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Journal of Chinese Society for Corrosion and protection  2015, Vol. 35 Issue (3): 227-232    DOI: 10.11902/1005.4537.2014.089
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Effect of Temperature on Corrosion Behavior of X80 Pipeline Steel in Acidic Soil
Shuang YANG1,2,Nan TANG3,Maocheng YAN1(),Kangwen ZHAO2,Cheng SUN1,Jin XU1,Changkun YU1
1. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. College of Environment and Chemical Engineering, Shenyang Ligong University, Shenyang 110016, China
3. Electric Power Research Institute of Jiangxi Province, State Grid Corporation, Nanchang 330096, China
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Abstract  

Corrosion of X80 pipeline steel in an acidic red soil collected from Yingtan area of Southeast China was studied in a temperature range 20~75 ℃ by electrochemical impedance spectroscopy (EIS). Theory concerning corrosion dynamics and transition state was applied to analyze the process and kinetics of the corrosion reaction. The results show that EIS of X80 steel in the red soil contains a capacitive arc related with soil at the high frequency region and a capacitive arc from the interface process at low frequency region. With increasing temperature, the soil resistivity and charge transfer resistance decrease, and the corrosion rate increases. Kinetics analysis shows that corrosion of X80 steel in the acidic red soil is an endothermic reaction system companied with decrease of disorder degree.
Key words:  pipeline steel      cathodic protection      acidic soil      EIS      kinetic analysis     
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Articles by authors
Shuang YANG
Nan TANG
Maocheng YAN
Kangwen ZHAO
Cheng SUN
Jin XU
Changkun YU

Cite this article: 

Shuang YANG,Nan TANG,Maocheng YAN,Kangwen ZHAO,Cheng SUN,Jin XU,Changkun YU. Effect of Temperature on Corrosion Behavior of X80 Pipeline Steel in Acidic Soil. Journal of Chinese Society for Corrosion and protection, 2015, 35(3): 227-232.

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https://www.jcscp.org/EN/10.11902/1005.4537.2014.089     OR     https://www.jcscp.org/EN/Y2015/V35/I3/227

Fig.1  Nyquist plots (a) and Bode plots (b) of X80 steel in the red soil at various temperatures
Fig.2  Equivalent circuit of EIS of X80 steel in the red soil at different temperatures
Fig.3  Fitting results of Nyquist plots of X80 steel in the red soil
Temperature ℃ Rs kΩcm2 Y0,s Scm-2s-n n1 Rct kΩcm2 Y0,dl Scm-2s-n n2
20 6.072 7.89×10-11 1 6.556 1.71×10-4 0.701
30 4.394 7.55×10-11 1 3.468 1.65×10-4 0.836
40 3.388 4.36×10-10 0.869 1.758 1.86×10-4 0.765
50 3.051 1.58×10-9 0.762 1.312 1.83×10-4 0.793
65 2.641 1.79×10-9 0.760 0.675 1.91×10-4 0.787
70 2.397 2.10×10-9 0.754 0.606 2.45×10-4 0.642
75 2.334 2.66×10-10 0.913 0.493 1.90×10-4 0.744
Table 1  Electrochemical parameters fitted from EIS data at different temperatures
Fig.4  Rs and Rct of X80 steel in the red soil as function of temperature
T / ℃ Ea kJmol-1 ΔG0 kJmol-1 ΔHa0 kJmol-1 ΔSa0 kJmol-1
20 38.95 65.45 36.52 ?0.0988
30 38.95 66.00 36.43 ?0.0976
40 38.95 66.32 36.35 ?0.0958
50 38.95 67.57 36.27 ?0.0969
65 38.95 68.71 36.14 ?0.0964
70 38.95 69.38 36.10 ?0.0970
75 38.95 69.75 36.06 ?0.0968
Table 2  Values of activation parameters for X80 steel in red soil
Fig.5  Arrhenius plot of lnRct-1vs 1/T for X80 steel in the red soil
Fig.6  ln(Rct-1/T) vs 1/T and the transition state plot
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