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| Protection Distance of Impressed Current System Rod-shaped Auxiliary Anode in Seawater Pipe |
| Received:March 13, 2017 Revised:June 15, 2017 |
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| DOI：10.7643/ issn.1672-9242.2017.06.008 |
| KeyWord:seawater pipe impressed current system rod-shaped auxiliary anode protection distance |
| Author | Institution |
| QI Yun-fei |
1.Qingdao NCS Testing & Corrosion Protection Technology Co., Ltd, Qingdao , China;2.Qingdao Research Institute for Marine Corrosion, Qingdao , China |
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| Abstract: |
| Objective To study corrosion protection rules of impressed current system bar-shaped auxiliary anode in different diameter seawater pipes based on the static and dynamic environments. Methods The marine environment of seawater pipes were simulated, the seawater pipe was protected with rod-shaped auxiliary anode and cathode and the protection potential on different position of the pipe was measured to obtain the rules of corrosion protection. Results In static test, the smaller the diameter, the shorter the maximum protection distance. When the pipe diameter was less than or equal to 100 mm, the rod-shaped anode almost did not work. This protection method was unsuitable. In dynamic test, in case the pipes of the same diameter, the greater the flow velocity, the worse the protection effect. But the influence was not significant. There was little different in protection distance when the flow velocity was between 2 m/s and 4m/s; in case of different pipe diameter, the result was also similar to that of static test. The smaller the diameter, the shorter the protection distance. Conclusion The protection distance of rod-shaped auxiliary anode is limited, and it is unsuitable for small diameter pipes. It needs to consider other ways to provide uniform protection effect of long distance for pipe. |
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