Detection of iron corrosion by terahertz time-domain spectroscopy

摘要

The iron tablets, which were exposed in salt spray with different periods, were investigated in the 0.2～2.0 THz using reflection-type terahertz time-domain spectroscopy (THz-TDS) in vacuum environment at room temperature. The sample signals are attenuated in comparison to the reference signals with increasing the corrosion time. The THz spectroscopy peak E_P and reflectivity (R) of samples strongly depended on corrosion time t with E_P ∝t(-1) and R ∝t~1. The THz characteristics of iron sheets in salt spray indicate that reflection THz-TDS will contribute to the development of non-destructive testing of corrosion in pipelines.