Chapter 10 Surface Preparation

Question 1

During surface preparation, surface cleanliness should be inspected ( at a minimmum) the following three times:

Answer 1

Before any surface preparation activities

After surface preparation, and before coating begins

Between each application of coating in a multi-coat system

Question 2

Factors during surface preparation that may affect service life include:

Answer 2

Residues of oil, grease, and soil

Residues of (non-visible) chemical salts

Rust on the surface interferes with adhesion

Mill Scale

Surface Condensation

Old coatings

Existing Coatings

Question 3

Common design defects include:

Answer 3

Hard to reach or inaccessible areas

Rivets, bolts, or other connectors

Welds

Gaps ( skip welds or surfaces close together )

Overlapping surfaces

Angle iron badly oriented or in complex arrangements

Threaded areas

Dissimilar metals

Sharp edges, particularly on corners or rough-cut plate

Question 4

Common fabrication defects include:

Answer 4

Weld spatter, skip welds, sharp corners & edges

Question 5

Four typical SSPC-SP1 pre-cleaning methods include:

Answer 5

Solvent wipe with cloth or rag

Immersion of the substrate in solvent

Solvent spray

Vapor degreasing

Steam cleaning

Emulsion cleaning

Chemical paint stripping

Use of alkaline cleaners

Question 6

One standard to use with power tool cleaning is:

Answer 6

SSPC-SP3

Question 7

Two examples of tools used for rotary power tool cleaning are:

Answer 7

Rotary wire brushes

Disc sanders

Question 8

Two abrasive blasting methods include

Answer 8

Centrifugal blasting
Sand-injected water blast
Slurry blast
Wet abrasive blast
Dry grit blasting

Question 9

Visual guides for abrasive blasting include:

Answer 9

SSPC-Vis 1

ISO 8501-1

Question 10

SSPC-SP10/NACE 2 limits staining ______ per each unit area

Answer 10

5%

Question 11

SSPC-SP5/NACE 1 limits staining to ______ per each unit area

Answer 11

0%

Question 12

SSPC-SP6/NACE 3 limits staining to _______ per each unit area

Answer 12

33%

Question 13

The two types of abrasive blasting nozzles include:

Answer 13

Straignt

Venturi

Question 14

The specified level of surface cleanliness must be achieved and maintained

Answer 14

Immediately prior to coatings application

Question 15

Advantages of centrifugal blast equipment include:

Answer 15

Dust and fines are contained

Abrasives are easily recycled

Blasting and priming can be an incline operation

General overall economy compared to air blasting

No compressors, piping, or air handling equipment needed for wheel blasting

Question 16

The inspector’s checklist for surface preparation should include:

Answer 16

Ambient conditions
Conditions of substrate
Pre-blast surface cleanliness
Shot/grit size selection
Abrasive blasting equipment
Surface profile
Surface cleanliness after abrasive blasting
Operator qualifications
Safety

Question 17

Abrasive media types include:

Answer 17

Shot & grit (metallic)
Crushed slag
Ceramic grit
Silica sand
Garnet
Agricultural abrasives
Speciality abrasives

Question 18

Abrasive media typically used for recycling include:

Answer 18

Steel shot

Steel grit

Question 19

List the pressure ranges that categorize:

Low Pressure Water Cleaning:

Answer 19

<34 MPa (5,000psi)

Question 20

List the pressure ranges that categorize:

High Pressure Water Cleaning:

Answer 20

34 to 70 MPa (5,000 to 10,000psi)

Question 21

List the pressure ranges that categorize:

High Pressure Waterjetting:

Answer 21

70 to 210 MPa (10,000 to 30,000 psi)

Question 22

List the pressure ranges that categorize:

Ultrahigh-Pressure Waterjetting:

Answer 22

> 210 MPa (30,000psi)

Question 23

Three types of water blasting include:

Answer 23

Grit blasting with a shroud
Sand injected water blast
Slurry blast with grit/water mix

Question 24

The visual guide for use with the NACE-SSPC waterjetting standard is:

Answer 24

SSPC-VIS4 and NACE-VIS 7

Question 25

Three test methods for surface profile include:

Answer 25

Comparator and coupons
Replica tape
Dial gauge depth micrometer (profilometer)