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Acta Metall Sin  2020, Vol. 56 Issue (2): 137-147    DOI: 10.11900/0412.1961.2019.00237
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Corrosion Behavior of X80 Steel Welded Joint in Simulated Natural Gas Condensate Solutions
CHEN Fang,LI Yadong,YANG Jian,TANG Xiao,LI Yan()
School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, China
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Abstract  

Carbon steels are widely used as transportation pipelines in oil and gas fields and welding is one of the main ways of connecting pipeline steel. The welded joints are easily corroded due to the difference in composition, structure and properties of the various components. The effect of content of HAc, Cl-, ethylene glycol (MEG) and temperature (T) on the corrosion behavior of welded joint of X80 steel in a simulated natural gas condensate saturated with CO2 was studied by the orthogonal experimental design, weight loss experiment and electrochemical experiment. It is demonstrated that the corrosion rate of the welded joint is significantly higher than that of the base metal because of the formation of macroscopic corrosion galvanic cells, and the corrosion of the weld metal as an anode region is accelerated to become a weak link of the welded joint. The significance of the four factors on the corrosion process is: c(HAc)>T $\gg$c(Cl-)>c(MEG), c(HAc) and T are the main factors affecting the corrosion behavior, and c(Cl-) and c(MEG) are secondary factors. Base metal and weld metal corrosion tendencies increase with increasing temperature. Because ferrous acetate is less protective as a corrosion product, as the c(HAc) increases, the impedance of the base metal and weld metal decreases, and the corrosion rate increases. Based on the results of orthogonal experiments, a multivariate linear regression equation was established.

Key words:  X80 pipeline steel      welded joint      natural gas condensate      corrosion behavior     
Received:  24 July 2019     
ZTFLH:  TG172  
Fund: National Natural Science Foundation of China(41676071);Fundamental Research Funds for the Central Universities(18CX05021A)
Corresponding Authors:  Yan LI     E-mail:  yanlee@upc.edu.cn

Cite this article: 

CHEN Fang,LI Yadong,YANG Jian,TANG Xiao,LI Yan. Corrosion Behavior of X80 Steel Welded Joint in Simulated Natural Gas Condensate Solutions. Acta Metall Sin, 2020, 56(2): 137-147.

URL: 

https://www.ams.org.cn/EN/10.11900/0412.1961.2019.00237     OR     https://www.ams.org.cn/EN/Y2020/V56/I2/137

Fig.1  Microstructures of X80 welded joint (WJ) (F—ferrite, AF—acicular ferrite, PF—polygonal ferrite, LB—lath bainite, GB—granular bainite, M-A—martensite-austenite)(a) base metal (BM) (b) weld metal (WM) (c) coarse grained heat affected zone (CGHAZ)(d) fine grained heat affected zone (FGHAZ) (e) intercritical heat affected zone (ICHAZ)

No.

Mass fraction / %

T / ℃

Corrosion rate / (g·m-2·h-1)
c(Cl-)c(HAc)c(MEG)
BMWJ
11.000300.4210.547
21.00.1010400.8530.984
31.00.3020501.0001.390
41.00.5030601.5502.190
53.0020400.3250.350
63.00.1030300.2930.500

7

3.00.300601.9402.390
83.00.5010502.0503.530
95.0030500.3150.315
105.00.1020300.9961.170
115.00.3010600.9781.410
125.00.500400.3340.623
137.0010600.6350.725
147.00.100501.1401.550
157.00.3030400.5990.700
167.00.5020300.9201.560
Table 1  Orthogonal results and analysis of the BM and WJ
SpecimenSource of varianceSum of squareDFMean squareF
BMModel2.1521.075.54
Error2.52130.19
Total4.6715
WJModel5.8222.916.77
Error5.58130.43
Total11.415
Table 2  Equation significant variance analysis table
Fig.2  Open circuit potentials (EOCP) of BM (a) and WM (b) in simulated natural gas condensate at different temperatures
Fig.3  EIS of BM (a) and WM (b) in simulated natural gas condensate at different temperatures
Fig.4  Equivalent circuit for fitting EIS data (Rs—solution resistance, Rp—polarization resistance, RL—inductive resistance, L—inductance, Cdl—double layer capacitance)

Specimen

T

Rs

Ω·cm2

Cdl

μF·cm-2

n

Rp

Ω·cm2

RL

Ω·cm2

L

H·cm-2

BM303.15200.84135.0292.0312.4
402.76920.8578.7234.1121.3
502.812200.8424.662.714.1
602.732100.7811.623.62.1
WM304.41640.85304.2
403.82150.84151.4--
503.23090.82110.0--
603.04400.8359.0--
Table 3  Fitting data of EIS of BM and WM in simulated natural gas condensate at different temperatures
Fig.5  Potentiodynamic polarization curves of BM (a) and WM (b) in simulated natural gas condensate at different temperatures
SpecimenT / ℃ba / mVbc / mVicorr / (mA·cm-2)Ecorr / V
BM30401620.111-0.544
40502310.304-0.559
50772760.976-0.575
60832432.562-0.594
WM30891720.058-0.593
40801520.085-0.598
50771810.145-0.597
60731520.246-0.618
Table 4  Fitting data of potentiodynamic polarization curves of BM and WM in simulated natural gas condensate at different temperatures
Fig.6  Open circuit potential of BM (a) and WM (b) in simulated natural gas condensate in different concentrations of HAc (c(HAc))
Fig.7  EIS of BM (a) and WM (b) in simulated natural gas condensate in different concentrations of HAc

Specimen

c(HAc)

%

Rs

Ω·cm2

Cdl

μF·cm-2

n

Rp

Ω·cm2

RL

Ω·cm2

L

H·cm-2

BM04.37650.79181663572
0.104.04730.83172369481
0.304.25550.82152371378
0.503.15250.84136321288
WM04.61240.86510--
0.104.41760.8548832561692
0.304.41640.8530437202620
0.504.96460.79208725910
Table 5  Fitting data of EIS of BM and WM in simulated natural gas condensate in different concentrations of HAc
Fig.8  Potentiodynamic polarization curves of BM (a) and WM (b) in simulated natural gas condensate in different concentrations of HAc
Specimenc(HAc) / %ba / mVbc / mVicorr / (mA·cm-2)Ecorr / V
BM05810630.0944-0.667
0.10502470.1513-0.572
0.30472030.1469-0.559
0.50401620.1113-0.544
WM0649970.0089-0.685
0.10881860.0355-0.602
0.30851530.0330-0.589
0.50891720.0580-0.593
Table 6  Fitting data of potentiodynamic polarization curves of BM and WM in simulated natural gas condensate in different concentrations of HAc
Fig.9  Macroscopic corrosion morphologies of X80 steel WJ(a) front view (b) side view
Fig.10  Corrosion rates of BM (a) and WJ (b) of X80 steel in simulated natural gas condensate at different temperatures
Fig.11  Corrosion rates of BM (a) and WJ (b) of X80 steel in simulated natural gas condensate in different concentrations of HAc
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