Degradation mechanism of Ti-6Al-2Sn-4Zr-2Mo-Si alloy exposed to solid NaCl deposit at high temperature

Ciszak, Clément; Abdallah, Iman; Popa, Iolanda Valentina; Brossard, Jean-Michel; Put, Aurélie Vande; Monceau, Daniel; Chevalier, Sébastien

doi:10.1016/j.corsci.2020.108611

Cited by 30 publications

(9 citation statements)

References 44 publications

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“…18 . Although, according to Ciszak C et al 47 , many oxides can be observed according to theoretical calculations, in practice, TiO 2 , ZrO 2 , and Al 2 O 3 have been observed, but only TiO 2 was observed in this study.…”

Section: Resultscontrasting

confidence: 54%

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Effect of oxide layers formed by thermal oxidation on mechanical properties and NaCl-induced hot corrosion behavior of TC21 Ti-alloy

Ahmed

El-Zomor

Ghazala

et al. 2022

Sci Rep

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In the current study on TC21 Ti-alloy (6.5Al–3Mo–1.9Nb–2.2Sn–2.2Zr–1.5Cr), the thermal oxidation formed oxide layers that considerably influenced mechanical properties (hardness and wear). TC21 specimens were oxidized at 600, 700, 800, and 900 °C for 5, 20, and 50 h. NaCl-induced hot corrosion testing was carried out on raw (un-oxidized) and oxidized specimens at 600 and 800 °C for 50 h. The cyclic testing was performed at 600 °C for durations of 5, 10, 20, 30, 40, and 50 h. The average thickness of the layer grew with increasing oxidation time and temperature. A thin oxide layer (average 0.16 µm) was generated by oxidation at a temperature of 600 °C for a duration of 5 h, and at 800 °C, a large oxide layer of 10.8 µm thickness was formed. The most significant surface hardness of 1000 ± 150 HV0.05 was produced for the layer oxidized at 900 °C. On the other hand, the lowest hardness of 360 ± 150 HV0.05 was recorded for the raw materials. Best wear resistance had been achieved for specimens oxidized at 800 °C. During NaCl hot corrosion test, the weight loss of the raw specimen was 6.4 mg/cm2 due to the flaking off of the corrosion product. However, for specimens oxidized at 600 °C for 50 h, weight loss after corrosion testing was 0.54 mg/cm2, less than that of the specimen before corrosion. Oxidized specimens at 800 °C exhibited the best mechanical characteristics and corrosion resistance.

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Section: Resultscontrasting

confidence: 54%

“…Some chlorides might be attributed to exceptionally poor stability as Ti and Al chlorides. Several researchers have explored the corrosion mechanism in Ti alloys with NaCl [46][47][48][49] . An active corrosion process is considered responsible for reducing corrosion protection in the presence of NaCl deposits.…”

Section: Nacl Hot Corrosionmentioning

confidence: 99%

Effect of oxide layers formed by thermal oxidation on mechanical properties and NaCl-induced hot corrosion behavior of TC21 Ti-alloy

Ahmed

El-Zomor

Ghazala

et al. 2022

Sci Rep

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“…Substantial Sn contents were only found near the crack mouth, which might be attributed to the high volatility of SnCl 4 . Although corrosion products containing zirconium were not identified in this work, formation of zirconium oxychlorides and oxides were both observed in previous studies on NaCl-induced corrosion [12,46]. In terms of the activity of Zr and Mo, Ciszak et al pointed out that both Zr and Mo can react with Cl 2 and form corresponding chlorides/oxides at 560 °C based on theoretical thermodynamic modelling.…”

Section: Activities Of Alloying Elementsmentioning

confidence: 58%

“…So for laboratory fatigue testing under relatively low pressures, it has been suggested that pyrohydrolysis reactions are favoured over oxidation, giving rise to HCl formation [15,44]. Nevertheless, reaction (8) with chlorine gas is in principle thermodynamically favoured, especially at higher temperatures [45,46];…”

Section: Crack Propagationmentioning

confidence: 99%

AgCl-induced hot salt stress corrosion cracking in a titanium alloy

Shi

Joseph

Saunders

et al. 2020

Preprint

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The mechanism of AgCl-induced stress corrosion cracking of Ti-6246 was examined at 500 MPa and 380 °C for 24 h exposures. SEM and STEM-EDX examination of a FIB-sectioned blister and crack showed that metallic Ag was formed and migrated along the crack. TEM analysis also revealed the presence of SnO 2 and Al 2 O 3 corrosion products mixed into TiO 2 . The fracture surface has a transgranular and brittle appearance with cleavage-like cracking of the α phase. Long, straight and non-interacting dislocations were observed in a cleavage-fractured primary α grain, with basal and pyramidal traces. This is consistent with a dislocation emission view of the the cracking mechanism.

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“…The oxidation at 800 specimens was not change appearance color after corrosion The weight change was low in uenced where weight gain was 0.8 mg/ cm 2 . Several types of research 16,49,50 have previously established the deleterious in uence of NaCl deposits on the oxidation resistance of (CP) titanium and titanium alloys. An active corrosion process is considered responsible for reducing corrosion protection in the presence of NaCl deposits.…”

Section: Nacl Hot Corrosionmentioning

confidence: 99%

Effect of oxide layers formed by thermal oxidation on mechanical properties and NaCl-induced hot corrosion behavior of TC21 Ti-alloy

Ahmed

El-Zomor

Ghazala

et al. 2022

Preprint

View full text Add to dashboard Cite

In the current study on TC21 Ti-alloy (6.5Al-3Mo-1.9Nb-2.2Sn-2.2Zr-1.5Cr), the thermal oxidation formed oxide layers that considerably influenced mechanical properties (hardness and wear). The corrosion of raw and oxidized specimen by NaCl-induced hot salt was also examined. TC21 alloy specimens were oxidized at 600, 700, 800, and 900°C for 5, 20, and 50 h. Salt spray test was utilized on raw and oxidized (600°C /50 h & 800°C/50 h) specimens of salt corrosion evaluated at 600°C for cycling 5, 10, 20, 30, 40, and 50 h. Average thickness of the layer grew with increasing oxidation time and temperature. Thin oxide layer (average 0.16 µm) was generated by oxidation temperature at 600°C duration 5 h. at 800°C oxide layer thickness was 10.8 µm large layer. Most significant surface hardness was 1108 HV0.5 which is produced for an oxidized layer at 900°C. However, lowest hardness of 360 HV0.5 was recorded for raw materials. The best wear resistance had at 800°C specimens, while raw ones had the lowest. During NaCl hot corrosion test, weight loss of the raw specimen was 6.4 mg/cm2 because the corrosion product was flaking off. However, for oxidized at 600°C for 50 h, weight loss after corrosion testing was 0.54 mg/cm2, which was less than that of specimen before corrosion. Oxidized specimens at 800 exhibited the best mechanical characteristics and corrosion resistance.

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Degradation mechanism of Ti-6Al-2Sn-4Zr-2Mo-Si alloy exposed to solid NaCl deposit at high temperature

Cited by 30 publications

References 44 publications

Effect of oxide layers formed by thermal oxidation on mechanical properties and NaCl-induced hot corrosion behavior of TC21 Ti-alloy

Effect of oxide layers formed by thermal oxidation on mechanical properties and NaCl-induced hot corrosion behavior of TC21 Ti-alloy

AgCl-induced hot salt stress corrosion cracking in a titanium alloy

Effect of oxide layers formed by thermal oxidation on mechanical properties and NaCl-induced hot corrosion behavior of TC21 Ti-alloy

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