional part of the surface.)

76
Q

Non drying films (failure to cure) could be caused by:

A

The cure: not adding to the BASE IN THE FIRST PLACE, ADDING THE WRONG CURE, OR messing it up

The manufacturer may have sent the wrong cure

environmental factors: excessive humidity. Extreme temperatures can affect curing

Incorrect or contaminated thinner

77
Q

General types of holiday detectors include:

A

High or low voltage DC detectors

high voltage pulsed DC

High voltage AC detectors

78
Q

Low voltage (wet sponge) holiday detectors are powered by a battery with output voltages ranging:

A

5v-120v DC

79
Q

Describe the low voltage (wet sponge) holiday detectors

A

non-conductive handle

electrified sponge

ground cable

80
Q

High-voltage DC holiday detector types include:

A

Pulse type DC detectors

Constant Current detectors

81
Q

Describe high voltage holiday detectors

A

portable

hand held

attached electrode (may resemble a steel brush or a spring coil that wraps around a pipline

82
Q

The type of high voltage holiday detector that is used for concrete is:

A

High voltage Pulse-type DC detectors

83
Q

What is a standard?

A

an industry guide that helps to establish norms and standardization within the industry

tends to cover:

  • technical criteria
  • methods
84
Q

What percentage of NACE standards relate to coatings?

A

about 50% of NACE International standards are related to protective coatings

85
Q
A
86
Q

The inspectors checklist for surface preparation should include

A

ambient conditions

condition of substrate

fabrication defects

preblast surface cleanliness

shot/grit selection

shot/grit cleanliness

equipment

surface profile

surface cleanliness after blasting

operator qualifications

safety

87
Q

Abrasive media types include:

A

cast steel

(removes scaleand other hard surface deposits)

steel grit

(irregular shapes, cuts away surface deposits and imperfections. Expensive)

Steel shot

(balls of steel, can drive impurities into the surface)

Crushed Slag

(fast cutting)

Ceramic Grit

(Expensive, very good cutting)

Silica Sand

(Cheap, can leave dust)

Garnet

Agricultural abrasives

Speciality abrasives

(Dry Ice, Ice, Plastic Beads, baking soda, Sponge)

88
Q

List the pressure ranges that catagorize Low pressure water cleaning:

A

below 5000 psi

(this is considered a “rinse”)

89
Q

List the pressure ranges that catagorize High pressure Water cleaning:

A

Not used very often.

5,000 - 10,000 psi

90
Q

What are the pressure ranges for High-pressure waterjetting?

A

10,000 - 30,000 psi

91
Q

What are the pressure ranges for Ultrahigh-pressure waterjetting?

A

Pressures above 30,000 psi

92
Q

Three types of waterblasting include:

A

Grit blasting with a shroud

sand injected water blast

slurry blast with grit / water mix

93
Q

The NACE - SSPC waterjetting standard is:

A

NACE - VIS 4

94
Q

Three test methods for surface profile include:

A

comparator and coupons

Replica tape

dial gauge micrometer

95
Q

Inspectors checklist summary

A

inspect equipment and materials to be used

pre-inspect the substrate

inspect during and after pre-cleaning process

perform specified tests to refrenced standards

accept or reject prepared substrate

inspect and accept prepared substrate

document the process

96
Q

surface lamination

A

the most common surface defect on steel surfaces

caused by rolling the steel

97
Q
A

Coatings And Corrosion Prevention (2 decks)

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