Anodisation process of surface coating is discussed alongwith real time application and case studies.

1. Anodisation
By,
Pavan G Pandit
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2. Agenda
• Anodisation of Aluminium(Visual)
• Features of Anodisation
• Anodisation process.
• Significance of TiO2 Anodisation
• Case Study.
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3. Features of Anodisation
• Galling can be reduced significantly.
• Increase wear resistance to some extent.
• Anodic film reduces the inward diffusion of oxygen at
elevated temperatures.
• Thicker TiO2 films withstand relatively higher loads.
• Deposition of low µ polymers alongwith anodising
increases hardness, lubricity and corrosion resistance.
• Anodisation can also be used to clean up the surface from
iron contaminants.
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4. Anodisation Process
• Requirements
• Platinum rings
• 9V batteries
• Battery snaps
• Empty margarine tub
• Scrap metal
• Electrolytic solution
• Coke or Pepsi
• White vinegar + Baking Soda
• Grape juice
• Any acidic solution
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5. Anodisation Process
• Procedure
• Connect the batteries in series.
• Connect the scrap material to the negative end
• Connect the titanium ring to the positive end
• Pour electrolyte into a tub
• Dip the electrodes into the electrolyte bath
• Bronze<Purple<Blue<Yellow<Pink<Turquiose
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6. Anodisation Process
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7. Why are the components
multicolored?
• Anodising Titanium adjusts the oxide level of metal surface.
• The adjustment of the oxide changes the spectrum of light, resulting in
perceived color.
• Controlling this level, an entire range of colors can be produced.
• Colors depend on the electrolytes and the voltage.
• Electrolytes are mostly
• 80%H3PO4 + 10%H2SO4+ 10%H2O
• 3-5%trisodium phosphate + distilled water
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8. Significance of TiO2 anodisation
• Titanium imparts hardness and color to surface. Imparts durability to the
component.
• Long lasting color to the parts without altering the mechanical properties.
• Titanium is fully resistant to chemical reactions associated with
microorganisms such as
• Ammonium
• Sulphides
• Nitrites
• Ferrous compounds
• Organo-sulphurs
• Ti6Al4V are used in medical implants.
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9. Significance of TiO2 anodisation
• Color coding helps in easy assemblage and reduces error.
• Color coding increases the ease, speed and accuracy of
assembly.
• Color coding allows instant recognition of parts when
time and accuracy are critical.
• Dental and orthopedic Implants, medical instruments can
be coded with standardised colors to increase the
efficiency during surgeries .
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10. Significance of TiO2 anodisation
• The integrity and properties of the base metal along
with its suitability in biomedical applications are not
compromised.
• The process is non-polluting and offers a wider range
of colors than conventional methods.
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11. Case Study
INVESTIGATIONS OF THE ANTIBACTERIAL
PROPERTY OF AN ANODISED TITANIUM ALLOY
JUDY GOPAL, P. MURALEEDHARAN, P. GEORGE, H.S.KHATAK
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12. Parameters
• Base metal:
• Anatase form of TiO2
• Anodised Ti6Al4V
• Bacterial culture:
• Pseudomonas bacterial culture
• Acid Bath:
• HNO3 400g/l + HF 40g/l
• Cleanser:
• Ethanol
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13. Parameters
• Working Temperature: 250C
• Orthophoshoric acid 30 g/l
• Voltage applied: 50V
• Time of exposure: 10mins
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14. Procedure
• The anodised specimen was subjected to adhesion studies
by exposing it to the nutrient culture of Pseudomonas
species under near-UV light illumination as well as dark
conditions.
• This exposure to radiations was carried out for 4days and
11days.
• Bacterial density was estimated using PLATE COUNT
TECHNIQUE(TVC & Epifluorescence µ-scopic obs).
• Direct microscopic observation is carried later.
• 0.1% Acridine orange indicator is used.
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15. Procedure
• When Acridine reacts with Double stranded nucleic
acid(DNA), it emits green fluorescence.
• When Acridine reacts with single stranded nucleic
acid(RNA), it emits orange-red fluorescence.
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16. Results of the analysis
• The bacterial attachment on the anodised samples
which were exposed to blacklight was much less than
that acid pickled.
• Presence of Anatase type of TiO2 was confirmed by
GISAXS with a peak value of 2θ = 25.30.
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17. References
• Trends biomater, Artif. Organs. Vol. 17 (1) pp 13-18
(2003)
• www.azom.com/article.aspx?ArticleID=2694(2016)
• http://www.electrohio.com/Finishing/TiAnodizing/
TiAnodizing.htm(2016)
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18. Any queries?
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19. Thank you
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