NaCl induced corrosion of Ti-6Al-4V alloy at high temperature

Ciszak, Clément; Popa, Iolanda Valentina; Brossard, Jean-Michel; Monceau, Daniel; Chevalier, Sébastien

doi:10.1016/j.corsci.2016.04.016

Cited by 121 publications

(71 citation statements)

References 39 publications

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“…The results obtained in this study are in complete agreement with a previous study evaluating the behavior of Ti-6Al-4V alloy in identical experimental conditions [17]. The similar composition of the corrosion scales, with a thin Na 4 Ti 5 O 12 layer at the external part and TiO 2 at the inner part, suggests a similar corrosion mechanism for b21S as for Ti-6Al-4V in the presence of NaCl.…”

Section: Discussionsupporting

confidence: 81%

“…In the presence of moisture, the oxidation mechanisms involve the formation of TiO 2 and Na 2 TiO 3 oxides with release of HCl and H 2 gaseous species [14,16]. The synergistic harmful effect of NaCl and H 2 O was only recently explained by Ciszak et al [17].…”

Section: Introductionmentioning

confidence: 99%

“…Some authors propose oxidation mechanisms of Ti alloys in the presence of NaCl solid deposits [14][15][16][17]. These mechanisms are based on thermodynamical calculations, but not proven experimentally.…”

Section: Introductionmentioning

confidence: 99%

“…They are based on reactions involving O 2 from atmosphere and the deposited NaCl, leading to the release of Cl 2 in parallel with the formation of TiO 2 and NaTiO 2 (or Na 2 TiO 3 ) mixed oxides. The reactions are established with solid NaCl [15,16] or with gaseous NaCl [14,17]. In the presence of moisture, the oxidation mechanisms involve the formation of TiO 2 and Na 2 TiO 3 oxides with release of HCl and H 2 gaseous species [14,16].…”

Section: Introductionmentioning

confidence: 99%

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NaCl-Induced High-Temperature Corrosion of β21S Ti Alloy

et al. 2017

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao.univ-toulouse.fr/ Eprints ID : 18114 Abstract Titanium alloys are very interesting for aeronautics applications because of their low density, high mechanical resistance and good resistance to corrosion in aggressive environments. However, recent developments impose the use of these materials at higher temperatures than those initially envisaged (above 400°C), revealing some uncertainties of their behavior. Depending on the operating conditions, the material can be exposed to variable humidity levels and, in some cases, can be in contact with silica or marine salt. This study aims to evaluate the influence of NaCl solid deposit on the behavior of b21S Ti alloy at 560°C under realistic ambient atmospheres. The tests were carried out in laboratory air and in water vapor-enriched air, on uncoated samples and on samples with solid NaCl deposit. The reaction-product evolution (up to 600 h) was characterized by thermogravimetric analysis, SEM observations (surface and cross section), XRD and microhardness profiling on cross sections. An aggravation of the corrosion phenomena in the presence of NaCl solid deposit was observed, that was related to the presence of gaseous metal chlorides, leading to the establishment of an active corrosion process.

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Section: Discussionsupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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NaCl-Induced High-Temperature Corrosion of β21S Ti Alloy

et al. 2017

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“…Qian et al have pointed out that the significant decrease of fatigue properties of structural steel in NaCl environment was ascribed to the hydrogen‐induced corrosion fatigue and also proposed a numerical model of crack initiation. The Ti‐6Al‐4V alloy has been widely used in various industries, due to its excellent mechanical properties and corrosion resistance . Recently, the Ti‐6Al‐4V alloy has been used to fabricate the blades in steam turbine instead of the traditional materials such as 2Cr13.…”

Section: Introductionmentioning

confidence: 99%

Very high‐cycle fatigue behaviour ofTi‐6Al‐4Valloy under corrosive environment

Zhao

Jia

et al. 2017

Fatigue Fract Eng Mat Struct

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Rotary‐bending fatigue tests of Ti‐6Al‐4V alloy at very high‐cycle regime were performed in air and 3.5% NaCl solution, respectively. The S‐N curves exhibited the characteristic of horizontal asymptote (traditional fatigue limit) in laboratory air, while a lower fatigue limit was shown in 3.5% NaCl solution after around 3 × 108 cycles. The decrease of fatigue life was due to the generation of small surface defects in comparison with that in air. These defects were ascribed to the hydrogen‐induced cracking and fatigue loading. The number of fatigue crack initiation sites decreases with increasing cycles. Only one crack origin site, dominated by slip mechanism, exists in each specimen at very high‐cycle regime. The existing experimental S‐N data of Ti‐6Al‐4V alloy from very high‐cycle fatigue tests were also reviewed. It was shown that the fatigue life (R = −1) of Ti‐6Al‐4V alloy was predominantly influenced by the microstructure and not strongly sensitive to the loading mode and frequency (in the range from 52.5 Hz to 20 kHz) under air condition at room temperature.

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New‐Type Oxidation Barrier Coatings for Titanium Alloys

Smokovych

Scheffler

et al. 2020

Adv Eng Mater

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Herein, a new type of oxidation protection coating for Ti alloys is developed based on a perhydridopolysilazane preceramic polymer and particulate AlB 2 , Si, B, and Ti 3 AlC 2 (so-called MAX phase) fillers; MAX phases are used due to their high temperature and corrosion resistance, thermal shock resistance, and self-healing capability. For coating consolidation, the as-coated samples are pyrolyzed in argon or nitrogen and exposed to air at 800 C for up to 100 h. Although coatings containing AlB 2 or elemental Si and B show a small mass gain in the initial state of exposure to air and after no mass gain up to 100 h, MAX phase-loaded samples show a significant mass gain up to 7 h of exposure and a sudden mass decrease, which corresponds to coating layer spallation. The mechanisms leading to oxidation protection in AlB 2-filled systems are explained with an alumina layer formation and a glass formation from the preceramic polymer. In Si-and B-filled systems, a borosilicate glass phase may be able to reduce the oxygen diffusion capability and the MAX phases as fillers need further investigations; they may cause thermally induced mechanical stresses in the protective coatings.

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NaCl induced corrosion of Ti-6Al-4V alloy at high temperature

Cited by 121 publications

References 39 publications

NaCl-Induced High-Temperature Corrosion of β21S Ti Alloy

NaCl-Induced High-Temperature Corrosion of β21S Ti Alloy

Very high‐cycle fatigue behaviour ofTi‐6Al‐4Valloy under corrosive environment

New‐Type Oxidation Barrier Coatings for Titanium Alloys

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