Abstract
A promising ion-beam-assisted deposition (IBAD) method was developed to improve the salt-water corrosion resistance of NiCoCrAlY-AlSiY coating. During hot salt-water exposure, hydrochloric acid (HCl) was produced when chloride salt, water, and metal oxide reacted with each other, while HCl was also produced when chlorine reacted with water. The as-deposited AlSiY layer exhibited a loose texture accompanied by numerous pore defects, which triggered the multi-scale diffusion of HCl, resulting in the large-area corrosion degradation of the coating texture and the rapid diffusion of the NiCoCrAlY bonding layer. By contrast, the ion-beam-assisted AlSiY layer showed a dense texture that effectively inhibited the inner diffusion of HCl and suppressed the corrosion reactions as well as the diffusion of the NiCoCrAlY bonding layer. The current results confirmed the significant potential of IBAD in inhibiting corrosion damage and diffusion of thermal protective coatings.
Highlights
Given the continuous development of advanced aero-engines in recent years, thrust–weight ratio is one of the key performance factors of aero-engines
For these two composite coatings, the diffraction peaks detected by XRD were primarily located at the outermost side of the AlSiY layer, and the content of silicon and yttrium was less in the AlSiY layer, these strong diffraction peaks were assigned to the Al phases and the number of Si-phase diffraction peaks that could be detected is small and the intensity is low, while the Y
We found that when water vapor participated in the hot corrosion test, it would have a synergistic effect with salt at high temperature, leading to more severe corrosion degradation
Summary
Given the continuous development of advanced aero-engines in recent years, thrust–weight ratio is one of the key performance factors of aero-engines. As a light metal material, is widely used in aero-engines because of its advantages of low density and good corrosion resistance [2,3,4]. Titanium alloys exhibit certain thermal stability and corrosion resistance, when aero-engines are used in marine environments, they are affected by oxidation erosion as well as corrosion induced by hot salt mixtures and water vapor [5,6]. This process causes severe corrosion damage and degradation to the titanium alloy. From the perspective of marine corrosion prevention and aero-engine control, surface functional coating is currently one of the most economical and effective protection strategies
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
