Preparation and Hot Corrosion Behavior of a NiCrAlY?+?AlNiY Composite Coating

doi:10.1016/j.jmst.2016.04.017

Abstract

Abstract: In this study, a NiCrAlY?+?AlNiY composite coating was prepared by arc ion plating technique and subsequent annealing treatment. Cyclic hot corrosion tests of the composite coating and a reference NiCrAlY coating coated with mixed salts of Na₂SO₄?+?K₂SO₄ and Na₂SO₄?+?NaCl were carried out at 700?°C. The results indicated that the composite coating performed better against the corrosion due to the gradient element distribution in Al-enriched outer layer and Cr-enriched inner layer. The corrosion mechanisms for the two coatings were also discussed.

Key words: Composite coating, Arc ion plating, Hot corrosion

Xin Peng, Sumeng Jiang, Jun Gong, Xudong Sun, Cao Sun. Preparation and Hot Corrosion Behavior of a NiCrAlY?+?AlNiY Composite Coating[J]. J. Mater. Sci. Technol., 2016, 32(6): 587-592.

Figures/Tables 8

XRD patterns of the NiCrAlY coating and composite coating (as-deposited (a) and as-annealed (b)).

Cross-sectional BSE images of the NiCrAlY coating (a, c) and composite coating (b, d) (as-deposited (a, b) and as-annealed (c, d)).

Element distribution profiles in the cross-section of the NiCrAlY coating (a) and the composite coating (b).

Corrosion kinetic curves of the coatings in 75?wt% Na2SO4?+?25?wt% K2SO4 (a) and 75?wt% Na2SO4?+?25?wt% NaCl (b) at 700?°

XRD patterns of the coatings after corrosion with 75?wt% Na2SO4?+?25?wt% K2SO4 at 700?°

C (corrosion for 240?h (a) and 500?h (b)).

Cross-sectional BSE images of the NiCrAlY coating (a, c) and the composite coating (b, d) after corrosion in 75?wt% Na2SO4?+?25?wt% K2SO4 at 700?°

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