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8/10/2019 (Evonik) Novel Water-Borne Sol-Gel Systems for Metal Treatment
1/15
Novel Water-BorneSol-Gel Systemsfor Metal Treatment
Ramon Sanchez-Morillo, PhD, MS
Piscataway Technology Center, NJ, USA
1-732-981-5329
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Adhesion Promotion with Silanes
O
Si O
Y = Organofunctional groupOR = Silicon-functional group
Y
Adhesion promotion effect
ORHO
Page 2Seite | 2
Ramon Sanchez Morillo, PhD 1-732-981-5329 [email protected] April 2010, AC Show
OOSiY
Polymer + Silane + Surface
SiY OR
OR
+HO
+
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Why Use Silanes forMetal Treatment?
Adhesion promoter for a
subsequent coating
R
OO
R SiSi
Si
O
SiO
R
OHO
O Si
Si
R
O
OOO
O
O
OO
O
O
O
O
R
Si
OO Si
Si Si
Si SiSi
Si
O
Si
Si
OO
R O ORO
OR
O
O
O
Si SiSi
Page 3Seite | 3
Ramon Sanchez Morillo, PhD 1-732-981-5329 [email protected] April 2010, AC Show
Passivation of metal surface due to reaction with substrate
Hydrophobic inner layer
Barrier layer for chlorideand waterMetal substrate
O
SiHO O
O
Si
R
O
O
O
OO
OSiSi
OO O
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New Silane Developments:Ever More Sophisticated
nn
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Ramon Sanchez Morillo, PhD 1-732-981-5329 [email protected] April 2010, AC Show
Sophistica
ti
Time
Sophistica
ti
Time
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Dynasylan SIVO 110Inorganic Resin with Inorganic Particles
Features:
High flashpoint(>95 C)
Compatible with water
Page 5Seite | 5
Ramon Sanchez Morillo, PhD 1-732-981-5329 [email protected] April 2010, AC Show
an po ar so ven s
Compatible withpolymer dispersions,e.g. acrylics
VOC content < 3wt.-%
Shelf life > 12 months
OH OH
OH
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Comparison
Steel,
spray galvanized
All panels have a 60-80 polyester powder coating on the surface
Sand blasted
steel, no primer
Sand blasted steel
with SIVOSOLTechnology
Page 6Seite | 6
Ramon Sanchez Morillo, PhD 1-732-981-5329 [email protected] April 2010, AC Show
500 hours saltspray test White rust
The SIVOSOL Technology can be used as an alternative to multilayerpowder coatings (~150-200) or zinc treatment.
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Typical Applications for theSIVOSOL Technology
Structural parts that are made of steel and are powder coated.
Examples:
City furniture:
Page 7Seite | 7
Ramon Sanchez Morillo, PhD 1-732-981-5329 [email protected] April 2010, AC Show
Park benches
Street lighting
Building faades
Decorative partsPicasso Center in Basel,
Switzerland
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SIVOSOL Technology:
Resin for the formulationof corrosion protectionsystem
Development of New Low-Temperature Curing Technology
DynasylanSIVO 160:
Resin for the formulationof corrosion protectionsystem
Page 8Seite | 8
Ramon Sanchez Morillo, PhD 1-732-981-5329 [email protected] April 2010, AC Show
Cured at hightemperature: 200 C for 10minutes
Excellent for theformulation of primers
below powder coatings
Cured at lowtemperature: 60 to 80 Cfor 10 minutes
Excellent for theformulation of primers
and blank corrosionprotection systems
New Silane Technology
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Water-borne
Nearly VOC free
Shelf life: 1 year
Key properties
DynasylanSIVO 160 A New Water-BorneLow Temperature Curing Sol-Gel System
Page 9Seite | 9
Ramon Sanchez Morillo, PhD 1-732-981-5329 [email protected] April 2010, AC Show
pH ~ 4,0 4,6
Solid content ~ 9 %
Colorless to yellow
liquid
Viscosity: 9 mPa s (20C)
Particle distribution of Dynasylan
SIVO 160Volumetric median particle size: 5,4
nm
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DynasylanSIVO 160 on Aluminium
Substrate
10 % aqueous solution of DynasylanSIVO 160 coates aluminiumsubstrate without defects.
aluminium substrate
SIVO 1601.Di in
Coated aluminium substrate
Layer thickness ~ 150 nm
Page 10Seite | 10
Ramon Sanchez Morillo, PhD 1-732-981-5329 [email protected] April 2010, AC Show
2.Curing 80 C
Investigation of the surface via XPS
Si* 0,89 19,6Al* 33,2 0,0
* [atom %]
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Corrosion Protection on Aluminum withEpoxy Powder Coating
500 h CASS
Blank Chromated SIVO 160
Substrate Aluminum (5005)
Degreasing / Cleaning Alkaline degreasing Alkaline etching (0,5 g/m2) Acid pickling
Page 11Seite | 11
Ramon Sanchez Morillo, PhD 1-732-981-5329 [email protected] April 2010, AC Show
Pre-treatment DynasylanSIVO 160 Pre-dried at 60 C, 10 minTopcoat
Epoxy powder coating, 60 Cured at 180 C, 20 min
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Corrosion Protection on Aluminum withAcrylic PU Coating
3000 h NSS
No Silane SIVO 160
Substrate Aluminum (2024T3Clad)
Degreasing / Cleaning Alkaline degreasing
Pre-treatment
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Ramon Sanchez Morillo, PhD 1-732-981-5329 [email protected] April 2010, AC Show
DynasylanSIVO 160
Pre-dried at 60 C, 10 min
Topcoat 2 parts PU paint, 60 Cured at RT for 2 weeks
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Corrosion Protection on Magnesium withPolyester Powder Coating
1000 h CASS
Blank Chromated SIVO 160
Substrate Magnesium (AZ31B)
Degreasing / Cleaning Alkaline degreasing
Pre-treatment
Page 13Seite | 13
Ramon Sanchez Morillo, PhD 1-732-981-5329 [email protected] April 2010, AC Show
Pre-dried at 60 C, 10 min
Topcoat Polyester powder coating,60
Cured at 180 C, 20 min
Dynasylan SIVO 160 works
best after alkaline degreasing
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Corrosion Protection on Passivated Hot-Dip Galvanized Steel
250 h salt spraySubstrate Hot dip galvanized steel withchemical passivation
Degreasing / Cleaning Ethyl acetate
HDG passivated SIVO 160
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Ramon Sanchez Morillo, PhD 1-732-981-5329 [email protected] April 2010, AC Show
Treatment Dipping in DynasylanSIVO 160formulation Cured at room temperature Layer thickness: ~ 1.0 m
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Ramon Sanchez Morillo, PhD 1-732-981-5329 [email protected] April 2010, AC Show