Oxidation Performance and Interdiffusion Behavior of a Pt-Modified Aluminide Coating with Pre-deposition of Ni

doi:10.1007/s40195-019-00918-y

Abstract

Abstract:

To refrain the interdiffusion of elements while holding good oxidation resistance, a (Ni,Pt)Al/Ni composite coating was prepared by sequential treatments of electroplating Ni and Pt and successive gaseous aluminization. In comparison with normal (Ni,Pt)Al coating, high-temperature performance of the composite coating was evaluated in isothermal oxidation test at 1100 °C. Both the two coatings exhibited good resistance against high-temperature oxidation, but the interdiffusion of elements between composite coating and single-crystal (SC) superalloy substrate was greatly relieved, in which the thickness of secondary reaction zone (SRZ) and the amount of precipitated topologically close-packed phase in the SC alloy matrix were significantly decreased. Mechanisms responsible for delaying rate of coating degradation and SRZ growth/propagation are discussed.

Key words: Aluminide coating, Oxidation, Interdiffusion, Microstructure

He Liu, Shuai Li, Cheng-Yang Jiang, Chun-Tang Yu, Ze-Bin Bao, Sheng-Long Zhu, Fu-Hui Wang. Oxidation Performance and Interdiffusion Behavior of a Pt-Modified Aluminide Coating with Pre-deposition of Ni[J]. Acta Metallurgica Sinica (English Letters), 2019, 32(12): 1490-1500.

Figures/Tables 15

Table 1 Parameters for Ni pre-deposition by electroplating technique

Parameter	Value
NiSO₄·6H₂0	150-200 g L^-1
NaCl	8-10 g L^-1
H₂BO₃	20-30 g L^-1
Na₂SO₄	50-80 g L^-1
C₁₂H₂₅NaSO₄	0.1 g L^-1
pH value	5
Temperature	55 °C
Current density	0.5-1 A dm^-2

Fig. 1 XRD patterns of β-(Ni,Pt)Al coating specimens with and without Ni pre-deposition

Fig. 2 Surface and cross-sectional morphologies of as-received (Ni,Pt)Al (a, c) and (Ni,Pt)Al/Ni coatings (b, d)

Table 2 Coating compositions measured at the region 5 μm to the surface of the two coatings in as-received state (at.%)

	Al	Ni	Pt	Cr	Co
(Ni,Pt)Al	41.58	46.24	5.34	2.26	4.58
(Ni,Pt)Al/Ni	42.91	51.56	5.52

Fig. 3 Mass gain (Δw) (a) and square of mass gain (b) of (Ni,Pt)Al and (Ni,Pt)Al/Ni coating specimens during isothermal oxidation test at 1100 °C

Fig. 4 XRD patterns for (Ni,Pt)Al and (Ni,Pt)Al/Ni coatings after isothermal oxidation test at 1100 °C for 1000 h

Fig. 5 Cross-sectional morphologies of (Ni,Pt)Al (a) and (Ni,Pt)Al/Ni (b) coating specimens after isothermal oxidation test at 1100 °C for 1000 h

Table 3 Coating compositions measured at the region 5 μm to the surface of the two coatings after isothermal oxidation at 1100 °C for 1000 h (at.%)

	Al	Ni	Pt	Cr	Co
(Ni,Pt)Al	26.61	60.45	4.99	3.36	4.6
(Ni,Pt)Al/Ni	33.6	54.59	5.41	3.08	3.33

Fig. 6 Interdiffusion zone evolution of normal β-(Ni,Pt)Al coating specimen during isothermal oxidation test at 1100 °C for a 0 h, b 20 h, c 500 h

Fig. 7 Interdiffusion zone evolution of (Ni,Pt)Al/Ni composite coating during isothermal oxidation test at 1100 °C for a 0 h, b 20 h, c 500 h

Fig. 8 Elemental mappings of (Ni,Pt)Al coating specimen after isothermal oxidation at 1100°C for 500 h

Fig. 9 Elemental mappings of (Ni,Pt)Al/Ni coating specimen after isothermal oxidation test at 1100°C for 500 h

Fig. 10 Evolution of SRZ thickness for (Ni,Pt)Al/Ni and (Ni,Pt)Al coating specimens during isothermal oxidation test

Fig. 11 Schematic illustration showing evolution of SRZ developed below normal (Ni,Pt)Al coating

Fig. 12 Schematic illustration showing evolution of SRZ developed below (Ni,Pt)Al/Ni coating

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