WALTER SCARBOROUGH CSI CCS CCCA SCIP AIA wscarborough@hbig 214.491.7385

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WALTER SCARBOROUGH CSI CCS CCCA SCIP AIA [email protected] 214.491.7385 D+D Specifiers Series Sponsored by Exterior Steel and High- Performance Coatings

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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 Presentation

Transcript of WALTER SCARBOROUGH CSI CCS CCCA SCIP AIA wscarborough@hbig 214.491.7385

Page 1: WALTER   SCARBOROUGH CSI  CCS  CCCA  SCIP  AIA wscarborough@hbig 214.491.7385

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

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D+D Specifiers Series

Sponsored by

Questions

WALTER SCARBOROUGHCSI CCS CCCA SCIP [email protected]