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@ARTICLE{Wang:875316,
      author       = {Wang, Yaping and Pillai, Rishi and Yazhenskikh, Elena and
                      Frommherz, Martin and Müller, Michael and Naumenko, Dmitry},
      title        = {{R}ole of {T}emperature in {N}a 2 {SO} 4 –{K} 2 {SO} 4
                      {D}eposit {I}nduced {T}ype {II} {H}ot {C}orrosion of
                      {N}i{A}l {C}oating on a {C}ommercial {N}i‐{B}ased
                      {S}uperalloy},
      journal      = {Advanced engineering materials},
      volume       = {22},
      number       = {6},
      issn         = {1527-2648},
      address      = {Frankfurt, M.},
      publisher    = {Deutsche Gesellschaft für Materialkunde},
      reportid     = {FZJ-2020-01947},
      pages        = {1901244},
      year         = {2020},
      abstract     = {The life span of gas turbine coatings may be restricted by
                      type II hot corrosion when exposed at elevated temperatures
                      in aggressive environments during service. Herein, the
                      temperature dependence of corrosion morphologies and
                      kinetics of NiAl coating on a second‐generation single
                      crystalline Ni‐based superalloy is studied to provide an
                      insight into the possible corrosion mechanisms. A series of
                      tests are performed at 600–800 °C in air‐300 ppm
                      SO2 atmosphere with $Na2SO4–20\%$ K2SO4 salt mixture as
                      deposit. Severe attack is observed at both 700 and 750 °C
                      after 24 h exposure, whereas at 600 and 800 °C, only a
                      minor attack is found. The results indicate that the
                      corrosion rate is strongly governed by Na2SO4–NiSO4 liquid
                      formation, and temperature affects the attack rate of the
                      outer coating (mainly β‐NiAl phase) primarily by changing
                      the required minimum SO3 partial pressure to stabilize this
                      liquid. The influence of temperature and 𝑝SO3 on phase
                      equilibrium of the salt and oxide mixture is calculated with
                      an in‐house developed thermodynamic database. The
                      predicted minimum 𝑝SO3 for liquid formation calculated
                      with the database is consistent with the experimental
                      results.},
      cin          = {IEK-2},
      ddc          = {660},
      cid          = {I:(DE-Juel1)IEK-2-20101013},
      pnm          = {113 - Methods and Concepts for Material Development
                      (POF3-113)},
      pid          = {G:(DE-HGF)POF3-113},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000514743600001},
      doi          = {10.1002/adem.201901244},
      url          = {https://juser.fz-juelich.de/record/875316},
}