Corrosion Behavior Of Ni-Based Superalloy At High Temperature Corrosion Interaction With Low Temperature Corrosion

Corrosion of Compressor blades in planes or ships in marine environment is very serious. The previous investigation showed that both high temperature corrosion and low temperature corrosion took place in this failure process. Therefore, we design an accelerated simulation experiment suitable working conditions. We also use some analysis technology such as scanning electron microscopy/energy dispersive X-ray detector(SEM/EDX),X-ray diffraction etc., in conjunction with some electrochemical methods like polarization curves, electrochemical impedance spectroscopy measurement(EIS).The study for corrosion behavior of Ni-Based superalloy at high temperature corrosion interaction with low temperature corrosion, this can provide a reference to improve and enhance the corrosion resistance of aero-engine compressor blades.This paper studies corrosion behavior of GH4169at high temperature corrosion interaction with low temperature corrosion, that including without NaCl or deposition. when high temperature oxidation without NaCl deposition, the study shows that:High temperature oxidation and low temperature electrochemical interaction can impact morphology of the oxide film and accelerate corrosion of GH4169. The transmission of water in the oxide film makes the oxide film becomes porous, so that the oxide film lost protective properties. With the extension of the interaction cycle, the oxide film has poor corrosion resistance in3.5%NaCl.when high temperature oxidation with NaCl deposition, the study shows that:a little deposited NaCl on oxide film can be catastrophic damage and porous. The corrosion rate of the oxide film in3.5%NaCl solution with interactive cycle extended gradually increased, and electrochemical corrosion at low temperature has a huge impact on the interaction.