| 铍青铜弹簧片应力腐蚀开裂分析 |
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| 引用本文： | 刘德林,李春光,陶春虎,何玉怀,李莹.铍青铜弹簧片应力腐蚀开裂分析[J].腐蚀与防护,2012(5):452-455. |
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| 作者姓名： | 刘德林 李春光 陶春虎 何玉怀 李莹 |
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| 作者单位： | 北京航空材料研究院,中国航空工业集团公司失效分析中心,中航(试金石)检测科技有限公司;中国民航科学技术研究院 |
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| 摘 要： | 微动开关的弹簧片在使用过程中发生开裂。对弹簧片进行了裂纹形貌观察、能谱成分分析、金相组织检查和硬度检测,并对完好弹簧片进行了模拟试验。结果表明,弹簧片裂纹为应力腐蚀开裂;造成弹簧片应力腐蚀开裂的腐蚀介质来源于微动开关长接触片及传感器插座焊点部位残留的氯化铵钎剂。通过采用氯化锌+甘油替代含氯化铵的钎剂,弹簧片的应力腐蚀开裂得到了有效预防。
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| 关 键 词： | 铍青铜 弹簧片 应力腐蚀 |
Analysis of Stress Corrosion Cracking of Beryllium Bronze Spring Flake |
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| LIU De-lin,LI Chun-guang,TAO Chun-hu,HE Yu-huai,LI Ying.Analysis of Stress Corrosion Cracking of Beryllium Bronze Spring Flake[J].Corrosion & Protection,2012(5):452-455. |
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| Authors: | LIU De-lin LI Chun-guang TAO Chun-hu HE Yu-huai LI Ying |
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| Affiliation: | 1.Failure Analysis Center of AVIC,Beijing Institute of Aeronautical Materials,AVIC Touchstone Testing Innovation Cooperation,Beijing 100095,China;2.China Academy of Civil Aviation Science and Technology,Beijing 100028,China) |
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| Abstract: | The spring flake of a sensitive switch cracked during working.Appearance observation,energy spectrum analysis,microstructure inspection and hardness testing were performed.Then simulated testing for intact spring flake was carried out.The results show that the crack of spring flake is stress corrosion crack.The corrosion medium derived from the remaining flux containing NH4Cl at the welding point belween long contact flake and socket.By using ZnCl2 and glycerin to substitute as flux containing NH4Cl,the cracking of the spring flake has been effectively prevented. |
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| Keywords: | beryllium bronze spring flake stress corrosion |
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