Table of ContentsSQUID Measurements of the Rate of Hidden Corrosion Vanderbilt University Outline What is a SQUID Magnetometer? Superconducting Quantum Interference Device The Law of Biot and Savart Pickup Coil Distance Dewar MicroSQUID System Schematic SQUID Configurations When One Might Use SQUID NDE Magnetic Image of Cracks Adjacent to Rivets Notes SQUID Measurements of Corrosion Activity Three Types of Corrosion Corrosion Cell Sample 1 Active Pitting Corrosion Corrosion Cell Sample 2 Active Corrosion Corrosion Kinetics Active "Uniform" Corrosion Magnetic Field Strength verses Distance between the SQUID and Specimen Top Surface Magnetic Field Strength verses NaCl Concentration due to Hidden Active Corrosion Conclusions From Previous Studies Question Metal Loss over Time NCI SQUID System NCI SQUID System Drawing NCI SQUID System Picture 1 NCI SQUID System Picture 2 NCI SQUID System Picture 3 NCI SQUID System Picture 4 Pickup Coil NCI SQUID System Picture 5 Data Acquisition Difference Image 1: Corrosion Change vs. Time Difference Image 2 Corrosion Image 1: Corrosion Signal vs. Time Corrosion Image 2 Corrosion Fatigue and Corrosion Predictive Modeling Vanderbilt Work Plan Initial Sample Tests 2024-T3 7075-T6 Joined with 2024-T3 A/C 2445 Calibration of Magnetic Signals: Correlation of SQUID and Mass Loss SQUID Testing for Precorroded Joints Corrosion Versus Temperature Calibration of Magnetic Signals: Spatial effects in signal production Calibration of Magnetic Signals: Mechanism of signal production The Simplest Model More Realistic Models Summary Infinite Sheet Infinite Strip Parallel Boxes Electrical Interface Interface Calibration of Magnetic Signals: Effects of Inhomogeneities on Signal Generation Hardware Development |
Author: John P. Wikswo
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