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| Changes in Properties of Ni18Co9Mo5 in Humid and Hot Marine Atmosphere and Sub-humid and Hot Acid Rain Atmosphere |
| Received:December 15, 2022 Revised:March 13, 2023 |
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| DOI：10.7643/issn.1672-9242.2023.08.020 |
| KeyWord:Ni18Co9Mo5 humid and hot marine atmosphere sub-humid and hot acid rain atmosphere atmospheric corrosion mechanical property |
| Author | Institution |
| SUN You-mei |
Southwest Institute of Technology and Engineering, Chongqing , China;Hainan Wanning National Field Scientific Observation Research Station for Material Corrosion in Atmospheric Environment,HainanWanning , China;CSGC Key Laboratory of Ammunition Storage Environmental Effects, Chongqing , China;Chongqing Key Laboratory of Environmental Effect and Protection, Chongqing , China |
| YANG Hua-ming |
Southwest Institute of Technology and Engineering, Chongqing , China;CSGC Key Laboratory of Ammunition Storage Environmental Effects, Chongqing , China |
| LI Jing-yu |
Southwest Institute of Technology and Engineering, Chongqing , China;Hainan Wanning National Field Scientific Observation Research Station for Material Corrosion in Atmospheric Environment,HainanWanning , China;CSGC Key Laboratory of Ammunition Storage Environmental Effects, Chongqing , China |
| WANG Ling |
Southwest Institute of Technology and Engineering, Chongqing , China;Hainan Wanning National Field Scientific Observation Research Station for Material Corrosion in Atmospheric Environment,HainanWanning , China;Chongqing Key Laboratory of Environmental Effect and Protection, Chongqing , China |
| LI Nian-lin |
Southwest Institute of Technology and Engineering, Chongqing , China;Hainan Wanning National Field Scientific Observation Research Station for Material Corrosion in Atmospheric Environment,HainanWanning , China;CSGC Key Laboratory of Ammunition Storage Environmental Effects, Chongqing , China |
| ZHANG Chen |
Southwest Institute of Technology and Engineering, Chongqing , China;Hainan Wanning National Field Scientific Observation Research Station for Material Corrosion in Atmospheric Environment,HainanWanning , China;CSGC Key Laboratory of Ammunition Storage Environmental Effects, Chongqing , China |
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| Abstract: |
| The work aims to study the corrosion behaviors and mechanical properties of Ni18Co9Mo5 in humid and hot marine atmosphere (Yongxing) and sub-humid and hot acid rain atmosphere (Chongqing). The Ni18Co9Mo5 was prepared by metal powder injection molding and exposed intypical atmospheric environment of Yongxing and Chongqing for 18 months. Then, the changes in properties of Ni18Co9Mo5 were studied by mechanical test machine, X-ray diffraction analysis, scanning electron microscope, energy spectrum analyzer and metallurgical microscope. The corrosion resistance of Ni18Co9Mo5 was poor, and the obvious corrosion appeared after 2 months of exposure in marine atmosphereand sub-humid and hot acid rain atmosphere. On the basis that the average relative humidity reached the critical humidity (80%), the corrosive media SO2 (sub-humid and hot acid rain atmosphere) and Cl– (marine atmosphere) intensified the early corrosion of Ni18Co9Mo5 metal materials.The corrosion products of Ni18Co9Mo5 after 18 months of exposure in Yongxing were loose and there were obvious cracks in the corrosion area and the tensile strength and impact energy decreased by about 43% and 60%.However, the tensile strength of Ni18Co9Mo5 after 18 months of exposure in Chongqing decreased by 15% and the impact energy was basically unchanged. The highly aggressive Cl- resulted in the pitting corrosion and the initiation and expansion of cracks in the humid and hot marine atmosphere, which accelerated the corrosion of Ni18Co9Mo5 matrix, reduced the effective bearing area and resulted in the decrease of mechanical properties. The corrosion degree and decrease of mechanical properties of Ni18Co9Mo5 in humid and hot marine atmosphere are more serious than those in sub-humid and hot acid rain atmosphere. |
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