Micro electrochemical set up for local corrosion and electrochemical characterisation

    Project Details

    Description

    High performance demand for several engineering alloys and components, and miniaturization of electronics and development of MEMS requires better understanding of local corrosion characteristics frequently down to µm scale. This is because in metallic materials corrosion is a sensitive function of microstructure, in particular the local electrochemical activities of several microstructural heterogeneities such as second phase particles and grain boundaries. Corrosion of microelectronics circuits and MEMs is also a recent problem, which demands measurement resolution down to few microns as the components are extremely small, and measurement needs to be carried out without damaging the entire component.

    These limitations can be overcome by the use of so called micro electrochemical technique, which in various forms are being used by few investigators. A popular idea involves the use of a pipette connected to a system to control the solution flow at the tip. Through addition of reference and counter electrodes, the pipette system becomes a microscopic electrochemical cell, which can then be used with high precision to determine the electrochemical characteristics of the microstructural region of interest. The resolution of the technique is determined by the size of the pipette tip.

    Although this approach of measuring local electrochemical activity is attracting corrosion investigation, the equipment is not available commercially. This project aims to develop such a micro electrochemical set up at the division of Materials and process Technology at DTU.
    StatusFinished
    Effective start/end date01/11/200401/06/2005

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