Comparison of AC Corrosion of X80 Steel in Real Soil, Soil Extract Solution, and Simulated Solution
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JMEPEG https://doi.org/10.1007/s11665-020-05002-6
Comparison of AC Corrosion of X80 Steel in Real Soil, Soil Extract Solution, and Simulated Solution Boxin Wei, Jin Xu, Qingyu Qin, Qi Fu, Yunlong Bai, Changkun Yu, Cheng Sun, and Wei Ke (Submitted March 25, 2020; in revised form June 21, 2020) Corrosion of X80 steel induced by alternating current (AC) in acidic red soil (ARS), acidic red soilextracted solution (SES), and acidic red soil-simulated solution (SSS) has been investigated. Corrosion of the steel coupons is dramatically aggravated by AC. The kinetic relationship between the corrosion rate (CR) and the AC density (JAC) in the three testing media all follows a model function, CR= aJnAC + b. Grey relational analysis shows that the correlation coefficient between corrosion rates with JAC in SES and ARS is 0.614; however, the coefficient between those in SSS and ARS is only 0.484, which indicates that SES is more suitable for the evaluation of soil corrosion than SSS. Keywords
AC corrosion rate, Alternating current, Grey model, X80 pipeline steel
1. Introduction Soil corrosion of a metal refers to an electrochemical corrosion process in a soil environment, which is related to various factors such as soil type, pH, resistivity, moisture, microorganisms, and stray current (Ref 1-5). With the rapid development of the electric power, petroleum, and transportation industries, high-voltage alternating current (HVAC) transmission lines and electric railways often share the same rightof-way with buried pipelines due to limited space. A so-called public corridor is formed in this case, and alternating current (AC)-induced corrosion of buried steel may occur at the holidays in the coatings. AC corrosion has been widely studied and has always been considered to have a severe influence on the safety of oil/gas pipelines (Ref 6-9). Xu et al. (Ref 10) found that AC accelerated the corrosion of 16Mn steel in a simulated soil solution. The corrosion rate changes slightly when the AC density is less than 100 A/m2. Research by Goidanich et al. (Ref 11, 12) has shown that the corrosion of steel is dramatically aggravated by AC in a simulated soil solution. The corrosion rate is nearly twice as high as that without AC when an AC density of 10 A/m2 is applied. As the AC density increased to 500 A/m2, the corrosion rate was greater than Boxin Wei, Qingyu Qin, and Qi Fu, Liaoning Shenyang Soil and Atmosphere Material Corrosion National Observation and Research Station, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, Peoples Republic of China; and School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, Peoples Republic of China; and Jin Xu, Yunlong Bai, Changkun Yu, Cheng Sun, and Wei Ke, Liaoning Shenyang Soil and Atmosphere Material Corrosion National Observation and Research Station, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, Peoples Republic of China. Contact e-mails: [email protected], [email protected], and chengsun@
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