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Journal of Chinese Society for Corrosion and protection  2018, Vol. 38 Issue (5): 471-477    DOI: 10.11902/1005.4537.2017.202
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Gray Relationship Analysis on Corrosion Behavior of Super 13Cr Stainless Steel in Environments of Marine Oil and Gas Field
Yang LI, Chengyuan LI, Xu CHEN(), Jiaxing YANG, Xintong WANG, Nanxi MING, Zhenze HAN
School of Petroleum Engineering, Liaoning Shihua University, Fushun 113001, China
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Abstract  

The corrosion rate of super 13Cr stainless steel was measured by potentiodynamic polarization curves in different environments of marine oil and gas field. Then the relationship between the corrosion behavior of super 13Cr stainless steel with the concentration of Cl-, concentration of S2-, pH value and temperature was evaluated by means of grey relationship analysis. Results showed that the grey correlation degree of corrosion factors in the marine oil and gas environments could be ranked with a descending sequence as follows: concentration of Cl- (0.8223)>temperature (0.7704)>pH value (0.7646)>concentration of S2- (0.7595). The weight of the effect of each corrosion factor on the corrosion rate of super 13Cr stainless steel was analyzed by hierarchy process, which then could be ranked with a descending sequence as follows: concentration of Cl- (0.3905)>temperature (0.2761)>pH value (0.1953)>concentration of S2- (0.1381). The main factors of the marine oil and gas environment, which caused the corrosion failure of super 13Cr stainless steel, were the high concentration of Cl- and high temperature.
Key words:  marine oil and gas environment      super 13Cr stainless steel      corrosion rate      grayrelationship analysis     
Received:  27 November 2017     
ZTFLH:  TG142.71  
Fund: Supported by National Natural Science Foundation of China (51574147) and Education Fund Item of Liaoning Province (L2017LZD004)
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Articles by authors
Yang LI
Chengyuan LI
Xu CHEN
Jiaxing YANG
Xintong WANG
Nanxi MING
Zhenze HAN

Cite this article: 

Yang LI, Chengyuan LI, Xu CHEN, Jiaxing YANG, Xintong WANG, Nanxi MING, Zhenze HAN. Gray Relationship Analysis on Corrosion Behavior of Super 13Cr Stainless Steel in Environments of Marine Oil and Gas Field. Journal of Chinese Society for Corrosion and protection, 2018, 38(5): 471-477.

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https://www.jcscp.org/EN/10.11902/1005.4537.2017.202     OR     https://www.jcscp.org/EN/Y2018/V38/I5/471

Fig.1  Polarization curves of super 13Cr stainless steel in the solutions with the different values of Cl- concentration (a), S2- concentration (b), pH (c) and temperature (d)
Cl- concentration / molL-1 S2- concentration / molL-1 Temperature / ℃ pH value Icorr / μAcm-2 VL / mma-1
0.1 0 25 7 0.019 0.021
0.25 0 25 7 0.117 0.142
0.6 0 25 7 0.475 0.561
0.85 0 25 7 4.624 5.456
1.4 0 25 7 5.875 6.932
1.7 0 25 7 14.453 17.06
0 0.001 25 7 0.0018 0.002
0 0.005 25 7 0.0061 0.007
0 0.01 25 7 0.0316 0.037
0 0.05 25 7 0.3752 0.443
0 0.1 25 7 0.0296 0.035
0 0.15 25 7 0.0154 0.018
0.6 0 25 3 0.584 0.694
0.6 0 25 5 0.481 0.568
0.6 0 25 7 0.475 0.560
0.6 0 25 9 0.015 0.017
0.6 0 25 11 0.012 0.014
0.6 0 25 13 0.010 0.013
0.6 0 25 7 0.475 0.561
0.6 0 35 7 0.496 0.589
0.6 0 50 7 0.512 0.604
0.6 0 60 7 0.534 0.630
0.6 0 70 7 1.633 1.927
0.6 0 80 7 2.875 3.392
Table 1  Fitting data of the polarization curves of super 13Cr in different environment conditions
Corrosion factors Yi Y0
Cl- concentration S2- concentration Temperature pH value Corrosion rate
0.1983 0 0.7792 0.9655 0.0125
0.4959 0 0.7792 0.9655 0.0846
1.1901 0 0.7792 0.9655 0.3342
1.686 0 0.7792 0.9655 3.2506
2.7769 0 0.7792 0.9655 4.13
3.3719 0 0.7792 0.9655 10.1641
0 0.0759 0.7792 0.9655 0.0012
0 0.3797 0.7792 0.9655 0.0042
0 0.7595 0.7792 0.9655 0.022
0 3.7975 0.7792 0.9655 0.2639
0 7.5949 0.7792 0.9655 0.0209
0 11.3924 0.7792 0.9655 0.0107
1.1901 0 0.7792 0.4138 0.4135
1.1901 0 0.7792 0.6879 0.3384
1.1901 0 0.7792 0.9655 0.3336
1.1901 0 0.7792 1.2414 0.0101
1.1901 0 0.7792 1.5172 0.0083
1.1901 0 0.7792 1.7931 0.0077
1.1901 0 0.7792 0.9655 0.3342
1.1901 0 1.0909 0.9655 0.3509
1.1901 0 1.5584 0.9655 0.3599
1.1901 0 1.8701 0.9655 0.3753
1.1901 0 2.1818 0.9655 1.1481
1.1901 0 2.4935 0.9655 2.0209
Table 2  Equalization treatment results
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