Week 2 Quiz Flashcards by Maranda Moore

The two broad classification for curing mechanisms are

convertible and non-convertible

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the two non-convertible coating types are

chlorinated rubber and vinyl

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the primary convertible coating curing mechanisms are

Oxidation, Co-reaction (polymerization), Hydration, and Fusion

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The characteristics of oxidation cure coatings are

Not suitable for immersion service.
Not suitable for use over alkaline substrates.
Limited dry film thickness per coat.

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List the coating types that cure by polymerization

Epoxies
Polyurethanes
Polyureas
Polyaspartics
Polysiloxanies

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Induction time is

The time required by the product data sheet (coatings manufacturer) between mixing the coating and the start of application.

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

Moisture

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Industrial and marine coatings are commonly referred to by

Generic resin type

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Oil based coatings applied over alkaline surfaces may result in

Saponification

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List the formal sections usually contained in a good specification

Scope of work
Terms and Conditions
Reference standards and codes
Safety
Pre-job conference
Surface preparation
Coating Materials (includes the coating schedule)
Sampling Coatings
Workmanship
Application
Work Schedule (sequence of work to be done)
Repairs and remedial coating work
Inspection
Documentation

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What are two of the inspector’s responsibilities as it relates to the specification?

Verify the specification and not to make changes to the specification.

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During the surface preparation, surface cleanliness should be inspected (as minimum) the following three times:

Before any surface preparation activities.
After surface preparation, before coating begins.
Between each application of coating in a multi-coat system.

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Factors during surface preparation that may effect service life include:

Residues of oil, grease, and soil
Residues of (non-visible) chemical salts
Rust on the surface
Loose or broken mill scale
Rust scale
Anchor pattern
Defects mechanical cleaning equipment
Surface condensation
Old coatings that may have poor adhesion or may be too deteriorated for recoating
Existing coatings that may be incompatible

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Common design defects include

Hard-to-reach or inaccessible areas
Rivets, bolts, or other connectors
Welds
Gaps (particularly skip welds or surfaces close together)
Overlapping surfaces (e.g., roof plates in water tanks)
Angle iron badly oriented or in complex arrangements
Threaded areas
Dissimilar metals
Sharp edges, particularly on corners or rough cut plate
Construction aids

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Common fabrication defects include

Weld Spatter
Skip Welds
Rough Welds
Sharp Corners & Edges

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SSPC SP1 pre-cleaning methods include:

Solvent wipe with cloth or rag
Immersion or the substrate in solvent
Solvent spray
Vapor degreasing
Steam cleaning
Emulsion cleaning
Chemical Paint Stripping
Use of alkaline cleaners

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The standards for Power Tool Cleaning

SSPC-SP3
SSPC-SP 15
SSPC-SP11
ISO 8501-1, St2 or St3

Tools used for Power Tool Cleaning are

Rotary Wire Brushes
Impact tools
Needle Scaler
Rotary Scalers
Piston Scalers
Grinders and sanders
Disc Sanders

Abrasive Blasting methods include

Centrifugal blasting
Sand-injected water blast
Slurry blast
Wet abrasive blast
Dry grit Blast Cleaning (Air Blasting)

Visual Standards for abrasive blasting include

SSPC-Vis 1

ISO 8501-1

SSPC SP 10/NACE 2 limits staining to

5% per each unit area

SSPC SP 5/NACE 1 limits staining to

0% per each unit area

SSPC SP 6/NACE 3 limits staying to

33% per each unit area

The two types of abrasive blasting nozzles include:

Straight

Venturi

The specified level of surface cleanliness must be achieved and maintained

immediately prior to coatings application

Advantages of centrifugal blast equipment include:

Dust and Fines are contained Abrasives are easily recycled Blasting and priming can be an inline operation General overall economy compared to air blasting No compressors, piping, or air handling equipment needed for wheel blasting

The Inspectors checklist for surface preparation should include:

``` Ambient conditions Conditions of substrate Pre-Blast surface cleanliness Shot/Grit size selection Shot/Grit Cleanliness Abrasive Blasting Equipment Surface Profile Surface Cleanliness after abrasive blasting Operator qualifications Safety ```

Abrasive media types include:

``` Shot & Grit (metallic) Crushed Slag Ceramic Grit Silica Sand Garnet Agricultural Abrasives Specialty Abrasives ```

Abrasive media typically used for recycling include:

Steel Shot | Steel Grit

List the pressure ranges that categorize:

Low Pressure Water Cleaning: <34 MPa (5,000 psi) High-Pressure Water Cleaning: 34 to 70 MPa (5,000 to 10,000 psi) High-Pressure Water Jetting: 70 to 210 MPa (10,000 to 30,000 psi) Ultrahigh=Pressure Water Jetting: >210 MPa (30,000 psi)

Three types of Water-Blasting include:

Grit blasting with a shroud Sand injected Water Blast Slurry Blast with Grit/Water Mix

The NACE/SSPC Waterjetting Standard is

SSPC/VIS 4 and VIS 7 are visual comparators to be used with the standard

Three Test Methods for surface profile include:

Comparator and coupons Replica tape Digital Surface Profile Gauge

Types of Soluble Salt Contamination include:

Chlorides Sulfates Nitrates

If inspection is to be effective with regards to soluble salts, the specification should very clearly state:

``` Limits to be accepted Specific salts to be limited Test method to be used Frequency of testing Locations in which tests should be administered ```

Test for soluble salts include

Bresle Patch Sleeve Test Soluble Salt Meters Conductivity Meters

Depth of surface profile can be evaluated by several methods

ISO comparator Replica Tape Digital Profile Gauge

The ISO Comparator grades may be recorded

``` Finer-than-Fine Grade Fine Grade Medium Grade Coarse Grade Coarser-than-Coarse Grade ```

The two types of replica tape are commonly used:

Coarse - for 20 to 64 um (0.8 to 2.5 mils) | X-Coarse - for 38 to 115 um (1.5 to 4.5 mils)

List the standards for using the Replica tape

ASTM D 4417 Method C | NACE SP 0287-2002

When using Replica tape common errors include:

Variation in the point-to-point over the surface being tested The presence of particles of dirt on either the replica tape or gauge Gauge Accuracy The rubbing or burnishing technique