Comparison of Na2SO4, K2SO4 and Na2SO4-K2SO4 deposit induced hot corrosion of a β-NiAl coating

Wang, Yaping; Pillai, Rishi; Yazhenskikh, Elena; Frommherz, Martin; Müller, Michael; Quadakkers, Willem J.; Naumenko, D.

doi:10.1016/j.corsci.2022.110146

Cited by 14 publications

(2 citation statements)

References 33 publications

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“…All visible precipitations showed enrichments of aluminium, titanium, and molybdenum (see Figure 9). Wang et al [ 47 ] also find minor levels of attack for a NiAl coating at 600°C with alkali sulfates, which is consistent with this study.

3\text{N}{\text{a}}_{2}\text{S}{{\rm{O}}}_{4}+2\text{Al\unicode{x02007}}+1.5{{\rm{O}}}_{2}\to 3\text{N}{\text{a}}_{2}{\rm{O}}+\text{A}{\text{l}}_{2}{(\text{S}{{\rm{O}}}_{4})}_{3}\text{\unicode{x02007}}({\rm{\Delta }}{{\text{G}}}_{600\text{\unicode{x000b0}C}}=-221.4\unicode{x02007}\unicode{x0200A}\text{kJmo}{\text{l}}^{ \mbox{-} 1}).

…”

Section: Resultssupporting

confidence: 92%

Long‐term low‐temperature hot corrosion of PTA welded René 41 superalloy under marine‐like conditions

Hempel

Mandel

Schimpf

et al. 2022

Materials & Corrosion

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The hot corrosion behavior of plasma transferred arc (PTA) welded René 41 in NaCl, NaVO3, Na2SO4, and a salt mixture of 87.5 wt% Na2SO4 + 5 wt% NaCl + 7.5 wt% NaVO3 was investigated at 600°C. The single‐salt experiments were carried out to identify specific corrosion characteristics and to provide insights into and, thus, an understanding of the corresponding corrosion processes. NaVO3 and NaCl showed strong corrosive effects, while Na2SO4 proved less corrosive. Long‐term experiments were carried out to simulate real machine operating conditions. After cyclic studies with repeated changes in temperature, the deep and local corrosive attack became apparent, which is characteristic for low‐temperature hot corrosion.

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3\text{N}{\text{a}}_{2}\text{S}{{\rm{O}}}_{4}+2\text{Al\unicode{x02007}}+1.5{{\rm{O}}}_{2}\to 3\text{N}{\text{a}}_{2}{\rm{O}}+\text{A}{\text{l}}_{2}{(\text{S}{{\rm{O}}}_{4})}_{3}\text{\unicode{x02007}}({\rm{\Delta }}{{\text{G}}}_{600\text{\unicode{x000b0}C}}=-221.4\unicode{x02007}\unicode{x0200A}\text{kJmo}{\text{l}}^{ \mbox{-} 1}).

…”

Section: Resultssupporting

confidence: 92%

Long‐term low‐temperature hot corrosion of PTA welded René 41 superalloy under marine‐like conditions

Hempel

Mandel

Schimpf

et al. 2022

Materials & Corrosion

View full text Add to dashboard Cite

show abstract

“…Meanwhile, aluminide diffusion coatings that can provide an alumina protective layer have been introduced and are believed to improve type II hot corrosion resistance. [26][27][28] Dense alumina is widely known for effectively protecting the inward diffusion of aggressive elements, preventing the substrate from the detrimental effect of hot corrosion. [29][30][31][32] Despite the fact that other coating elements like Cr and Co may contribute signicantly to the improvement of hot corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%