In situ underfilm corrosion rate measurements by magnetic and electrochemical techniques

A novel magnetic approach is introduced to measure the corrosion rate of ba re and coated ferromagnetic materials. The corrosion of bare and acrylic-co ated cobalt is monitored in situ and in real-time by coupling electrochemic al impedance spectroscopy (EIS) and saturation magnetic moment measurements using a vibrating sample magnetometer (VSM). For the first time, the corro sion rate beneath a polymer coating is measured accurately in situ; additio nally, it is suggested that the VSM can be used to enhance the interpretati on of EIS data. (C) 2000 The Electrochemical Society. S1099-0062(00)02-019- 8. All rights reserved.