Hot corrosion behavior of boiler tube materials in refuse incineration environment

Yamada, Katsuhiro; Tomono, Yutaka; Morimoto, Junji; Sasaki, Yoh; Ohmori, Akira

doi:10.1016/s0042-207x(01)00468-7

Cited by 77 publications

(35 citation statements)

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“…Yamada et al 14) carried out studies to evaluate the hightemperature corrosion resistance of Ni-20Cr, Ni-50Cr and Cr coated boiler tubes in actual refuse incineration plant as well as in laboratory tests. Uusitalo et al 15) and Uusitalo et al 16) have reported the use of thermal sprayed Ni/Cr coatings on ferritic and austenitic boiler steels and studied the high temperature corrosion of the coatings in various envi-ronments consisting of different compositions of Na 2 SO 4 , K 2 SO 4 , NaCl, KCl salts in oxidising as well as reducing atmospheres of mixed gases.…”

Section: Introductionmentioning

confidence: 99%

Hot Corrosion Behaviour of Plasma Sprayed Coatings on a Ni-based Superalloy in Na2SO4-60%V2O5 Environment

2005

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NiCrAlY, Ni 3 Al and Stellite-6 metallic coatings were deposited on a Ni-based . NiCrAlY was used as bond coat in all the cases. Hot corrosion studies were conducted on uncoated as well as plasma spray coated superalloy specimens after exposure to molten salt at 900°C under cyclic conditions. The thermogravimetric technique was used to establish kinetics of corrosion. X-Ray Diffraction, SEM/EDAX and EPMA techniques were used to analyse the corrosion products. The uncoated superalloy suffered a catastrophic corrosion in the form of intense spalling of the scale accompanied by disintegration of the scale with cracking sounds. NiCrAlY coated specimen showed a minimum weight gain, whereas the Stellite-6 indicated a maximum weight gain among the coatings studied. All the coatings were found to be successful in reducing spalling of the superalloy substrate. It is concluded that the formation of oxides and spinels containing nickel, aluminium, chromium or cobalt contributes to an improved hot corrosion resistance.KEY WORDS: hot corrosion; plasma spray coatings; superalloy; NiCrAlY; and protective coatings.ronments consisting of different compositions of Na 2 SO 4 , K 2 SO 4 , NaCl, KCl salts in oxidising as well as reducing atmospheres of mixed gases. Singh and Prakash 17) studied the corrosion behaviour of plasma-sprayed Ni 3 Al coatings on boiler steels in oxidation and molten salt environments at 900°C and found these coating quite effective in developing hot corrosion resistance.The MCrAlY bond coats provide a rough surface for mechanical bonding of the ceramic top coat, protect the underlying alloy substrate against high temperature oxidation corrosion and minimize the effect of thermal expansion mismatch between the substrate and the ceramic top coat materials. 18)Although considerable insight has been accumulated on oxidation behaviour of NiCrAlY and Ni-20Cr coatings and to some extent of Ni 3 Al coatings on Ni-base superalloys in air as well as in aggressive environments at high temperatures, but no information is available on the high temperature oxidation behaviour of these coatings in an aggressive environment of molten salt (Na 2 SO 4 -60 %V 2 O 5 ), which has much lower melting point (Ϸ500°C) than other compositions of Na 2 SO 4 -V 2 O 5 mixtures as per the open literature. 19)Similarly the investigation will provide vital information on the hot corrosion behaviour of plasma spray Stellite-6 coatings, which will be useful for studying its use in combined corrosion and wear situations. Uusitalo et al. 15) have also realized that there is a little discussion of high temperature corrosion testing on thermal sprayed coatings in literature. Moreover, due to the intrinsic properties of thermal spraying technique, it must be emphasized that more work is needed in order to get a reliable corrosion resistant coating in many environments. 20)The objective of the work is to characterise the high temperature corrosion mechanisms for plasma spray metallic coatings of NiCrAlY, Ni-20Cr, Ni 3 Al and Stellite-6 on a ...

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Section: Introductionmentioning

confidence: 99%

Hot Corrosion Behaviour of Plasma Sprayed Coatings on a Ni-based Superalloy in Na2SO4-60%V2O5 Environment

2005

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“…Goyal et al [121] confirm that the addition of inhibitor such as ZrO 2 to boiler environment such as Na 2 SO 4 -60% V 2 O 5 can help in decreasing the corrosion rate of superalloys at high temperature. Yamada et al [106] tested the D-gun, HVOF, and plasma sprayed 50% Ni-50% Cr alloy coating on steel and Ni based superalloys in actual refuse incineration environment. Analysis revealed the presence of chlorine, which is the main cause of hot corrosion in the coated areas.…”

Section: Remedial Measuresmentioning

confidence: 99%

Corrosion Problems in Incinerators and Biomass-Fuel-Fired Boilers

Mudgal

Singh

Prakash

2014

International Journal of Corrosion

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Incinerators are widely used to burn the municipal waste, biowaste, wood, straw, and biomedical waste. Combustion of these types of waste results in generation of chlorides of sodium and potassium which may attack the metallic part of the incinerator. In biofuel-fired boilers, similar type of highly corrosive environment is present. Attempt has been made to review the corrosion problems and their solutions as per the available literature.

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“…Yamada et al [63] carried out studies to evaluate the hightemperature corrosion resistance of Ni-20Cr, Ni-50Cr and Cr coated boiler tubes in an actual refuse incineration plant as well as in laboratory tests. It was observed that a detonation sprayed Ni-50Cr coating exhibited the highest corrosion resistance in the laboratory test at 873 K among the detonation gun sprayed, plasma sprayed and HVOF sprayed coatings.…”

Section: Nickel-chromium Coatingsmentioning

confidence: 99%

Use of plasma spray technology for deposition of high temperature oxidation/corrosion resistant coatings – a review

Singh¹,

Sidhu

Puri

et al. 2007

Materials & Corrosion

109

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High temperature oxidation is one of the main failure modes of the hot-section components in gas turbines, boilers, waste incinerations, diesel engines, coal gasification plants, chemical plants and other energy generation systems. In such applications the use of Fe-, Ni-and Co-based alloys, especially of superalloys is well known. The superior mechanical strength and good corrosion resistance of the superalloys at high temperature make them favorites for such applications. However, the presence of combustion gases constitutes an extreme environment and hot corrosion is inevitable when superalloys are used at high temperatures for long durations of time. Therefore these alloys need to be protected against this type of oxidation. Several countermeasures have been suggested in the literature to combat the same. One such countermeasure against hot corrosion and oxidation constitutes the deposition of protective coatings on these alloys. Among the various techniques used for deposition of coatings, plasma spraying is a versatile technology that has been successful as a reliable cost-effective solution for many industrial problems. It allows the spraying of a wide range of high performance materials from superalloys and refractory intermetallic compounds to ceramics with continuously increasing commercial applications. Furthermore it does not cause deterioration of the substrate alloys, and relatively thick coatings can be formed with high deposition rates. In this paper the technique of plasma spraying has been detailed and the role of plasma sprayed coatings to arrest high temperature oxidation has been discussed with the help of a comprehensive literature survey. The main focus of this investigation is the studies related to plasma sprayed NiCrAlY, Ni-Cr, Nickel aluminide and Co-based coatings.

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Hot corrosion behavior of boiler tube materials in refuse incineration environment

Cited by 77 publications

References 0 publications

Hot Corrosion Behaviour of Plasma Sprayed Coatings on a Ni-based Superalloy in Na2SO4-60%V2O5 Environment

Hot Corrosion Behaviour of Plasma Sprayed Coatings on a Ni-based Superalloy in Na2SO4-60%V2O5 Environment

Corrosion Problems in Incinerators and Biomass-Fuel-Fired Boilers

Use of plasma spray technology for deposition of high temperature oxidation/corrosion resistant coatings – a review

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