Substrates and PaintsSubstrates and Paints
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)
SubstratesSubstrates
Coated Carbon Steel Hot Dipped Galvanized
G-90 Galvalume
AZ50 Aluminum
Alloy 3003 Temper – H14
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 advantages No applicable corrosion warranty
Galvanic Protection Galvanic Protection
Coating is 100% zinc by volume Hot 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; the other 20% contains zinc and silicon additive
Aluminum/Zinc coated carbon steel sheet meets ASTM A792-96
By volume, consists of a minimum thickness of .50 oz. per sq. ft. of Zn/Al for both sides of the steel sheet
Galvalume Galvalume
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 Galvanized Sheets Corrosion Losses of Galvalume and Galvanized Sheets After 13 Years of ExposureAfter 13 Years of Exposure
0 0.5 1
RURAL
INDUSTRIAL
MARINE - 800 FT
SEVERE MARINE - 80 FT
Corrosion Loss (Mils)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, determined that the corrosion resistance is typically three to four times that of G90 HD Galvanized
Salt Spray Test Concerning the Amount Salt Spray Test Concerning the Amount of Hours to First Significant Rustof Hours to First Significant Rust
0
500
1000
1500
2000
2500
3000
UnprotectedEdges
Protected Edges
Galvalume
H.D. Galvanized
Total # of Hours
Aluminum
Alloy 3003 Temper – H14
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-resitant, organic bonding coating on aluminum, Galvalume, and Galvanized
An approved chromate rinse which is the major agent that allows the primer to bond to the substrate
Approved by Bethlehem Steel for the use on Galvalume
Pre-TreatmentsPre-Treatments
Benefits of pre-treatmentsProvide superior long-term
corrosion protectionEffective on aluminum,
Galvalume and GalvanizedCoating quality is consistently
maintained
PrimerPrimer
The base layer of the paint applied by the coater
Formulated to provide corrosion protection to the base metal and to enhance adhesion between the top coat (paint) and the base metal
Major Components That Make Up a Major Components That Make Up a Paint SystemPaint System
PigmentsPigments ResinResin SolventsSolvents AdditivesAdditives
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 Earth tones Organic
Two classes of pigments: Appearance Functional
PigmentsPigments
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)
SolventsSolvents
The vehicle by which the pigment is “transported” to the metal surface
Solvents evaporate during the curing process to permit 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
Component FunctionsComponent Functions
Pigment 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 SystemsTypes of Paint Systems
Polyester Siliconized Polyester Polyvinylidene Fluoride (PVDF)
Polyester Paint SystemsPolyester Paint Systems
A generic polymer coating with limited weathering performance End uses: interior applications
Home appliances Lighting fixtures Wall panels
Siliconized Polyester Paint Siliconized Polyester Paint SystemsSystems
A generic coating type that represents a wide range of topcoats used on pre-painted metal in construction
The silicon extends the service life of the base polymer and improves weathering
End uses: Metal building components Agricultural and corrugated panels
Polyvinylidene Fluoride (PVDF)Polyvinylidene Fluoride (PVDF)
A fluoropolymer resin used as the major vehicle (base resin) in the paint system
Paint chemistry is 70% by weight PVDF resin
Exhibits superior: Color retention Chalk resistance Corrosion resistance Flexibility Stain resistance Overall exterior durability
PVDF CoatingsPVDF Coatings
Architectural coatings that Architectural coatings that extend building life and keep it extend building life and keep it
looking the way it was designed!looking the way it was designed!
How it worksHow it works
Advance molecular structural of PVDF utilizes 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
is the measured effect of sunlight, UV radiation, heat, and moisture on
pre-painted steel
is the measured effect of sunlight, UV radiation, heat, and moisture on
pre-painted steel
Paint weathering is measured Paint weathering is measured in resistance to:in resistance to:
DefinitionsDefinitions
Chalk: Residue resulting from weathering
decomposition of paint films Visual ratings are assigned according
to ASTM D659; ratings range from 10-0 (10 is best)
Fade: change in a paint film color and appearance due to degradation from weathering and UV radiation in sunlight
Chalk: Residue resulting from weathering
decomposition of paint films Visual ratings are assigned according
to ASTM D659; ratings range from 10-0 (10 is best)
Fade: change in a paint film color and appearance due to degradation from weathering and UV radiation in sunlight
DefinitionsDefinitions
Color fade: Expressed in calculated “delta E”
values or NBS units which are measured and calculated according to ASTM D2244
Values range from 0 to infinity, where0 is best; i.e., no color change
Color fade: Expressed in calculated “delta E”
values or NBS units which are measured and calculated according to ASTM D2244
Values range from 0 to infinity, where0 is best; i.e., no color change
PVDF CoatingsPVDF Coatings
Made with 70% PVDF resin – KYNAR® 500 or HYLAR® 5000
Exhibit excellent fabrication flexibility and weatherability
Use ceramic-inorganic pigments, which provide excellent resistance to color chalking and fading
Made with 70% PVDF resin – KYNAR® 500 or HYLAR® 5000
Exhibit excellent fabrication flexibility and weatherability
Use ceramic-inorganic pigments, which provide excellent resistance to color chalking and fading
Cold Rolled Steel
Zinc or Zinc-Aluminum Layer
Ceramic/Inorganic Topcoat Pigment
PVDF Resins Surrounding Topcoat Pigment
Metal Treatment
Metal Treatment
0.2-milPrimer0.2-milPrimer
0.8-milTopcoat0.8-mil
Topcoat
Topcoat Layer: Protects Against Topcoat Layer: Protects Against UV Radiation, Heat and MoistureUV Radiation, Heat and Moisture
South Florida Exposure Testing EMMAQUA Exposure Testing
Test Panels
Mirrors
Why PVDF is # 1Why PVDF is # 1
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
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
Superior Chalking and Superior Chalking and Weathering ResistanceWeathering Resistance
These panels exposed at an independent test facility in Southern Florida clearly demonstrate the superior weather-ability of PVDF (left sample)
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: Corrosion /
degradation of the substrate
EXCEPTIONAL MetalsEXCEPTIONAL Metals
Offers Akzo Nobel Trinar coated products.Offers Akzo Nobel Trinar coated products.