Effects of Alternating Current (AC) Frequency on Corrosion Behavior of X80 Pipeline Steel in a Simulated Acid Soil Solution

doi:10.11902/1005.4537.2013.127

Journal of Chinese Society for Corrosion and protection

2014, Vol. 34

Issue (3): 225-230 DOI: 10.11902/1005.4537.2013.127

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Effects of Alternating Current (AC) Frequency on Corrosion Behavior of X80 Pipeline Steel in a Simulated Acid Soil Solution

ZHU Min, DU Cuiwei(

), LI Xiaogang, LIU Zhiyong, WANG Liye

School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

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Abstract

The effect of frequency of the applied alternating current (AC) on corrosion behavior of X80 steel in an artificial liquid aiming to simulate the acid soil medium of Yingtan area was studied by means of electrochemical measurement, immersion test and surface characterization technique. The results showed that with the increasing AC frequency, the corrosion rate and the corrosion degree of X80 steel decreased gradually. The corrosion product of X80 steel under the applied AC was loose with many cracks thus could not offer proper protection to the substrate. The offset of corrosion potential of X80 steel decreased as the AC frequency increases. With the increase of AC frequency, the oscillation amplitude of anode and cathode polarization curve gradually receded. In the range of the test frequency, the applied AC to X80 steel not only induced the increase of the current density for both anode and cathode, but also the change of cathode reaction from mixing control to activation control.

Key words: X80 steel AC frequency corrosion behavior corrosion rate

Received: 11 July 2013

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Cite this article:

ZHU Min, DU Cuiwei, LI Xiaogang, LIU Zhiyong, WANG Liye. Effects of Alternating Current (AC) Frequency on Corrosion Behavior of X80 Pipeline Steel in a Simulated Acid Soil Solution. Journal of Chinese Society for Corrosion and protection, 2014, 34(3): 225-230.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2013.127 OR https://www.jcscp.org/EN/Y2014/V34/I3/225

Fig.1

电化学测试用实验装置图

Fig.2

X80钢的金相组织

Fig.3

不同交流电频率作用下X80钢去除腐蚀产物后的微观形貌

Fig.4

不同交流电频率作用下X80钢的腐蚀速率

Fig.5

不同交流电频率作用下X80钢腐蚀产物形貌和EDS结果

Fig.6

交流电频率对X80钢腐蚀电位的影响

Fig.7

腐蚀电位的偏移量与交流电频率的关系曲线

Fig.8

不同交流电频率作用下X80钢的极化曲线

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