Investigation on hot corrosion behaviour of Aluminum Rare Earth coating in mixed sulphate at 1050 °C

Wang, Hongyu; Han, Wei; Zhao, Qian; Kan, Peng; Xu, Bin

doi:10.1016/j.corsci.2018.02.041

Cited by 10 publications

(4 citation statements)

References 41 publications

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“…The iron oxide reacts with the base metal with time, due to this the mass of substrate increases with respect to time. The thick iron oxide layer forms on the surface of specimens which is responsible for corrosion [19]. Al 2 O 3 coated specimen showed 25.41% less mass gain as compared to uncoated specimen.…”

Section: Discussionmentioning

confidence: 99%

“…These protective oxides provided the resistance to hot corrosion and reduced the rate of corrosion by 5 times as compared to uncoated specimens. Wang et al [19] examined the thermal barrier coating of aluminum rare earth coating in mixed sulfate on nickel based super alloy GH4033 at 1050°C. Aluminum rare earth coating method was used for coating the substrate.…”

Section: Introductionmentioning

confidence: 99%

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RETRACTED: Comparative study of hot corrosion behavior of thermal sprayed alumina and titanium oxide reinforced alumina coatings on boiler steel

Singh

Kumar

2020

Mater. Res. Express

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The current work evaluates the effect of hot corrosion on ASTM-SA213-T-22 Steel with a coating of 100Al 2 O 3 and 20TiO 2 -Al 2 O 3 at 900°C in the molten salt environment of (Na 2 SO 4 -60% V 2 O 5 ). The coatings were sprayed by plasma spray technique. The bare and coated samples were placed inside the muffle furnace at 900°C for 50 cycles. Each cycle consisted of heating for 1 h and 20 min of cooling at ambient temperature. The kinetics of hot corrosion was analyzed by measuring mass gain after each cycle. The results were achieved by using visual examination, mass change measurement, XRD and SEM/EDS analysis. The result revealed that bare steel was more affected with corrosion and gained more mass due to the development of iron oxide (Fe 2 O 3 ) than the coated sample. Fe 2 O 3 and Cr 2 O 3 were found as major phase in oxide scale of T-22 uncoated steel specimen. The 100Al 2 O 3 and 20TiO 2 -Al 2 O 3 coated specimen indicated the reduction in mass gain by 25.41% and 67.02% respectively as compared to uncoated specimen. Al 2 O 3 coating with the combination of TiO 2 showed better adhesion properties. The presence of TiO 2 enhanced the durability and strength of Al 2 O 3 coating to withstand high temperatures.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

RETRACTED: Comparative study of hot corrosion behavior of thermal sprayed alumina and titanium oxide reinforced alumina coatings on boiler steel

Singh

Kumar

2020

Mater. Res. Express

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“…Although the stable and dense Al 2 O 3 layer may be consumed due to hot corrosion, the dissipation effect is not obvious along with the oxidation in hot corrosion, and the protection of the oxide layer is guaranteed. However, when severe hot corrosion occurs, dispersed Al 2 O 3 will not only have no protective effect, but also accelerate the occurrence of hot corrosion and spallation [ 45 , 46 , 47 ].…”

Section: Discussionmentioning

confidence: 99%

Effects of Different Surface Native Pre-Oxides on the Hot Corrosion Properties of Nickel-Based Single Crystal Superalloys

Chen

et al. 2020

Materials

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A study is carried out on the effect of different surface native pre-oxides on hot corrosion of single crystal nickel-based superalloy at 900 °C. The effect of different oxides formed by different superalloys through pre-oxidation on hot corrosion is verified by normal hot corrosion and tube sealing experiments. The relationship between different surface oxides and the effect of different surface oxides layer on the hot corrosion properties of alloys are studied. In summary, the stable and dense surface pre-Al2O3 layer which can be obtained by pre-oxidation has an obvious positive effect on the improvement of superalloy hot corrosion resistance in reaction. In addition, the internal sulfides are analyzed in depth, and the relationship between Cr, Mo, O and S is discussed in detail.

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“…The oxide solubility of Cr 2 O 3 is much lower as compared to other oxides under basic fluxing condition. Besides, Cr 2 O 3 also showed superior heat stability than other oxides (Wang et al, 2018). Thus, thermodynamically, Cr 2 O 3 supposed to be more stable than other oxides and could be preferable for better hot corrosion resistance.…”

Section: Scale Cross-section Morphology After 150 H Of Hot Corrosionmentioning

confidence: 98%

Optimization of pre-oxidation time for corrosion resistance of cobalt based coating alloy in mixed sulphates

Rehman

Bidabadi

Yang

et al. 2021

ACMM

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Purpose This study aims to optimise the effect of pre-oxidation on hot corrosion behaviour of Tribaloy T-900 at 900 °C in mixed Na2SO4 and K2SO4. Design/methodology/approach Prior to hot corrosion experiment, pre-oxidation treatments were carried in ambient air at 900 °C for 1, 5 and 10 h, respectively. The hot corrosion experiments were performed in a box type furnace at 900 °C. Both surfaces of specimens were brushed with saturated salt solution of 75 wt.% Na2SO4 + 25 wt.% K2SO4. After brushing, the salt-coated specimens were placed in electric stove to ensure drying of salt. After drying, presence of 3 mg/cm2 salt on specimen’s surface was ensured through weighting. Findings The 1-h pre-oxidation treatment prior to hot corrosion showed superior hot corrosion resistance against molten salt attack. An optimum pre-oxidation time of 1 h helped timely formation of protective Cr2O3 layer and inhibited the formation of less stable and porous surface oxides of Ni and Mo during hot corrosion. Originality/value Pre-oxidation effect on hot corrosion behaviour of refractory metal (such as Mo in investigated alloy) containing alloy has never been reported previously. Refractory metals oxide (e.g. MoO3) could transform the corrosion phenomena to catastrophic failure through acidic fluxing.

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Investigation on hot corrosion behaviour of Aluminum Rare Earth coating in mixed sulphate at 1050 °C

Cited by 10 publications

References 41 publications

RETRACTED: Comparative study of hot corrosion behavior of thermal sprayed alumina and titanium oxide reinforced alumina coatings on boiler steel

RETRACTED: Comparative study of hot corrosion behavior of thermal sprayed alumina and titanium oxide reinforced alumina coatings on boiler steel

Effects of Different Surface Native Pre-Oxides on the Hot Corrosion Properties of Nickel-Based Single Crystal Superalloys

Optimization of pre-oxidation time for corrosion resistance of cobalt based coating alloy in mixed sulphates

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Investigation on hot corrosion behaviour of Aluminum Rare Earth coating in mixed sulphate at 1050 °C

Cited by 10 publications

References 41 publications

RETRACTED: Comparative study of hot corrosion behavior of thermal sprayed alumina and titanium oxide reinforced alumina coatings on boiler steel

RETRACTED: Comparative study of hot corrosion behavior of thermal sprayed alumina and titanium oxide reinforced alumina coatings on boiler steel

Effects of Different Surface Native Pre-Oxides on the Hot Corrosion Properties of Nickel-Based Single Crystal Superalloys

Optimization of pre-oxidation time for corrosion resistance of cobalt based coating alloy in mixed sulphates

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Investigation on hot corrosion behaviour of Aluminum Rare Earth coating in mixed sulphate at 1050 °C