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Substrates and PaintsSubstrates and PaintsDrexel Metals Corporation
204 Railroad Drive
Ivyland, PA 18974
Brian Partyka
www.drexmet.com
Substrates and PaintsSubstrates and Paints Substrates
– Hot Dipped Galvanized – Galvalume – Aluminum
Paint– The importance of Pre-Treatments– The importance of Primers– Paint Systems used in our industry.
Polyesters Siliconized Polyester Polyvinylidene Fluoride (PVDF) Plastisols
SubstratesSubstrates
Coated Carbon Steel – Hot Dipped Galvanized
G-90– Galvalume
AZ50Aluminum
– Alloy 3003 – 3004 - 3105– Temper – H14 – H24 – H34
Hot Dipped Galvanized Hot Dipped Galvanized
Zinc Coated Carbon Steel sheet that meets ASTM A653-96.
Coating Weight of G-90– By volume consists of a minimum thickness
of .80 oz of zinc per Sq Ft for both sides of the steel sheet.
Great Sacrificial AdvantagesNo applicable corrosion warranty
Galvanic ProtectionGalvanic Protection
Coating is 100% zinc by volumeHot Dipped Galvanized offers a desirable
characteristic with respect to corrosion by sacrificing itself to protect slit edges and scratches.
Generally has a smoother surface for paint application purposes.
Superior Formability.
Galvalume Galvalume By volume, Galvalume contains 80% aluminum in
the coating with the other 20% containing zinc and silicon additive.
Aluminum/Zinc Coated Carbon steel sheet that meets ASTM A792-96.
By volume consists of a minimum thickness of .50 oz per Sq Ft of AL/Zn for both sides of the steel sheet.
Coating Weight – AZ50 or AZ55 Great Corrosion Properties Good Sacrificial Advantages 20 year 6 month warranty against corrosion
Galvalume vs. HD GalvanizedGalvalume vs. HD Galvanized
Hot Dipped Galvanized – After 18 years, G-90
Galvanized exhibits red rust
Galvalume– Galvalume after 23 years –
No major sign of red rust.
Moderate Marine / Rural
Corrosion Losses of Galvalume and Corrosion Losses of Galvalume and Galvanized Sheets after 13 years exposureGalvanized Sheets after 13 years exposure
0 0.2 0.4 0.6 0.8 1
GALVALUME
H.D.GALVANIZED
RURAL
INDUSTRIAL
MARINE - 800 FT
SEVERE MARINE - 80 FT
Corrosion Loss (Mils)
Salt Spray Corrosion ResistanceSalt Spray Corrosion Resistance
With cut edges protected, the coating on Galvalume AZ50 lasts 5 to 10 times longer than the coating on G90 HD Galvanized.
Salt spray tests conducted with bare cut edges exposed, the corrosion resistance is typically three to four times that of G90 HD Galvanized.
Salt Spray test concerning the amount of Salt Spray test concerning the amount of hours to first significant rusthours to first significant rust
0
500
1000
1500
2000
2500
3000
Unprotected edges Protected Edges
Galvalume
H.D. Galvanized
Total # of Hours
Aluminum Aluminum Conforms to ASTM B209-96.Either:
– Direct cast from ingot.– Continuous cast from recycled scrap.
Advantages: – Light in weight.– Highly resistant to corrosion.– Excellent reflector of light and heat.– Highly workable and easy to form.
Aluminum Alloys and TempersAluminum Alloys and Tempers
Standard alloys for roofing and cladding; – 3003– 3004– 3105– 5052
Commonly used tempers; – H 14– H 24– H 34
Painted ProductsPainted Products
What a painted product consists of:What a painted product consists of:
Cold Rolled Steel
Zinc (HDG) orZinc-Aluminum
(Galvalume®)
Substrate
Pre-Treatment
Layer
Substrate
Pre-Treatment
Layer
Primer(0.20 - 0.25
mils)
TRINAR ®Topcoat
(0.70 - 0.90 mils)
Primer(0.20 - 0.25
mils)
Polyester Backer(0.30 - 0.50 mils)
Prepaint Cross-Section
Pre-TreatmentsPre-Treatments A liquid used to produce a corrosion-resistant,
organically bonded coating on Aluminum, Galvalume and Galvanized.
Incorporating a chromate rinse which is the major agent that allows the primer to bond to the substrate and helps prevent corrosion.
Benefits of Pretreatments:– Provides superior long term corrosion.– Effective on Aluminum, Galvalume and
Galvanized.– Coating quality is consistently maintained.
PrimerPrimerThe base layer of the paint applied by the
coater to the pretreated substrate. It is formulated to provide corrosion
protection to the base metal and to enhance adhesion between the top coat (paint) and the base metal.
Standard Primers: – Water Based– Urethane Based
What are the 4 major components What are the 4 major components that make up a paint systemsthat make up a paint systems
Resin Resin PigmentsPigmentsSolventsSolventsAdditivesAdditives
Resin Systems Resin Systems
The most important part of any paint system. The liquid glue of the paint system that surrounds
the pigment particles, protecting them from environmental pollutants such as airborne chemicals and salt.
Types of resin systems: – Polyester– Siliconized Polyester– Polyvinylidene Fluoride (PVDF)
PigmentsPigments Small solid particles added to a paint to enhance
appearance by providing color and /or improve physical (functional) properties of a paint.
Pigments are protected by the resin system. Types of Pigments:
– Ceramic Pigments– Earth Tones Pigments– Organic Pigments
UV Reflective Pigments
SolventsSolvents
This is the vehicle by which the pigment is transported to the metal surface
Actually evaporate during the curing process to permit the the formation of a paint film.
AdditivesAdditives
Any number of chemicals added to the paint, usually in small amounts to bring special effects to the paint.
Functions of the ComponentsFunctions of the ComponentsPigment Resin Solvent Additive
Aesthetics Properties Application Enhancement
Color Durability Stability Mar Resistance
Gloss Adhesion Viscosity Curing Agent
Adhesion Flexibility Compatibility Settling
Film Strength Color Retention Film Control Dispersion
Water Resistance Abrasion Adhesion Anti-Freeze
Corrosion Resistance Impact Resistance Leveling De-Foaming
Types of Paint Systems used in the field.Types of Paint Systems used in the field.
Polyester Siliconized PolyesterPolyvinylidene Fluoride (PVDF)Plastisols
Polyester Paint SystemsPolyester Paint Systems
A generic polymer coating with limited weathering performance.
Generally Using Organic Pigments.– End Uses:
Interior Applications– Home Appliances
– Lighting Fixtures
– Wall Panels
Siliconized Polyester Paint SystemsSiliconized Polyester Paint Systems
A generic coating type that represents a wide range of topcoats used on prepainted metal in construction.
The silicon extends the service life of the base polymer and improves weathering.
Generally Using Organic and Ceramic Pigments.– End Uses:
Metal Building Components. Agricultural and Corrugated panels.
Polyvinylidene Fluoride (PVDF)Polyvinylidene Fluoride (PVDF) The resin, which is a fluoropolymer, that is used as the
major vehicle (base resin) in the paint system. Paint chemistry of 70% by weight of PVDF resin. Exhibits superior
– Color retention– Chalk resistance– Corrosion Resistance – Flexibility – Stain Resistance – Overall exterior durability
Why PVDF is # 1Why PVDF is # 1
How it works!How it works!
Advance molecular structural of PVDF utilizes the following:– carbon-fluorine bond, the strongest bond
known in the chemical world combined with a carbon-hydrogen bond, which creates a structure that is extremely durable.
PVDF CoatingsPVDF Coatings
Architectural Coating that extends Architectural Coating that extends your buildings life, and keeps it your buildings life, and keeps it looking the way you designed it!looking the way you designed it!
PVDF vs. Other CoatingsPVDF vs. Other Coatings
Color Change
0
5
10
15
20
25
30
0 1 2 3 4 5 6 7 8 9 10 11
Florida Exposure Time (Years)
Co
lor
Ch
an
ge
(de
lta
E)
SMP
Polyester
PVDF
PVDF vs. Other CoatingsPVDF vs. Other Coatings
Gloss Retention
0
20
40
60
80
100
1 2 3 4 5 6 7 8 9 10 11
Florida Exposure Time (Years)
Glo
ss R
eten
tio
n (
%)
Polyester
SMP
PVDF
Weathering PropertiesWeathering Properties
0
1
2
3
4
5
ColorRetention
GlossRetention
ChalkResistance
HumidyResistance
Legend: 5 = Highest Performnce 1 = Lowest Performance
Polyester
SMP
PVDF
Prepainted Steel
Specifically,
Is the measured
affect of..
Sunlight, Ultra-Violet (U V) Radiation, Heat and
Moisture on
Physical PropertiesPhysical Properties
0
1
2
3
4
5
AbrasionResistance
ImpactResistance
FilmFlexibility
Hardness Mar
Legend: 5 = Highest Performnce 1 = Lowest Performance
Polyester
SMP
PVDF
Chemical PropertiesChemical Properties
0
1
2
3
4
5
Aids& Alkalies Oil Stain Water Immersion
Legend: 5 = Highest Performnce 1 = Lowest Performance
Polyester
SMP
PVDF
is measured in is measured in resistance to...resistance to...
PaintPaint
Visual Ratings are assignedaccording to ASTM D659. Ratings range from 10 - 0; where 10 is best.
is the residueresulting from Weathering Decomposition of paint films.
Definitions:Definitions:
is the change in a paintfilm color and appearance due to degradation from Ultraviolet Radiation in Sunlight.
is paint film appearance change due to Color Weathering.
Definitions:Definitions:
is expressed in calculated “delta E “ values or NBS Units which are measured and calculated according to ASTM D2244.
Values range from 0 to infinity, where 0 is best; i.e. no color change.
Definitions:Definitions:
Superior Chalking and Weathering ResistanceSuperior Chalking and Weathering Resistance
These panels exposed at an independent test fence facility in Southern Florida clearly demonstrate the superior weatherability of PVDF.
Elements of a PVDF WarrantyElements of a PVDF Warranty
PVDF Paint Warranties cover the following for 20 years:– Film Integrity– Color Fade– Chalk Resistance– Delamination
PVDF Paint Warranties do not cover the following: – Corrosion/degradation of
the substrate
Tobago HiltonTobago Hilton
Manufacture and Contractor:
Weathershield Caribbean Ltd.
Trinidad and Tobago
DREXEL METALS DREXEL METALS CORPORATIONCORPORATION
offers Akzo Nobel Trinar offers Akzo Nobel Trinar coated products! coated products!