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Journal of Chinese Society for Corrosion and protection  2017, Vol. 37 Issue (4): 375-381    DOI: 10.11902/1005.4537.2016.065
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Effect of Ethylene Glycol on Corrosion Behavior of X65 Mild Steel in CO2-saturated 3.5%NaCl Solution
Xiu JIANG1(), Xiaoliang SONG1, Quan ZHANG2, Yan LIU1, Xize LIU1, Dingrong QU1
1 SINOPEC Research Institute of Safety Engineering, Qingdao 266071, China
2 College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
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Abstract  

The effect of 40% (mass fraction) ethylene glycol on the performance of CO2 saturated 3.5% (mass fraction) NaCl solution and relevant condensates was assessed by measurements of contact angle, pH and viscosity. Effect of 40% ethylene glycol on both top of line corrosion and bottom of line corrosion for X65 mild steel pipeline was investigated by means of weight loss, electrochemical method and scanning electron microscopy (SEM). Results indicated that contact angle, pH and viscosity of 3.5%NaCl solution saturated by CO2 and relevant condensates were increased due to the incorporation of 40% ethylene glycol at 35 ℃ and 1 atm. In the presence of solution of 3.5%NaCl or 3.5%NaCl+40% ethylene glycol, the pH value of the condensates formed on the top of line was lower than that on the bottom of pipeline. Due to the addition of 40% ethylene glycol to 3.5%NaCl solution, the deposition of corrosion products and pitting corrosion were accelerated, while the general corrosion rate of the bottom of pipeline was decreased. In fact, the general corrosion rate of the top of line for X65 mild steel pipeline was not obviously affected by 40% ethylene glycol, but the pitting corrosion was speeded up.
Key words:  ethylene glycol      condensate      CO2      top of line      bottom of line      corrosion     
Received:  20 May 2016     
ZTFLH:  TE988.2  
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These authors contributed equally to this work.
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Xiu JIANG
Xiaoliang SONG
Quan ZHANG
Yan LIU
Xize LIU
Dingrong QU

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Xiu JIANG, Xiaoliang SONG, Quan ZHANG, Yan LIU, Xize LIU, Dingrong QU. Effect of Ethylene Glycol on Corrosion Behavior of X65 Mild Steel in CO2-saturated 3.5%NaCl Solution. Journal of Chinese Society for Corrosion and protection, 2017, 37(4): 375-381.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.065     OR     https://www.jcscp.org/EN/Y2017/V37/I4/375

Fig.1  Schematic diagram of test system
Fig.2  Surface views of the electrode, showing water droplet formation during exposure in the gas phases of 3.5% NaCl solution (a, c, e, g) and 3.5%NaCl+40% ethylene glycol solution (b, d, f, h) at 35 ℃ for 10 min (a, b), 2.5 h (c), 3 h (d), 5 h (e, f), 21 h (g) and 23 h (h)
  
Solution Contact angledeg pH Viscosity mPas
3.5%NaCl 38.8 3.8 0.83
Condensate of 3.5%NaCl solution 43 3.6 0.77
3.5%NaCl+40% ethylene glycol solution 60.1 5.09 2.25
Condensate of 3.5%NaCl+40% ethylene glycol solution 64.7 3.91 0.95
  
Fig.3  Variations of corrosion rate of X65 mild steel with time in 3.5%NaCl solution and 3.5%NaCl+40% ethylene glycol solution at 35 ℃
Fig.4  Variations of corrosion rate of X65 mild steel in the gas and liquid phase with ethylene glycol concentrations in 3.5%NaCl solution at 35 ℃
Fig.5  SEM images of corrosion products (a, c) and metal surface after film removal (b, d) for X65 mild steel exposed in the gas phase of 3.5%NaCl solutions with 0% (a, b) and 40% (c, d) ethylene glycol at 35 ℃ for 24 h
Fig.6  SEM images of corrosion products (a, c) and metal surface after film removal (b, d) for X65 mild steel exposed in the liquid phase of 3.5%NaCl solutions with 0% (a, b) and 40% (c, d) ethylene glycol at 35 ℃ for 24 h
Mass fraction of ethylene glycol / % Water content% Impact factorF
0 100 1.00
10 90 0.84
30 70 0.57
40 60 0.44
50 50 0.33
70 30 0.15
90 10 0.03
Table 2  Variations of impact factor with ethylene glycol concentration
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