Lecture 12 Electrodeposition

Lecture 12 Electrodeposition - Electrochemical Processes...

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University of Utah Fundamentals of Microfabrication Electro Chemical Deposition: Principles, Methods and Applications Presented by Bruce K. Gale Courtesy of R.A. Gunasekaran Electrochemical Processes Electro Deposition Introduction Experimental Setup Importance of Electro Deposition Bath Formulations Electroless and Displacement Depositions Equilibrium Electrode Potentials Factors Affecting the Electrodeposits Micro and Nano-scale Structures Introduction What is Electro deposition? Electro deposition is the process of coating a thin layer of one metal on top of a different metal to modify its surface properties. Done to achieve the desired electrical and improve heat tolerance and for decoration. E.D. is a surface coating method that forms an adherent layer of one metal on another. Electroplating Setup M’ Power M + Plating Solution M + e - e - M + - I e
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Electroplating Applications Automotive parts Printed circuitry and electrical contacts General engineering components Gold-Silver wares and Jewelry Musical Instruments and Trophies Soft metal gaskets Anti-seize bearings Production of micro parts for MEMS Electroforming By depositing a metal into or on to a mold or mandrel, a free-standing metal object is made Electroforming is a process used for making metallic articles with tight dimensional tolerance Useful for the production of originals and making exact copies of originals - - Need for Electroforming Accuracy of reproduction Production of foils and mesh-products Screen-printing cylinders Manufacture of complex shaped objects Manufacture of large or small products Manufacture of molds Electroforming Applications Micro components and prostheses Complex wave guides Metal bellows Reflectors, Nose cones Heat exchangers, micro filters Decorative ware When combined with lithography, electroforming is extremely useful for making micro parts, and overcomes the difficulty of traditional machining
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LIGA Process X-rays Mask Resist Substrate Plating Mold Embossing µ -Structure Develop Resist Electrochemical Deposition Understanding the relationships between micro- structure and mechanical properties is one of the main goals of metallurgy and materials science. This allowed the tailoring of materials properties by varying the composition and the structure. The fascinating field of electro deposition allows one to tailor the surface properties of a material or to form the entire part by electroforming. To explore new materials for a variety of applications. Faraday’s Law The amount of electrochemical reaction that occurs at an electrode is proportional to the quantity of electric charge ( Q ) passed through the cell. The weight of a product of electrolysis is
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This note was uploaded on 11/16/2011 for the course MSE 5960 taught by Professor Douglas during the Fall '04 term at University of Florida.

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Lecture 12 Electrodeposition - Electrochemical Processes...

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