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| Study on Galvanic Corrosion Behavior of Copper Alloys in Simulated Deep Sea Low-temperature Environment |
| Received:November 28, 2014 Revised:April 15, 2015 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2015.02.001 |
| KeyWord:B10 alloy Ni-Al bronze deep sea environment galvanic corrosion electrochemical behavior |
| Author | Institution |
| XING Qing |
1. School of Material Science and Engineering， Jiangsu University of Science and Technology， Zhenjiang ，China; 2. State Key Laboratory for Marine Corrosion and Protection， Luoyang Ship Material Research Institute，Qingdao ， China; |
| GUO Wei-min |
State Key Laboratory for Marine Corrosion and Protection， Luoyang Ship Material Research Institute，Qingdao ， China; |
| CHEN Xiang-xi |
1. State Key Laboratory for Marine Corrosion and Protection， Luoyang Ship Material Research Institute，Qingdao ， China;2. College of Electromechanical Engineering， Qingdao University of Science and Technology， Qingdao ， China; |
| FAN Lin |
State Key Laboratory for Marine Corrosion and Protection， Luoyang Ship Material Research Institute，Qingdao ， China; |
| GONG Li-hua |
School of Material Science and Engineering， Jiangsu University of Science and Technology， Zhenjiang ，China; |
| YANG Chao |
Institute of Materials Science and Engineering Research， Ocean University of China, Qingdao ， China |
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| Abstract: |
| Objective To study the behavior of galvanic corrosion in simulated deep sea low-temperature environment of the copper alloys. Methods The galvanic potential and galvanic current of the seawater pipe material B10 alloy commonly used in the ships and the pump valve material nickel-aluminum bronze were monitored, and their galvanic corrosion rate and coefficient were calculated, to evaluate their sensitivity to galvanic corrosion. Finally, the influence of temperature on the galvanic corrosion behavior of the copper alloys was discussed in combination with potentiodynamic polarization measurements. Results As the result of coupling, B10 alloy acting as the coupled cathode was prevented from corrosion, while nickel aluminum bronze became the sacrificial anode with accelerated corrosion. Meanwhile, both the galvanic corrosion effect and the galvanic corrosion rate of the coupled copper alloys were low at the low temperature of the simulated deep sea environment, showing insignificant galvanic corrosion sensitivity. Conclusion On one hand, the decrease of seawater temperature could resist the occupation of cation vacancies or the replacement of Cu ions of Cu2O film formed on B10 alloy by Ni ions, and reduce the film potential, meanwhile, it could slow down the Al-removing corrosion of nickel-aluminum bronze, and subsequently reduce the difference of null-circuit potentials of the pair, leading to the attenuation of galvanic corrosion effect. On the other hand, lower temperature could also slow down the migration of cations to the solution matrix, resulting in accumulation of corrosion products on the surface of the electrodes and inhibition of anodic dissolution, besides, it could greatly decrease the diffusion rate of oxygen, resulting in increased reaction resistance and decreased galvanic corrosion rate. |
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