Laboratory tests for hot-corrosion studies

Stein, Nicolas; Duret, C.; Morbioli, R.

doi:10.1179/mst.1986.2.3.262

Cited by 22 publications

(3 citation statements)

References 32 publications

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“…The test method selected for the laboratory hot corrosion experimental programme was the 'deposit recoat' method. The latter has proved to be an effective way of simulating 'in-service' deposition conditions during laboratory testing [34]. Every specimen was polluted by spraying a saturated solution in a specific furnace that was heated to 250 8C.…”

Section: Hot Oxidation and Corrosion Testing Methodsmentioning

confidence: 99%

The effect of long term exposure in oxidising and corroding environments on the tensile properties of two gamma-TiAl alloys

et al. 2006

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Section: Hot Oxidation and Corrosion Testing Methodsmentioning

confidence: 99%

The effect of long term exposure in oxidising and corroding environments on the tensile properties of two gamma-TiAl alloys

et al. 2006

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“…When the engine works in the marine environment, a large amount of water vapor and NaCl in the marine atmosphere will enter the engine along with the gas, and be deposited on the blade or coating surface. At the same time, NaCl reacts with sulfur oxide products of fuel combustion to generate Na 2 SO 4 , which is also deposited on the surface of the hot-end components, and these reaction equations are as follows: ( 8)-( 10) [55]. When the engine is running, because the air is compressed step by step, the pressure and temperature will gradually increase, and the temperature in the compressor part can reach 300-750 • C. Although the temperature does not reach the melting point of the deposited salt on the surface, it causes thermal corrosion to the sealing coating of the compressor.…”

Section: Mechanism Of Thermal Corrosion Under the Action Of Molten Saltmentioning

confidence: 99%

Research Status of Aluminum Base Coating on Titanium Alloy

Zeng,

2023

Coatings

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At present, in the aviation industry, titanium alloy is mainly used to manufacture parts such as compressor discs, blades, and the casings of aircraft engines. When titanium alloys are in service, high temperature is generated due to high-speed running friction, which requires them to have high-temperature oxidation resistance and friction resistance. If they are used in an environment with salt corrosion, titanium alloys will face thermal corrosion, which limits their wider practical applications. At present, there are many methods to protect titanium alloys. This paper mainly includes alumina-based coatings and some preparation methods. The characteristics and functional mechanisms of three functional coatings for the service environment, namely highly temperature-resistant alumina-based coating, thermal corrosion-resistant alumina-based coating, and wear-resistant alumina-based coating, are summarized. Finally, the development direction of composite coatings of titanium and titanium alloys for a complex service environment is suggested.

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“…The hot-corrosion tests were carried out at 850ºC using a mixture of 75 wt.% Na 2 SO 4 and 25 wt.% NaCl, which is representative of the composition corrosive atmosphere that high temperature components such as exhaust cones face [6]. The test temperature was set above the melting point of the corrosion medium, which is 640ºC [7]. The corrosion and oxidation resistance of the uncoated and coated samples was evaluated from the mass changes during the corrosion process, and from the chemical and phase composition measured near the sample surface after 336 hours of exposure at 850°C in the corrosive atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Behaviour of Ti-48Al-2Nb-2Cr Alloys

Pelic¹,

Rafaja²,

Masset

et al. 2012

DDF

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γ-TiAl intermetallics are attractive materials for high-temperature structural applications in the aerospace and automobile industries. However, they show environmental embrittlement at elevated temperatures that is mainly related to their low high-temperature corrosion resistance. One way how to improve the high-temperature corrosion resistance is the deposition of protective coatings on the surface of the base material. In this study, samples of a Ti-Al alloy with the chemical composition Ti-48Al-2Cr-2Nb (at.%) were covered by physically vapour deposited (PVD), by metalorganic chemically vapour deposited (MOCVD) and by high-velocity oxy-fuel (HVOF) sprayed coatings. All coatings were based on the Ti-Al alloys and contained different amounts of alloying elements. The corrosion experiments were performed in molten salts containing 75 wt.% Na2SO4and 25 wt.% NaCl at 850°C up to 336 h. Both, PVD and CVD protected coatings reduced the changes in the mass of the samples over the corrosion time. Still, the formation of TiO2could not be avoided, as it was confirmed by glancing-angle X-ray diffraction experiments.

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Laboratory tests for hot-corrosion studies

Cited by 22 publications

References 32 publications

The effect of long term exposure in oxidising and corroding environments on the tensile properties of two gamma-TiAl alloys

The effect of long term exposure in oxidising and corroding environments on the tensile properties of two gamma-TiAl alloys

Research Status of Aluminum Base Coating on Titanium Alloy

Corrosion Behaviour of Ti-48Al-2Nb-2Cr Alloys

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