| XIA Jiang-min,LI Zhu-ying,WANG Xiao-qiang,CHEN Ye-xing,LIN Yu-feng.Study on Erosion and Corrosion Behavior and Protection of Steel in Flowing Artificial Seawater[J],50(11):306-312 |
| Study on Erosion and Corrosion Behavior and Protection of Steel in Flowing Artificial Seawater |
| Received:January 27, 2021 Revised:April 07, 2021 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2021.11.032 |
| KeyWord:steel corrosion mechanism erosion corrosion pitting corrosion electrochemical noise |
| Author | Institution |
| XIA Jiang-min |
College of Naval Architecture & Ocean Engineering, Naval Univ. of Engineering, Wuhan , China |
| LI Zhu-ying |
College of Naval Architecture & Ocean Engineering, Naval Univ. of Engineering, Wuhan , China |
| WANG Xiao-qiang |
College of Naval Architecture & Ocean Engineering, Naval Univ. of Engineering, Wuhan , China |
| CHEN Ye-xing |
College of Naval Architecture & Ocean Engineering, Naval Univ. of Engineering, Wuhan , China |
| LIN Yu-feng |
College of Naval Architecture & Ocean Engineering, Naval Univ. of Engineering, Wuhan , China |
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| Abstract: |
| This paper aims to study the erosion and corrosion behavior of steel in flowing artificial seawater and its protection methods. Self-made scour test platformwas adopted, methods of scanning electron microscopy, electrochemical impedance, electrochemical noise, maximum entropy transformation were used to analyze the erosion and corrosion behavior characteristics of steel in flowing artificial seawater at various stages, and it was verified that the surface of the materialcoated with a new oxygen coating method could improve the effectiveness of steel against erosion and corrosion by flowing artificial seawater. The erosion corrosion behavior of steel in 2 m/s flowing artificial seawater for 30 days can be divided into three stages:In the first stage, the metal began to undergo pitting corrosion and formed networked corrosion products, and the reaction resistance continued to decrease to 400 Ω, The electrochemical noise potential had a negative shift, the value of SE was larger, the electrochemical corrosion rate was enhanced; In the second stage, the pitting corrosion rate was weakened, and granular corrosion products began to appear, the reaction resistance was relatively stable at about 300 Ω, and the electrochemical noise potential had a positive shift. The value of SE was small, and the rate of electrochemical corrosion remained relatively stable; In the third stage, the corrosion products of the outer layer peeedl off, and the reaction resistance and the value of SE fluctuated greatly, and the erosion effect leaded to the rapid formation and separation of corrosion products. The total resistance of the steel sample coated with an insulating coating was stable at about 6.0×105 Ω, which was two orders of magnitude higher than the total resistance 1.0×103 Ω of the uncoated bare sample. The erosion corrosion behavior of steel in 2 m/s artificial seawater for 30 days can be divided into three stages:accelerated corrosion-dynamic equilibrium-equilibrium destruction. The new epoxy coating has good erosion corrosion resistance. |
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