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| Effect of Surface Nanocrystallization on Fretting Corrosion Behavior of Zirconium Alloy |
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| DOI：10.7643/issn.1672-9242.2022.11.015 |
| KeyWord:zirconiumalloy ultrasonic surface rolling processing surfacenanocrystallization corrosion frettingcorrosion |
| Author | Institution |
| TANG Chen |
Nuclear Power Institute of China, Chengdu , China |
| ZHANG Wei |
Nuclear Power Institute of China, Chengdu , China |
| LI Zheng-yang |
Tribology Research Institute, Southwest Jiaotong University, Chengdu , China |
| CAI Zhen-bing |
Tribology Research Institute, Southwest Jiaotong University, Chengdu , China |
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| Abstract: |
| The morphology and microstructureof N36 zirconium (Zr) alloy surface nanocrystallization layer were studied. The frettingcorrosion mechanism of the surface nanocrystallization layer was analyzed. Ultrasonic surface rolling processing (USRP) was used to preparesurface nanocrystallization layer on Zr alloys.The effects of rolling speeds on the morphology, phase composition, roughness, hardness, electrochemical corrosion and fretting corrosion behavior of the surface nanocrystallization layer were studied. Results shows thatZralloyafter USRP present plastic deformation trace.The plastic deformation on the surface of Zr alloy leads to work hardening and increases the surface hardness.The electrochemical corrosion tests indicate that Zr alloy after USRP shows a lower corrosion current density compared with substrate.The wear depth and wear rate of Zr alloy after USRP is lower than thatsubstrate. The Zr alloy after USRP refinegrain and increase the number of grain boundary, which improving the activity of Zr alloy and beneficial to form passivation film. The wear mechanism of Zr alloy after USRP is the interaction of oxidation wear and abrasive wear. |
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