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Fundamentals of Protective Coatings - C1 Flashcards

1
Q

Which metal would never be used in sacrificial anodes for cathodic protection of steel?

A

Platinum

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2
Q

Which surface preparation method is used to create a surface profile?

A

Abrasive blasting

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3
Q

What is the minimum level of surface cleanliness required when applying an inorganic zinc rich coating?

A

SSPC-SP 3

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4
Q

What is the purpose of the lockout/tagout procedure?

A

To prevent injury to personnel from equipment

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5
Q

Why is it best not to overmix a coating before application?

A

To minimize entrapment of air bubbles in the coating

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6
Q

On which steel surface would a 3-coat silicone alkyd system be most appropriate?

A

Exterior of a water tank in a mild environment

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7
Q

Which item below can best be used to determine if chalking of a coating is too great for good topcoat adhesion?

A

A dark felt cloth

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8
Q

What chemical action takes place at the anode during corrosion?

A

Loss of metal

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9
Q

Which invisible contaminant can affect coating performance if not removed by cleaning of the steel before coating application?

A

Soluble Salts

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10
Q

Prior to coating application, the substrate and ambient temperatures must be:

A

At least 5° above the dew point and not falling

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11
Q

Which is true of a venturi nozzle as compared to a straight-bore nozzle used for abrasive blast cleaning?

A

It provides a more uniform blast pattern

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12
Q

In which coating application method can the overspray be collected and recycled?

A

Powder spray

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13
Q

Which coating provides a type of cathodic protection to steel?

A

Zinc-rich coatings

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14
Q

Which coating would perform best on the interior of a storage tank for aviation fuel?

A

Epoxy polyamide

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15
Q

Which U.S. organization addresses industrial hazards to personnel at job sites?

A

OSHA

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16
Q

Which pair of ingredients comprises a coating’s vehicle?

A

Binder and solvent

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17
Q

Which coating system can be used to repair the bottom of a deteriorated steel tank used for storing chemicals?

A

Fiberglass-reinforced vinyl ester

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18
Q

Theoretical spreading rate is defined as:

A

The spreading rate with 0% loss of material

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19
Q

Why is a stripe coat a vital part of the coating process?

A

It allows the applicator to cover edges/welds and other hard to reach places prior to and after topcoating

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20
Q

When a coating’s viscosity increases, what happens to the consistency of the material?

A

The material becomes thicker

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21
Q

Define mill scale.

A

An iron oxide film formed during hot-rolling of steel

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22
Q

Which instrument can best be used to determine the ambient dew point?

A

Psychrometer

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23
Q

Define pot life.

A

Period of time after mixing of components during which a coating can successfully be applied

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24
Q

At which location are you most likely to find an oxygen deficiency?

A

In tanks and other confined spaces

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25
Define bleeding in coatings:
Color migration from underlying substrate or coating through new coating
26
Which statement is always true about corrosion?
Anodic and cathodic areas are required
27
What coating defect is commonly associated with solvent entrapment?
Blistering
28
Why would a calcium chloride test be used on a concrete floor that is to be coated?
To measure the rate of moisture migration through the concrete
29
What type of bristle is best when applying solvent-based coatings by brush?
Natural/China bristle
30
For which service are coal tar coatings most appropriate
Underground fuel pipe exterior
31
Which is a safety device for airless spraying?
A trigger lock
32
What is the most common cause of osmotic blistering of coatings on cleaned steel surfaces?
Soluble salt contamination on the steel surface
33
What is the most common mechanism of corrosion control by coatings?
Barrier protection
34
Why do exterior coatings chalk?
Deterioration of binder by sunlight
35
Why is it important to detect defects in coatings early when they are being applied?
Corrective action is easier and less costly then
36
Which coating is most susceptible to mudcracking when applied too thickly?
Inorganic zinc-rich
37
What is a written, legal document, usually part of a contract, which precisely describes an item of work that is to be accomplished?
Specification
38
What destructive instrument may best be used for measuring dry film thickness of a coating on a concrete surface?
Tooke gage
39
Why are pre-construction primers most often spray applied in a shop?
To minimize the necessary field abrasive blasting
40
To which pipe areas are heat-shrink sleeves typically applied?
Welded areas
41
Which material may be used to control the corrosion of steel reinforcing bars in concrete?
Epoxy powder coatings
42
How does micaceous iron oxide pigment in coatings provide corrosion protection to steel?
By reducing ultraviolet light deterioration of coatings
43
Why is it necessary to apply a sealer to concrete?
To reduce the porosity
44
What surface defect is associated with two components epoxies, caused by contact with moisture during the curing process?
Amine blush
45
Which is true of metallizing?
The metallizing is usually sealed for longer service
46
Which coating application method has the greatest production rate?
Airless spray
47
Which item can best be used to determine profile height of an abrasive blasted steel surface?
Deformable replica tape
48
Which substrate is best prepared per SSPC-SP 16?
Aluminum
49
Which cleaning method best removes soluble salts from contaminated surfaces?
Waterjetting
50
Which abrasive is a natural mineral product?
Garnet
51
Which surface preparation standard defines power tool cleaning?
SSPC-SP 3
52
Which SSPC surface preparation standard requires a stated minimum surface profile?
SSPC-SP 11
53
Which coating requires straining to remove clumps?
Inorganic zinc-rich
54
Define laitance.
A loose layer of cement on concrete
55
Which description best defines outgassing associated with concrete?
Air that is expelled from concrete porosity during rise in temperature
56
Define induction time:
Period of time after mixing of components and before application to permit reaction of components to proceed
57
Which is a non-destructive instrument for measuring dry film thicknesses of coatings on concrete surfaces?
Ultrasonic gage
58
Which coating is the most tolerant to outdoor exposure?
Waterborne acrylic
59
Which coating has good resistance to the sun's ultraviolet light?
Aliphatic polyurethane
60
What is the most important advantage of plural component coating application systems over other coating spray systems?
Very short pot-life materials may be applied
61
Which term best describes a fiberglass-reinforced polyester product?
A composite
62
Why are oil-based coatings incompatible with concrete?
Concrete has a high alkalinity
63
What defect occurs when an applied coating insufficiently covers the profile on a steel substrate?
Pinpoint Rusting
64
What is the chief advantage of HVLP spray equipment over other coating spray systems?
Higher transfer efficiency
65
Which of the following application defects could be the result of excessive coating thickness?
Mudcracking
66
Which document defines standard surface profiles for concrete surfaces?
ICRI No. 310.2
67
What is a significant advantage of petroleum or wax and tape coatings for steel piping as compared to other coating systems?
Lower surface cleaning requirements
68
What test can best be used to determine if a thermosetting coating has fully cured?
Solvent-rub test
69
When spraying protective coatings, what is the term used to describe when the gun isn't held parallel to the applied substrate?
Arcing
70
Why is a blotter test used in abrasive blasting operations?
To detect oil or water in compressed air
71
Which visual reference can best be used to assist in determining the level of cleanliness of abrasive blasted steel surfaces?
SSPC-VIS 1
72
Which instrument is best used to determine if a blast nozzle has eroded away to a larger size?
Wedge-shaped probe
73
Thermal spray is a form of:
Galvanic protection
74
What is a limitation of ultrahigh-pressure waterjetting of new steel?
It does not produce a profile
75
What inspection tool is used at the beginning of coating application to determine if the thickness is on target to match specification requirements?
WFT gage
76
Why do most free metals corrode?
They are in a chemically unstable state
77
What tool is used to measure wet film thickness?
A gage with notches of different lengths
78
What is a limitation of conventional air spray as compared to airless spray of coatings?
It has a lower application rate
79
Which pair of organizations certifies approval for linings for potable (drinking) water storage tanks?
ANSI/NSF
80
Which surface preparation standard is used to remove all visible surface contaminants?
SSPC-SP 1
81
What is an advantage of coatings as opposed to other methods of corrosion control?
It may impart an attractive appearance
82
Which statement is true for impressed current cathodic protection of underground steel piping?
External power is required
83
Why are cartridge respirators test fitted?
To ensure that air entering the respirator passes through the cartridge
84
Which document explains the methods for providing extra corrosion protection measures on edges, outside corners, crevices, and welds?
SSPC-PA Guide 11
85
Which statement is true about galvanic protection?
The metal becomes the cathode
86
Which coating would be expected to perform the best in seawater immersion?
Epoxy polyamide
87
What will occur from inadequate coating opacity?
Incomplete hiding of substrate
88
Who is responsible for the safety plan on coating jobs?
The contractor
89
What is the cause of brush marks and orange peeling on coating surfaces?
Inadequate leveling of the wet film
90
What is the most common cause of pinpoint rusting?
Too high a surface profile for the coating
91
Which tool can best be used to indicate the strength or soundness of a concrete slab?
Rebound hammer
92
Which structural configuration is most commonly associated with concentration cell (e.g., oxygen) corrosion?
Crevices
93
Which is a safety requirement for scaffolds used in painting operations?
Toe boards and rails
94
Which is a safety device for abrasive blast cleaning?
A deadman valve
95
What information is necessary to calculate the theoretical spreading rate of a coating?
The total solids by volume in the coating
96
Define recoat window:
Period of time after application during which a coating can be successfully topcoated
97
Which coating defect is most likely to occur if a vinyl lacquer is applied over a bituminous coating?
Bleeding
98
Why have restrictions been placed on the VOC content of coatings?
VOCs react in air to form ozone and other air pollutants
99
Which coating type is most likely to encounter wrinkling problems?
Alkyd
100
How is zinc most commonly applied to the steel used on highway guards for corrosion protection?
Dipping cleaned steel in a bath of molten zinc
101
What is the minimal surface preparation level for inorganic zinc?
SSPC- SP 10
102
Where are coal tar epoxy systems used?
Mostly used in tank linings, underground piping, and piling.
103
Inorganic zinc-rich systems have __________ high-temperature resistance.
Good

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