Hot corrosion damage mechanism of Ti6Al4V alloy in marine environment

Wu, Hulin; Gong, Ping; Hu, Suying; Xiang, Lin; Wang, Enlei; Xiao, Han; Wan, Yuanyuan; Haiqing, Ning; Xie, Zhiwen

doi:10.1016/j.vacuum.2021.110350

Cited by 13 publications

(4 citation statements)

References 22 publications

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“…During the whole test process, sample E2 showed a higher corrosion mass gain, but both samples showed a mass gain after the test. Compared with our previous study, destructive spalling occurred on the surface of Ti6Al4V after 200 h under the same test conditions, and the corrosion dynamics curve showed serious mass loss [6]. This indicated that there was no devastating corrosion degradation in the coating system of the two samples in this test and they could still protect the substrate, so the higher corrosion weight cannot indicate poor corrosion resistance of the sample.…”

Section: Resultsmentioning

confidence: 44%

“…Under the same test conditions, almost no complete oxide layers could be formed on the surface of Ti6Al4V substrate after 200 h of testing. The substrate was corroded seriously, resulting in the formation of a large area of corrosion holes [6]. In this test, the substrates of the two samples were not obviously corroded, indicating that the coatings of the two samples had a good protective effect on the substrates.…”

Section: Resultsmentioning

confidence: 74%

“…Titanium alloy, 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]. Although 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.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Hot Salt-Water Corrosion Resistance of NiCoCrAlY-AlSiY Coating by Ion-Beam-Assisted Deposition

Xue

Wang

et al. 2021

Coatings

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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.

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Section: Resultsmentioning

confidence: 44%

Section: Resultsmentioning

confidence: 74%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Enhanced Hot Salt-Water Corrosion Resistance of NiCoCrAlY-AlSiY Coating by Ion-Beam-Assisted Deposition

Xue

Wang

et al. 2021

Coatings

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“…For instance, some of the by-products that get generated from the combustion of low-grade oil fuels such as, Na2SO4, NaCl and V2O5, are highly corrosive [9]. Of these, NaCl causes the most intense hot corrosion damage in Ti-6Al-4V [10]. Prolonged exposure of the component to NaCl at temperatures ≥600 °C leads to the formation of a dense oxide scale over the alloy surfaces.…”

Section: Introductionmentioning

confidence: 99%