Evaluation of the hot corrosion protection of coatings for turbine hot section components

Roode, Mark van; Hsu, L.L.

doi:10.1016/0257-8972(89)90084-4

Cited by 11 publications

(2 citation statements)

References 11 publications

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“…On the other hand, the harsh operating conditions (increase in turbine inlet temperature) experienced by aero-gas turbines has led to the development of a variety of coating systems [6][7][8][9] to protect the turbine components from corrosive attack due to the combined effects of atmospheric contaminants, fuel-born impurities and high-temperature oxidation [10][11][12][13]. In this sense, as the Al content of these superalloys is too low to ensure the formation of an external, continuous, thermodynamically stable and adherent alumina scale, it is necessary to circumscribe the life service effects by enriching the surface with an Al ''reservoir'' [2,[14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Cyclic and Isothermal Oxidation at 1,100 °C of a CVD Aluminised Directionally Solidified Ni Superalloy

2008

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CVD aluminide coatings deposited on a Directionally Solidified (DS) substrate were oxidized at 1,100°C up to 240 h under isothermal and cyclic oxidation conditions to study the growth mechanisms of the oxide scales and the possible degradation of the coatings. The specimens were investigated using light and scanning electron (SEM) microscopy, energy-dispersive spectrometry (EDS) and X-Ray Diffraction (XRD). The results indicate that the coatings provide a much greater beneficial effect under isothermal conditions than upon cycling. The cycled specimens undergo oxide-scale spallation and increased roughening, which can derive from growth and thermal stresses as well as from the NiAl ? Ni 3 Al phase transformation associated with Al depletion. Under isothermal conditions, typical oxide scales formed with the appearance of some rumples. However, the origin of rumpling is uncertain from these experimental results.

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Section: Introductionmentioning

confidence: 99%

Cyclic and Isothermal Oxidation at 1,100 °C of a CVD Aluminised Directionally Solidified Ni Superalloy

2008

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“…Hot corrosion of b-NiAl compound either as a bulk material or as the main constituent of protective aluminide coatings has been studied extensively [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Crevice Formation on the Surface of the Simple and Ti-Modified Aluminide Coatings Under a Fused Na2SO4 Salt Film

2011

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The hot-corrosion behavior of simple and Ti-modified aluminide coatings on nickel-based superalloy B-1900 was investigated. The sodium sulfate salt deposition rate was 1 mg/cm 2 for each 32 h at 900°C. Although the mass change data showed relatively more durability for the modified coatings, morphological characterization of the specimens and corrosion products revealed similar degradation mechanisms for all coatings studied. The base of a that pit developed during hot corrosion initiation had a low oxygen pressure and the pits grew perpendicular to the surface to create deep crevices. The growth and joining of these crevices caused large pieces of the coating to be lost, exposing the bare substrate to the fused salt at longer times. The initiation and advancement of the crevices are discussed and a mechanism is proposed to explain this type of hot corrosion morphology.

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Platinum and the hot corrosion behaviour of a nickel based superalloy

Tatlock

Hurd²

1990

Materials & Corrosion

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The hot corrosion behaviour of a platinum containing nickel based superalloy (RJM 2012) is compared with that of a similar alloy (IN 792 + Hf) without platinum. The results of burner rig testing at 800°C showed that the oxide scales on the platinum containing alloy were still very protective after 1000 h on test whilst the alloy without platinum was severely attacked after only 200 h. The influence of platinum on the degradation mechanisms is discussed.

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Evaluation of the hot corrosion protection of coatings for turbine hot section components

Cited by 11 publications

References 11 publications

Cyclic and Isothermal Oxidation at 1,100 °C of a CVD Aluminised Directionally Solidified Ni Superalloy

Cyclic and Isothermal Oxidation at 1,100 °C of a CVD Aluminised Directionally Solidified Ni Superalloy

Crevice Formation on the Surface of the Simple and Ti-Modified Aluminide Coatings Under a Fused Na2SO4 Salt Film

Platinum and the hot corrosion behaviour of a nickel based superalloy

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