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| Adaptability Research of Typical Bolt/Nut Assembly Parts in Humid and Hot Marine Atmospheric Environment |
| Received:March 21, 2021 Revised:May 19, 2021 |
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| DOI：10.7643/issn.1672-9242.2021.11.021 |
| KeyWord:bolt/nut assembly part outdoor exposure test galvanic corrosion torque |
| Author | Institution |
| ZHANG Shi-yan |
Southwest Institute of Technology and Engineering, Chongqing |
| ZHANG Lun-wu |
Southwest Institute of Technology and Engineering, Chongqing |
| YANG Xiao-kui |
Southwest Institute of Technology and Engineering, Chongqing |
| WU Shuai |
Southwest Institute of Technology and Engineering, Chongqing |
| ZHOU Kun |
Southwest Institute of Technology and Engineering, Chongqing |
| FU Zhao-xu |
Southwest Institute of Technology and Engineering, Chongqing ;Hainan Materials Corrosion in Atmospheric Environment, National Observation & Research Station, Wanning , China |
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| Abstract: |
| To study the adaptability of typical bolt/nut assembly parts in humid and hot marine atmospheric environment. The outdoor exposure test of bolt/nut was carried out in Wanning atmosphere environment test station for 24 months. The corrosion behavior and torque variation law of bolt/nut assembly in humid and hot marine atmospheric environment were studied by environmental scanning electron microscope (SEM), electrochemical and torque test. The galvanic corrosion current corresponding to assembly A(30CrMnSiA cadmium plating passivation bolt and 30CrMnSiA cadmium plating passivation nut), assembly B (30CrMnSiA cadmium plating passivation bolt and 30CrMnSiA zinc plating passivation nut), assembly C (30CrMnSiA cadmium plating passivation bolt and 0Cr16Ni6 passivation nut) was about 0.6, 37, 100 µA respectively, the screw torque of assembly C under assembly state increased by 53% after 24 months of outdoor exposure. The performance of bolt/nut fastener was obviously influenced by the galvanic corrosion effect caused by assembly. There was no corrosion of 30CrMnSiA cadmium plated passivation bolt in non-assembly state during outdoor exposure in Waning, while assembly C under assembly condition had more serious matrix corrosion, which caused an increasing trend of the maximum torque during outdoor exposure test. |
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