| SHI Dapeng,QIAO Liang,DONG Jiwei,LU Taiyu,SONG Yang,JIA Binyuan,XIA Jinqi,WAN Qiang.Effect of Surface Passivation and MoS2 Coating on Mechanical and Corrosion Performance of 17-4PH Bolts in Salt Spray Environment[J],53(22):114-126 |
| Effect of Surface Passivation and MoS2 Coating on Mechanical and Corrosion Performance of 17-4PH Bolts in Salt Spray Environment |
| Received:December 07, 2023 Revised:March 11, 2024 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2024.22.010 |
| KeyWord:17-4PH bolts passivation coating MoS2 coating mechanical performance friction wear corrosion resistance |
| Author | Institution |
| SHI Dapeng |
Henan Aerospace Precision Manufacturing Co., Ltd., Henan Xinyang , China;Henan Key Laboratory of Fastening and Connection Technology, Henan Xinyang , China |
| QIAO Liang |
The Second Military Representative Office of Equipment Department of China PLA Air Force Stationed in Luoyang, Henan Luoyang , China |
| DONG Jiwei |
Henan Aerospace Precision Manufacturing Co., Ltd., Henan Xinyang , China |
| LU Taiyu |
Henan Aerospace Precision Manufacturing Co., Ltd., Henan Xinyang , China |
| SONG Yang |
Henan Aerospace Precision Manufacturing Co., Ltd., Henan Xinyang , China |
| JIA Binyuan |
Huazhong Agricultural University, College of Engineering, Wuhan , China |
| XIA Jinqi |
Huazhong Agricultural University, College of Engineering, Wuhan , China |
| WAN Qiang |
Huazhong Agricultural University, College of Engineering, Wuhan , China |
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| Abstract: |
| The indispensability of high-strength bolts in spacecraft systems is indisputable, given their pivotal role in ensuring the seamless operation and structural integrity of the entire system. However, the operational challenges posed by diverse spacecraft environments expose these critical components to corrosion, introducing the potential for component failures that, in turn, pose a significant threat to the overall safety and functionality of the system. Recognizing the severity of this issue, the research embarks on a comprehensive exploration of the performance of distinct surface coatings in a salt spray environment, with meticulous focus on evaluating the corrosion resistance of bolts. This study places particular emphasis on understanding how passivation treatment and MoS2 coatings influence the corrosion resistance and mechanical properties of bolts subject to the harsh conditions of a salt spray environment. In initiating this study, the deliberate choice of 17-4PH bolts was based on their widespread use in aerospace applications. By applying two prominent surface treatment methods-passivation and MoS2 coatings-it aims to draw nuanced insights into the effectiveness of these treatments under realistic operational conditions. With cutting-edge techniques such as SEM and EDS, the detailed characterization of corroded bolt surface coatings enabled a profound understanding of the underlying properties governing their performance. The subsequent execution of reciprocating friction tests added a crucial layer to the analysis, offering indispensable data on the friction coefficients (cof) of the surface-treated bolts. The extended duration of the salt spray corrosion experiments-spanning intervals of 0, 192, 580, 1 000, 1 800, 2 600, 3 750 and 6 500 h-allowed for a comprehensive examination of the evolving corrosion patterns on bolt surfaces. Scanning electron microscopy observations, complemented by EDS spectroscopy analysis, provided detailed insights into the structural changes and compositional variations occurring during the corrosion process. Moreover, the incorporation of standard tensile tests post-corrosion provided valuable information on the enduring mechanical integrity of the bolts subject to these challenging conditions. The experimental outcomes revealed significant revelations:the passivation layer exhibited a thickness of 10.7 μm, while the MoS2 coatings displayed a slightly thicker layer at 12.5 μm. The reciprocating friction tests following passivation highlighted an average cof of 0.85, underscoring the inherent challenges of this surface treatment in extreme environments. In stark contrast, the MoS2 coatings demonstrated remarkable efficacy, with an average cof of mere 0.2. Correspondingly, the cof for the bolts themselves were measured at 0.081 and 0.073 for passivation and MoS2 coatings, respectively. As the salt spray corrosion progressed, passivated bolts exhibited localized corrosion at the head and thread after 192 hours, intensifying into severe corrosion after 1 800 hours. Intriguingly, despite surface corrosion, the decline in bolt fracture strength was not pronounced. In sharp contrast, MoS2 coatings, while effective in preventing corrosion within the initial 3750 hours, showed significant peeling of the coatings at 6 500 h, signaling a limitation in its long-term protective capabilities. In summary, the findings underscore the superiority of MoS2 coatings over passivation in terms of a lower cof and more pronounced corrosion protection for bolts in a salt spray environment. The nuanced insights gained from the research contribute significantly to ongoing efforts to optimize bolt surface coatings, enhancing performance in extreme aerospace environments, and fortifying the reliability of spacecraft. This detailed examination not only sheds light on the intricate dynamics of surface treatments but also provides invaluable support for the future design and engineering of spacecraft components, ensuring their resilience and safety in the face of challenging operational conditions. |
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