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 Joseph; Naumenko, Dmitry

doi:10.1016/j.corsci.2022.110146

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

Journal Article · 02 February 2022 · Corrosion Science

DOI: https://doi.org/10.1016/j.corsci.2022.110146 · OSTI ID:1883749

Wang, Yaping ^[1];

^[2]; Yazhenskikh, Elena ^[1]; Frommherz, Martin ^[3]; Müller, Michael ^[1]; Quadakkers, Willem Joseph ^[1]; Naumenko, Dmitry ^[1]

Institute of Energy and Climate Research, Juelich (Germany)
Institute of Energy and Climate Research, Juelich (Germany); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
MTU Aero Engines AG, Munich (Germany)

Here, hot corrosion behaviour of a β-NiAl coating induced by Na₂SO₄, K₂SO₄, and Na₂SO₄-K₂SO₄ deposits was investigated at 700 °C in air + 300 ppm SO₂. To provide an insight into the corrosion mechanisms, phase equilibria of the Na₂SO₄-K₂SO₄-NiO-SO₃ system were calculated using an in-house developed thermodynamic database. The attack rates and morphologies could be correlated with the deposit compositions and their reactions with oxides. K₂SO₄ and Na₂SO₄-K₂SO₄ deposits are more corrosive than Na₂SO₄. This is attributed to a reduction of the melting temperature of the deposit and the formation of Ni-containing mixed sulphate phases in the presence of K₂SO₄.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC); China Scholarship Council; Federal Ministry of Economic Affairs and Energy; MTU Aero Engines AG

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1883749

Journal Information:: Corrosion Science, Journal Name: Corrosion Science Journal Issue: NA Vol. 198; ISSN 0010-938X

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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