A Corrosion Sensor for Monitoring the Early-Stage Environmental Corrosion of A36 Carbon Steel

作者：Chen Dong^*; Yen Max; Lin Paul; Groff Steve; Lampo Richard; McInerney Michael; Ryan Jeffrey

来源：Materials, 2014, 7(8): 5746-5760.

DOI：10.3390/ma7085746

• carbon steel
• chloride
• X-ray diffraction
• rust
• corrosion monitoring

An innovative prototype sensor containing A36 carbon steel as a capacitor was explored to monitor early-stage corrosion. The sensor detected the changes of the surface- rather than the bulk- property and morphology of A36 during corrosion. Thus it was more sensitive than the conventional electrical resistance corrosion sensors. After being soaked in an aerated 0.2 M NaCl solution, the sensor's normalized electrical resistance (R/R-0) decreased continuously from 1.0 to 0.74 with the extent of corrosion. Meanwhile, the sensor's normalized capacitance (C/C-0) increased continuously from 1.0 to 1.46. X-ray diffraction result indicates that the iron rust on A36 had crystals of lepidocrocite and magnetite.

• 出版日期2014-8