Corrosion of Silver-Cored Co-20Cr-35Ni-10Mo Composite for Networked Neuroprosthetic System

• Published in: Corrosion (Houston, Tex.) Vol. 67; no. 4; pp. 46002 - 46002-10
• Main Authors: HA, H. M, PAYER, J. H
• Format: Journal Article
• Language: English
• Published: Houston, TX NACE International 01.04.2011
• Subjects: Anodic dissolution; Applied sciences; Cables; Cathodes; Cathodic dissolution; Chloride; Cobalt base alloys; Corrosion; Corrosion effects; Corrosion environments; Corrosion potential; Corrosion products; Dissolution; Dissolving; Electrochemistry; Electrodes; Exact sciences and technology; Experiments; Heavy metals; Immersion tests (corrosion); Metal surfaces; Metals. Metallurgy; Morphology; Physiology; Prosthetics; Scanning electron microscopy; Signal processing; Silver; Silver chloride; Sodium chloride; Wire; Silver; silver chloride; silver corrosion; Chlorides; Galvanic corrosion; Composite material; networked neuroprosthetic
• ISSN: 0010-9312; 1938-159X
• DOI: 10.5006/1.3580566

Abstract Corrosion behavior of a silver-cored composite wire with Co-based alloy Co-20Cr-35Ni-10Mo outer tube and a silver core in vitro conditions was investigated. The electrochemical effect of the component materials on the overall corrosion behavior of the composite wire was elucidated. The formation of silver chloride corrosion product on the corroding silver core limited ionic transport therefore restricted further dissolution at the silver metal surface. Galvanic action between a Co-20Cr-35Ni-10Mo cathode and a silver anode was examined. Dissolution rate of the silver core in a composite wire obtained from immersion tests in a physiological solution of 9 g/L NaCl at 37°C was approximately 22 μm/y, i.e., 0.28 μg/y silver dissolved for a 37-μm-diameter silver core. Nearly all of the silver dissolved precipitate as silver chloride, i.e., approximately 0.37 μg/y.