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| Application of Coupled Multieletrode Array Sensors in Corrosion Monitoring of Metal Buried in Soil |
| Received:October 10, 2019 Revised:November 27, 2019 |
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| DOI：10.7643/issn.1672-9242.2020.04.007 |
| KeyWord:buried metal corrosion monitoring stray current. cathodic protection |
| Author | Institution |
| SUN Dong-mei |
Beijing Polytech Inc, Beijing , China |
| SUN Xiao-dong |
Corr Instruments LLC, NV 89706, USA |
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| Abstract: |
| The paper aims to measure the corrosion rate of carbon steel buried in the soil with a coupled multielectrode array sensor.The corrosion probe was inserted into the saturated soil containing distilled water and 3.5% simulated seawater. The probe was raised during the measurement to measure the corrosion rate of metal in the saturated soil, near the water-air interface, and loose soil. The two probes were affected by stray current and cathodic production. One probe was kept under free potential. Three probes were inserted into the soil to measure the corrosion rate. The measurement results showed that the steady state corrosion rate measured in saturated soil containing sea distilled water and 3.5% simulated seawater was found to be approximately 2 to15 μm/a. The corrosion rate of metal in saturated soil containing sea eater was not higher than that of the saturated soil containing distilled water. However, the corrosion rate in a space filled with water was 2 orders of magnitude higher than those found in the densely packed soil saturated with water. It was demonstrated that the corrosion rate affected by stray current was increased by 2 magnitudes compared with the rate under free potential. Under the cathodic protection potential was -0.9 V, the corrosion rate was approximate to 0.01 μm/a, which is close to the lowest limit of CMAS system detection. The coupled multielectrode sensor can measure the corrosion rate of buried metal under different conditions effectively. |
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