Study On The Eis Corrosion Test System Of The Cable In The Suspension Bridge By Virtual Instrument Technology

According to the modern suspension bridge corrosion monitoring and testing status, and AC impedance technique and impedance test system development, virtual instrument technology, is booming, combined with AC impedance corrosion monitoring system to carry out research Suspension Bridge cable, It sis very important to master the corrosion of suspension bridge cable, to improve anti-corrosion methods to ensure normal operation and to avoid security incidentsThe AC impedance corrosion test system based on virtual instrument, The system consisted of three electrode sensor system, potentiostat, PCI-6259 card, PC composition. The control signal generated by data acquisition cards was superposed on potentiostat .The data sampled by data acquisition cards was processed , displayed and saved by computer. The system included a set of experimental parameters, data acquisition, data processing, graphic display, data storage ,it is portable, practical, cost-effective .Studied the determination and evaluation methods of the corrosion rate. It mainly use three ways to express the rate corrosion ,such as weight loss, depth, current density, etc. Author analysed the error sources of corrosion rate ,emphatically analyzed the error factors of suspension bridge cable's polarization resistance RP in AC impedance test , and provided some effective measures to reduce the error.The AC impedance corrosion test system based on virtual instrument could test suspension bridge cable's corrosion parameters during different environments, and get, suspension bridge cable's corrosion rate , which offered technology support to the study in corrosion behavior at atmospheric pollution , to improve the anti-corrosion technology.,.It also provide support in real-time monitoring and corrosion evaluation of modern suspension bridge cable.