摘要
GH907高温合金在飞机、船舶等行业得到了广泛的应用。GH907高温合金在海洋环境中使用时会导致腐蚀的发生,因此对其腐蚀行为进行研究是必要的。使用中性盐雾试验方法,研究了GH907高温合金材料在模拟海洋环境中的腐蚀行为。通过扫描电镜、X射线能谱仪(EDS)和3D激光共聚焦等方法,观察GH907高温合金腐蚀后的二维、三维形貌并进行了成分分析;通过动电位扫描和电化学阻抗谱的电化学测试,分析其电化学腐蚀行为。结果表明:GH907材料在中性盐雾腐蚀过程中会发生钝化行为,腐蚀后的GH907腐蚀电流密度增加,耐蚀性下降,腐蚀产物和钝化膜对材料的保护能力有限。腐蚀类型以点蚀为主,EDS结果显示点蚀坑内腐蚀产物以Fe的氧化物为主,Ni、Co元素含量很低。腐蚀过程中同时存在电荷转移与扩散行为,腐蚀体系为活化控制体系。
GH907 superalloy has been widely used in aircraft,ship and other industries.Because GH907 superalloy will be corroded when used in marine environment,it is necessary to study its corrosion behavior.In this work,the corrosion behavior of GH907 superalloy material in simulated marine environment was studied by neutral salt spray test.The 2D and 3D morphology of GH907 superalloy after corrosion were observed by means of scanning electron microscope(SEM),X-ray energy dispersive spectroscopy(EDS)and 3D confocal laser scanning,and the composition of GH907 superalloy was analyzed.Moreover,the electrochemical corrosion behavior of GH907 superalloy was analyzed through electrochemical tests of potentiodynamic scanning and electrochemical impedance spectroscopy.Results showed that GH907 material would un-dergo passivation behavior during neutral salt spray corrosion.After corrosion,the corrosion current density of GH907 increased,the corrosion resistance decreased,and the corrosion products and passivation film possessed limited ability to protect the material.Furthermore,the main corrosion type was pitting corrosion.EDS results revealed that the corrosion products in the pitting pits were mainly Fe oxides,with very low Ni and Co element contents.Besides,the charge transfer and diffusion behavior existed in the corrosion process,and the corrosion system was an activation control system.
作者
刘天
杨国昊
张露
孙海静
孙杰
LIU Tian;YANG Guohao;ZHANG Lu;SUN Haijing;SUN Jie(School of Environmental and Chemical Engineering,Shenyang Ligong University,Shenyang 110159,Ch ina)
出处
《材料保护》
CAS
CSCD
2024年第2期43-50,共8页
Materials Protection
