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Nanocomposite Zinc Coating

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Alberto Borghi

The document discusses using nanoparticles as additives in galvanic zinc coatings to improve mechanical properties. It summarizes previous research showing that yttrium stabilized zirconia (YSZ) and titanium dioxide (TiO2) nanoparticles increase corrosion resistance and hardness. The document then describes experiments by Tec Star testing different nanoparticles, concentrations, and current densities. It finds that YSZ nanoparticles provide the best mechanical and morphological properties at medium and high current densities. TiO2 improves properties at low densities but harms surface finish. Both YSZ and TiO2 increase corrosion resistance in salt fog tests compared to standard zinc coatings.

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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 Zinc coating. 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 size improving the hardness of the coating. Other studies related to different galvanic coatings, i.e. Nickel, give improvement of chemical and mechanical properties using differents nanoparticles additive. For example: 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 and typology of nanoparticles (NP) used as 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 during deposition process. At the same time give bad resutls in surface finishing of Zinc coating. 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 best mechanical 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 but increase protection to red corrosion from the iron substrate. Best nanoparticles for corrosion resistance are TiO2 e YSZ. 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 Borghi borghi@tec-star.it TEC STAR Srl Viale Europa, 40 41011 Campogalliano (MO) - Italy Tel (+39)059.526845 Fax (+39)059.527000

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Nanocomposite Zinc Coating

  • 1. 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
  • 2. 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 Zinc coating. They increase corrosion resistance and hardness of galvanic coating.
  • 3. 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 size improving the hardness of the coating. Other studies related to different galvanic coatings, i.e. Nickel, give improvement of chemical and mechanical properties using differents nanoparticles additive. For example: SiO2, TiO2, Al2O3, ZrO2, SiC, Cr2O3.
  • 4. 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 and typology of nanoparticles (NP) used as 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
  • 5. 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
  • 6. 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
  • 7. 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 during deposition process. At the same time give bad resutls in surface finishing of Zinc coating. Morphology and mechanical properties
  • 8. 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 best mechanical and morhological properties. Morphology and mechanical properties
  • 9. 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
  • 10. 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 but increase protection to red corrosion from the iron substrate. Best nanoparticles for corrosion resistance are TiO2 e YSZ. Corrosion resistance test
  • 11. 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
  • 12. 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 Borghi borghi@tec-star.it TEC STAR Srl Viale Europa, 40 41011 Campogalliano (MO) - Italy Tel (+39)059.526845 Fax (+39)059.527000