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| Cathodic Protection Research of High-strength Steel Welding Line in Simulated Deep-sea Environment |
| Received:March 24, 2016 Revised:August 15, 2016 |
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| DOI：10.7643/ issn.1672-9242.2016.04.020 |
| KeyWord:simulated deep sea environment high-strength steel welding seam cathodic protection slow strain rate test hydrogen embrittlement |
| Author | Institution |
| GAO Xin-xin |
1.College of Mechanical and Electrical Engineering, Qingdao University of Science and Technology, Qingdao , China;2.Science and Technology on Marine Corrosion and Protection Laboratory, Luoyang Ship Materials Research Institute, Qingdao , China |
| GUO Jian-zhang |
College of Mechanical and Electrical Engineering, Qingdao University of Science and Technology, Qingdao , China |
| PAN Da-wei |
Science and Technology on Marine Corrosion and Protection Laboratory, Luoyang Ship Materials Research Institute, Qingdao , China |
| ZHANG Hai-bing |
Science and Technology on Marine Corrosion and Protection Laboratory, Luoyang Ship Materials Research Institute, Qingdao , China |
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| Abstract: |
| Objective To study the law of hydrogen embrittlement breaking for high-strength steel welding seam under cathodic polarization in sea water, and determine then a reasonable cathodic protection potential range can be determined. Methods By simulating the deep sea pressure environment, the author used slow strain rate tensile tests (SSRT), electrochemical measurement methods and corrosion weight loss test were adopted to study the law and, combined with the fracture morphology was observed by electron microscopy. Results The conclusions were drawn as follows: aAs cathodic protection potential shifted toward negative, shifting the protection degree of high-strength steel welding seam gradually increased under in simulated deep sea pressure environment at 4.50 MPa. When the polarization potential was applied at applied by -0.77V(vs Ag/AgCl/ sea water , the same below), the protection degree of the material get got to 90%. When it wasWithin at -0.71(Ecorr)~ -0.95 V potential range, high-strength steel welding seam was mainly subjected to ductile fracture. When the potentialit was applied at -1.00V, fracture morphology showed typical hydrogen embrittlement. When the polarization potentialit was positive than the potential of was not over -0.96 V, the hydrogen embrittlement coefficient of the material does did not exceed 25%. Conclusion There by the reasonable protection range of high-strength steel welding seam was determined at -0.77 ~ 0.96 V under deep -sea environment. |
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