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航天器用钛合金表面镀覆技术
陈学成1,程德1,佟晓波1,徐俊杰1,白晶莹1
北京卫星制造厂有限公司,北京 100094
摘要:
介绍了改进的钛合金镀覆前处理工艺,采用二次酸性浸锌的方法对钛合金进行活化,克服了钛合金表面易氧化造成的镀覆层结合不良的问题,并对比了不同磷含量对化学镀镍层结合性能的影响,在TC4及TA1钛合金表面制备得到了结合强度高的化学镀镍、镀金、镀银层。通过热震和划格法测试钛合金表面镀覆层与基体的结合强度;利用扫描电子显微镜(SEM)、能谱分析(EDS)、3D显微镜、金相显微镜等方法对镀层微观形貌和组成进行测试;并测试了镀层的电化学性能、镀银层的导电性以及镀金层的热辐射性能。实验结果表明:采用酸性浸锌溶液对钛合金进行活化,并以中磷镍作为底镀层,能够显著提高钛合金表面镀覆层的结合强度。化学镀镍层的腐蚀电位相对于钛合金基体提高了60 mV,镀金层的腐蚀电位则提高了600 mV。镀层的导电性、热控性能等都较基体钛合金有明显的提高。
关键词:  钛合金  表面镀覆  浸锌  磷含量  镀层性能
DOI:10.12044/j.issn.1007-2330.2019.05.012
分类号:TQ153
基金项目:
Investigation of Plating Technology on Surface Titanium Alloy Spacecraft
CHEN Xuecheng1,CHENG De1,TONG Xiaobo1,XU Junjie1,BAI Jingying1
Beijing Spacecraft,Beijing 100094
Abstract:
A innovative technique named acid zinc dipping method was developed and applied to the pre-treatment process for electroplating on titanium alloy.The surface was activated and the problem of poor bonding strength at the interface was solved.For optimal performance of the metal coating,the effect of P contcent on bonding strength of electroless nickel coating was further investigated.After improved pre-treatment method and optimal process,electroless nickel,silver,gold coatings with high bonding strength were prepared respectively on the surface of TC4 and TA1 titanium alloys.The bonding strength of coatings was characterized by thermal shock test and cross cut test.The microstructure of coating was characterized by scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS),3D microscopy and metallographic examination.Moreover,electrochemical property,conductivity and thermal radiation performance of coatings were also measured.Results show that through employing acid zinc dipping pretreatment method and adding medium phosphorus electroless nickel coating as bottom layer,the bonding strength,corrosion resistance,conductivity and thermal control performance of coating are significantly improved.The corrosion potential of electroless nickel coating increases by 60 mV compared to that of titanium alloy substrate,and increases by 600 mV in case of gold coating.
Key words:  Titanium alloy  Surface plating  Zinc dipping  P contents  Property of coating