|
| Failure Cause of Corrosion Perforation of a Certain type 20# Steel |
| Received:April 06, 2023 Revised:June 15, 2023 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2023.11.012 |
| KeyWord:20# steel corrosion failure sulfate reducing bacteria (SRB) electrochemical analysis microbial corrosion Raman spectrometer |
| Author | Institution |
| WANG Xin |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Shandong Qingdao , China |
| LIU Feng |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Shandong Qingdao , China |
| TONG Hong-tao |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Shandong Qingdao , China |
| BAI Shuang-feng |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Shandong Qingdao , China |
| SONG Qing-yuan |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Shandong Qingdao , China |
| LIU Pan |
Luoyang Ship Material Research Institute, Henan Luoyang , China |
| SUI Yong-qiang |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Shandong Qingdao , China |
| HOU Jian |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Shandong Qingdao , China |
|
| Hits: |
| Download times: |
| Abstract: |
| The work aims to analyze the cause of the failure by studying the failure section of the 20# steel pipe of a certain vessel after it is put into operation. The compliance and metallographic structure of materials were analyzed with an inductively coupled plasma emission spectrometer, a carbon and sulfur analyzer and a metallographic microscope. A field emission scanning electron microscopy (SEM) was used to observe the microscopic morphology of the corrosion pits, and the composition analysis of the corrosion products around the failure sites was carried out by X-ray diffraction and microscopic Raman spectroscopy. The causes and mechanism of corrosion were further determined by electrochemical test and microbial identification culture. The analysis of material compliance showed that the composition of the 20# steel pipe beam met the requirements of the standard. It was found in morphological observation that the edge of the 20# steel pit was stepped, with obvious climbing phenomenon, and the pit was black around. The results of X-ray energy spectrometer showed that there was a large amount of sulfur on the inner surface of 20# steel, and it was found by Raman analysis and XRD analysis that sulfur elements mainly existed in the form of sulfate and sulfide. The electrochemical test results showed that the corrosion rate of 20# steel was increased obviously in the solution containing sulfide. Further microbial culture of the corrosion products revealed the presence of sulfate reducing bacteria. Therefore, microbial corrosion is the main cause of perforation of 20# steel pipe. |
| Close |
|
|
|