Anodizing Aluminum and Microstucture of a Steel Sprocket .

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Anodizing Aluminum and Microstucture of a Steel Sprocket. Ian Buchanan and Kris Magri Santa Clause Rosa Junior School ENGR 45, Younes Ataiiyan Dec 07, 2009. Ian Buchanan is a Structural Building major, planning to work in development.
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Anodizing Aluminum and Microstucture of a Steel Sprocket Ian Buchanan & Kris Magri Santa Rosa Junior College ENGR 45, Younes Ataiiyan Dec 07, 2009

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Ian Buchanan is a Civil Engineering major, planning to work in development Kris Magri is a Mechanical Engineering real who arrangements to work in apply autonomy Authors

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Purpose of Anodizing Photo by Ron Newman, Grow an aluminum oxide layer on the aluminum so it can be colored Corrosion and wear resistance Hardening (Type III) Color – corrective

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Overview Aluminum part drenched in corrosive electrolyte Apply electrical ebb and flow, DC, ~12V The part is the anode (+) (accordingly the name) Electrolysis and synthetic response happens Porous aluminum oxide layer develops on the aluminum Up to 3000 circumstances thicker than normally occuring Al 2 O 3 layer Dye goes into pores, brings about brilliant hues Place in bubbling water to seal pores

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Electrochemistry Electrolyte in Solution: Free particles ,conductive Sulfuric, oxalic, or phosphoric corrosive commonly utilized 15% arrangement of sulfuric corrosive (H 2 SO 4 ) our methodology Electrolysis: Extracts constituent components from arrangement Anode Evolution of oxygen 2Al + 3H 2 0  Al 2 0 3 + 6H + 6e - Cathode Evolution of hydrogen 6H 2 0 + 6e -  3H 2 (g) + 6OH -

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Pore development Acid electrolyte goes about as dissolvable for oxide Dissolves segments of obstruction oxide layer Oxide develops at metal/oxide interface Rate of development subject to ebb and flow, focus, temperature, voltage Hexagonal shape Photo from Artists Anodizing Aluminum, D. LaPlantz, 1988, p. 17

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Anodizing Setup Materials Aluminum thing (anode) Aluminum wire Aluminum sheet (cathode) Sulfuric Acid 15% Non-metal holder Power supply Distilled/de-ionized water Dye (RIT garments color) Baking pop Photo by Kris Magri

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Process Diagram by Kris Magri

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Anodizing Tank Photo by Ed Troxell Photo by Kris Magri

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Cathode plan Cathode no less than 1/3 the range of the part Experimental 1 st cathode huge and extremely far away, poor outcomes Radial cathode worked best

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Sealing Aluminum oxide changed over to hydrated frame Al 2 O 3  3H 2 O has more volume than Al 2 O 3 Clogs the pores Hot water seal: Boiling de-ionized water or steam Other fixing: nickel acetic acid derivation, cobalt acetic acid derivation (frosty), sodium or potassium dichromate (hot)

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Results Photo by Kris Magri

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Current Density 10-15 ASF (Amp •hr/ft 2 ) sought rate 4A for 20 min, part is 4.42 in 2  43.4 ASF 1A for 20 min, part is 4.42 in 2  10.8 ASF Poor outcomes at 4A yet great outcomes at 1A Rate of oxide thickening corresponding to momentum thickness up to some point Dissolution point – boundary layer being expelled quicker than new oxide layer being shaped

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More about Anodizing Type II This is the strategy we utilized .00007" to .001" oxide layer thickness Type III Low temp (50 degree) at higher ebb and flow (24 ASF) Over .001"

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Anodizing in General Other metals that can be anodized Titanium, magnesium, niobium, tantalum, tungsten, zirconium Ti uses impedance property of oxide film rather than color for shading History Anodizing created around 1917 with first US patent in 1925 (*AAA)

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Resources Aluminum: Properties and Physical Metallurgy, Edited by John E. Bring forth, American Society for Metals, 1984 Materials Science and Metallurgy, Herman W. Pollack, third Edition, Reston Publishing, 1981 Artists anodizing aluminum: The sulfuric corrosive process, David LaPlantz, Press de LaPlantz, 1988 Wikipedia Mr. Titanium Anodizing Aluminum, by Ron Newman

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