vanadate conversion coatings paint expo
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Vanadate Conversion Coatings
Don LaFlamme Coral Chemical Company
Vanadium
• Vanadium has high resistance to corrosion
– Commonly used to form steel alloys or ferrovanadium
– 80% of Vanadium is used as steel additive (prevent rust / strengthen the steel)
– Vanadium is added to high speed tools and cutting objects.
– Added to engine parts such as the axles, crankshafts and gears in cars
Vanadate Treatments
• Vanadate Treatments – Anodized Coatings
– enhance the corrosion protection by acting as corrosion inhibitors
for Al alloys
• Vanadate Treatments - Magnesium Alloy Substrates
– Various patented formulas / Pre-Paint Applications
• Vanadate Treatments - Ferrous Substrates
– In 1999, Coral Chemical patented a vanadate final seal rinse
– 2005, Coral Chemical commercialized a vanadate product
treatment for steel / galvanized substrates “patent pending”
• Vanadium Reacts With Oxygen To Form A Vanadium (V) Oxide Conversion Coating, V2O5
• 4V(2)+5O2(G)2V2O5(S)[yellow-orange]
• Transitional Metal Oxide Coating
Vanadate Conversion Coatings
Bare Cold Rolled Steel
Treated Cold Rolled Steel
Scanning Electron Microscope
30 – 40 nm
System Design
System Design
Cold Rolled Steel
Cold Rolled Steel Galvanized
Applied Chemical Costs
$7.50/1000 sq. ft.
$3.65/1000 sq. ft.
$3.25/1000 sq. ft.
$3.45/1000 sq. ft.
$3.25/1000 sq. ft.
$3.25/1000 sq. ft.
Based on actual line data
Performance
500 / 750 Hour Salt Spray - Cathodic Epoxy E-Coat
0
0.5
1
1.5
2
2.5
3
3.5
4
VCC low pH VCC hi pH Iron Phosphate
Mil
lim
ete
rs o
f C
ree
p f
rom
th
e S
cri
be
2.0 – 3.0 pH 3.0 – 4.0 pH 4.5 – 5.5 pH
500
500
500
750
750
750
Fontana Corrosion Center
300 – 400 nm
END OF PRESENTATIONANY QUESTIONS?
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