Effect of MgSO4 addition on alkali sulphates induced hot corrosion of a β-NiAl coating

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science Pub Date : 2025-03-17 DOI:10.1016/j.corsci.2025.112869

Yaping Wang , Egbert Wessel , Daniel Grüner , Rishi Pillai , Elena Yazhenskikh , Martin Frommherz , Michael Müller , Willem Joseph Quadakkers , Dmitry Naumenko

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引用次数: 0

Abstract

The effect of MgSO₄ addition on alkali sulphates induced hot corrosion of a β-NiAl coating was studied by performing a series of tests with deposits of Na₂SO₄, Na₂SO₄-20 %K₂SO₄ and Na₂SO₄-12 %K₂SO₄-35 %MgSO₄ (mol.% for all) at 700 °C in air with addition of SO₂. For elucidating the observed corrosion phenomena, various salt-oxide/NiAl powder mixtures were exposed to the same hot corrosion test conditions. Two pseudo-binary phase diagrams of the Na, K, Mg-sulphate systems were calculated using an in-house developed thermodynamic database. Addition of MgSO₄ to Na₂SO₄-20 %K₂SO₄ deposit salt inhibited the hot corrosion attack during 24 h exposure, which is related to consumption of aggressive K₂SO₄ by the formation of solid K₂Mg₂(SO₄)₃. However, extending the exposure with Na₂SO₄-12 %K₂SO₄-35 %MgSO₄ deposit to 100 h resulted in severe corrosion attack. The latter observation is explained by a reaction between K₂Mg₂(SO₄)₃ and NiAl causing formation of a Mg, Ni and Al containing spinel accompanied by release of the aggressive K₂SO₄ into the liquid phase.

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来源期刊

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.