walter scarborough csi ccs ccca scip aia wscarborough@hbig 214.491.7385
DESCRIPTION
D+D Specifiers Series. Exterior Steel and High-Performance Coatings. WALTER SCARBOROUGH CSI CCS CCCA SCIP AIA [email protected] 214.491.7385. Sponsored by. Webinar Intentions. - PowerPoint PPT PresentationTRANSCRIPT
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WALTER SCARBOROUGHCSI CCS CCCA SCIP [email protected]
D+D Specifiers Series
Sponsored by
Exterior Steel and High-PerformanceCoatings
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To identify the properties of a coating and to discuss the most common coating system typically used for ferrous metals at the exterior of buildings
Webinar Intentions
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Basics
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Why Coat Steel?
Protection
Aesthetics
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Basics of Rust
Steel + Oxygen + Moisture
RUST
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Mechanism of Protection
• Barrier to protect steel from
effects of its environment
• Inhibitive by controlling the rate of
corrosion
• Sacrificial by deteriorating before
the steel
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Properties of a Coating
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Properties of a Coating
• Chemical resistance
• Low moisture permeability
• Ease of application
• Adhesion
• Cohesive strength
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Properties of a Coating
• Tensile strength
• Flexibility
• Impact resistance
• Abrasion resistance
• Temperature resistance
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Properties of a Coating
• Cold flow resistance
• Dielectric strength
• Surface tolerant
• VOC compliant
• Low odor
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Selection of a Coating
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Selection of a Coating
• Type of exposure
• Operating conditions
• Substrate
• Application ambient conditions
• Environmental regulations
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Selection of a Coating
• Budget
• During operation or shutdown
• Time constraints
• New construction or maintenance
• Shop or field application
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Selection of a Coating
• Design or fabrication considerations
- Inaccessible areas
- Bolted connections
- Dissimilar materials
- Imperfections (welds, laminations, and
gouges)
- Sharp corners
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Typical Exterior System
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Typical Exterior System
One of the longest lasting systems includes following:
Primer: Zinc-Rich
Intermediate Coat: Epoxy
Top Coat: Polyurethane
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•Binder, or resin, that is highly loaded with a metallic zinc-dust pigment•Binder holds zinc particles in contact with steel substrate to create a galvanic cell (zinc will deteriorate before steel)•Provides anticorrosion (galvanic) protection for as long as 20 years or longer
Zinc-Rich Coatings
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•Requires clean steel substrates•Best method of application is in the fabrication shop
Zinc-Rich Coatings
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•Exceptional adhesion strength•Resistant to solvents and chemicals•Water-borne and high-solids are dominant technologies in use
Epoxy Coatings
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•Have a fatal flaw - not UV light stable and thus requires a top coat
Epoxy Coatings
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•One of most versatile coatings available•Chemical and solvent resistant•Best color and gloss retention Light stable•Abrasion resistant•Long lasting
Polyurethane Coatings
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•Acrylic polyurethanes are good for aesthetics•Polyester polyurethanes are good for chemical resistance, but weather resistance not as good
Polyurethane Coatings
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•Zinc-rich protects the steel by
becoming sacrificial coating
•Epoxy protects the zinc-rich
•Polyurethane protects
the epoxy and provides
color
Purpose of Coatings
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Shop or Field Applied
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Shop coating steel is always far better than field applying a coating
Shop or Field Applied
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Cost is lower than field coating
Shop or Field Applied
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Safer for workers because there is not a large force of painters up in the air
Shop or Field Applied
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Short pot life of multi-component coatings is a logistical challenge when field coating
Shop or Field Applied
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Reduced construction time
Shop or Field Applied
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More efficient use of resources•Less labor•Blasting media is recycled
Shop or Field Applied
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Controlled application conditions
Shop or Field Applied
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Field Considerations
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Bolted connections require special attention
Field Considerations
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Bolted connections in the lay-up-yard
Field Considerations
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Bolted connections up in the air
Field Considerations
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For quality control purposes, good if manufacturer can conduct field training
classes for touch-up work
Field Considerations
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Imperfection and damage touch-up
Field Considerations
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Peeling paint due to overlap of primer at interior corners of H-sections
Field Considerations
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Coating does not cover weld splatter
Field Considerations
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Spot rusting due to proximity of paint booth and blasting area
Field Considerations
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•Coating selection should be based factors that are important to the application•Zinc-rich, epoxy, and polyurethane is high quality coating system that is useful for architectural applications•Shop coating will always be better than field coating
Conclusions