Nanocomposite Zinc Coating
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Transcript of Nanocomposite Zinc Coating
TEC STAR S.r.l.Viale Europa, 40 – 41011 Campogalliano (Italy)Tel. (+39)059 527775 – Fax (+39)059 527773
C.F./P. IVA 03209920366
Nanoparticles in galvanic Zinc coating: Mechanical properties improvement
Dr. Alberto Borghi
Tec Star Srl - President | CEO
TEC STAR S.r.l.Viale Europa, 40 – 41011 Campogalliano (Italy)Tel. (+39)059 527775 – Fax (+39)059 527773
C.F./P. IVA 03209920366
[Xia et al., 2009, Journal of Materials Processing Technology, 209: 2632–2640]
Introduction
Nanoparticles of Yttrium Stabilized Zirconia (YSZ) are good additive for galvanic Zinccoating. They increase corrosion resistance and hardness of galvanic coating.
TEC STAR S.r.l.Viale Europa, 40 – 41011 Campogalliano (Italy)Tel. (+39)059 527775 – Fax (+39)059 527773
C.F./P. IVA 03209920366
[Fustes et al., 2009, Journal of Solid State Electrochemistry, 12:1435–1443]
Introduction
TiO2 nanoparticles, as additive for galvanic Zinc coatings, may decrease grain sizeimproving the hardness of the coating.
Other studies related to different galvaniccoatings, i.e. Nickel, give improvement ofchemical and mechanical properties usingdifferents nanoparticles additive. Forexample: SiO2, TiO2, Al2O3, ZrO2, SiC, Cr2O3.
TEC STAR S.r.l.Viale Europa, 40 – 41011 Campogalliano (Italy)Tel. (+39)059 527775 – Fax (+39)059 527773
C.F./P. IVA 03209920366
YSZ Cr2O3
TiO2SiC
Experimentation parameters andtypology of nanoparticles (NP) usedas additive for galvanic Zinc coating.
Tec Star experimentation
Parameters Values
Type of Nanoparticle Cr2O3 YSZ SiC TiO2
Current Density Low Medium High
Concentration Low High
TEC STAR S.r.l.Viale Europa, 40 – 41011 Campogalliano (Italy)Tel. (+39)059 527775 – Fax (+39)059 527773
C.F./P. IVA 03209920366
Nanoparticles Stabilizer Dimension [nm] Zeta Potential [mV]
Cr2O3
- 838 +1.9
A 925 -6.2
B 857 +5.4
YSZ
- 728 -2.1
A 849 -3.7
B 879 +4.7
SiC
- 2292 +10.5
A 2371 -5.17
B 1474 +16.7
TiO2
- 1474 -0.8
A 1527 +6.0
B 1320 +4.2
Nanoparticles stabilizer: we measure the Zeta potential of NP in water dispersion.The best solution for galvanic Zinc bath is with high positive Zeta potential.
Tec Star experimentation
TEC STAR S.r.l.Viale Europa, 40 – 41011 Campogalliano (Italy)Tel. (+39)059 527775 – Fax (+39)059 527773
C.F./P. IVA 03209920366
Tec Star experimentation
Current Density: Low Medium High
Current Density: Low Medium High
TEC STAR S.r.l.Viale Europa, 40 – 41011 Campogalliano (Italy)Tel. (+39)059 527775 – Fax (+39)059 527773
C.F./P. IVA 03209920366
Nanoparticles additives: Cr2O3 and TiO2, mechanical and morphological properties
TiO2 nanoparticles increase mechanical properties using low current density duringdeposition process. At the same time give bad resutls in surface finishing of Zinccoating.
Morphology and mechanical properties
TEC STAR S.r.l.Viale Europa, 40 – 41011 Campogalliano (Italy)Tel. (+39)059 527775 – Fax (+39)059 527773
C.F./P. IVA 03209920366
Nanoparticles additive: YSZ and SiC, mechanical and morphological properties
YSZ nanoparticles show, at high and medium current density deposition, the bestmechanical and morhological properties.
Morphology and mechanical properties
TEC STAR S.r.l.Viale Europa, 40 – 41011 Campogalliano (Italy)Tel. (+39)059 527775 – Fax (+39)059 527773
C.F./P. IVA 03209920366
Standard TiO2 low concentration
Neutral Salt Fog test results
72 hours
Corrosion resistance test
TEC STAR S.r.l.Viale Europa, 40 – 41011 Campogalliano (Italy)Tel. (+39)059 527775 – Fax (+39)059 527773
C.F./P. IVA 03209920366
Nanoparticles do not avoid white Zinc oxidation butincrease protection to red corrosion from the ironsubstrate.
Best nanoparticles for corrosion resistance are TiO2 eYSZ.
Corrosion resistance test
TEC STAR S.r.l.Viale Europa, 40 – 41011 Campogalliano (Italy)Tel. (+39)059 527775 – Fax (+39)059 527773
C.F./P. IVA 03209920366
TiO2 high concentration
144 hours
Experimentation on real samples using nanoparticle additives: TiO2 and YSZ.Pictures show samples before and after Neutral Salt Fog test.
YSZ high concentration
Real Samples
After deposition
TEC STAR S.r.l.Viale Europa, 40 – 41011 Campogalliano (Italy)Tel. (+39)059 527775 – Fax (+39)059 527773
C.F./P. IVA 03209920366
Contacts
Dr. Alberto [email protected]
TEC STAR SrlViale Europa, 40
41011 Campogalliano (MO) - ItalyTel (+39)059.526845 Fax (+39)059.527000