The effect of pre-oxidation on the hot corrosion behavior of CoNiCrAlHf alloy in Na2SO4 environment at elevated temperature

Ali, Rawaid; Song, Peng; Khan, Muhammad Saleem; Huang, Taihong; Ali, Sajid; Sha, Syed Hatim; Lu, Jiansheng; Wahab, Zain Ul; Pervaiz, Seemab

doi:10.1007/s00339-022-05897-z

Cited by 6 publications

(3 citation statements)

References 51 publications

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“…Cr 2 O 3 prevents oxidizing species from corroding substrate alloys [42]. It is also reported by Chatha et al [31]; Yin et al [48]; Song et al [24]; Alia et al [33]; Bai et al [35]; that Cr 2 O 3 obstructs the corrosion of substrate alloys by preventing the dissemination of oxidizing species. The presence of NiCr 2 O 4 spinels in the surface oxide scale also helps increase corrosion endurance, since these phases have lower anion and cation diffusion coefficients than their parent oxides [67].…”

Section: Discussionmentioning

confidence: 71%

“…624°C for Na 3 Fe(SO 4 ) 3 ; 618°C for K 3 Fe(SO 4 ) 3 and 552°C for the blended compound of (Na, K) 3 Fe(SO 4 ) 3 . These melted compounds tend to cause instability [24][25][26]. in the scale by reacting with steel to produce internal sulfides as per the following reaction:…”

Section: Discussionmentioning

confidence: 99%

“…624°C for Na 3 Fe(SO 4 ) 3 ; 618°C for K 3 Fe(SO 4 ) 3 and 552°C for the blended compound of (Na, K) 3 Fe(SO 4 ) 3 . These melted compounds tend to cause instability [24–26]. in the scale by reacting with steel to produce internal sulfides as per the following reaction: Therefore, it is concluded from the above reactions that these alkaline iron-tri-sulfates might be liable for the deprivation of superheater tubes in coal-fired steam generator plants [27].…”

Section: Discussionmentioning

confidence: 99%

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Effect of burnishing on HVOF coated boiler steel against hot corrosion in actual boiler environment

Agnihotri,

Kalsi,

Kansal

2023

Surface Engineering

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Hot corrosion of boiler tubes used in steam-generating systems has been recognized as a severe problem, resulting in tube wall thinning and premature failure. In this study, the effect of burnishing the thermal sprayed coatings against high-temperature corrosion of SA213-T22 boiler steel in actual environmental conditions of coal-fired boiler has been investigated. An experimental study was carried out for ten cycles, where the individual cycle consists of one-hundred hours of exposure trailed by one hour of ambient cooling. The hot corroded specimens are visually inspected at the end of each cycle to check for any variation in colour, luster, spalling tendency, and other physical changes in scale. The tested specimens were characterized through Thermogravimetric Technique, Microhardness Tester, Optical Microscope, Scanning Electron Microscope, and X-Ray Diffractometer to study their hot corrosion performance. The findings of this work suggest that burnishing can be potentially used for providing superior hot corrosion protection to any of the thermal sprayed coated specimens.

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