Growth Mechanism of Aluminide Coating on T92 Steel Prepared by Slurry Aluminizing at 700 ℃

doi:10.11902/1005.4537.2022.141

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (3): 587-593 DOI: 10.11902/1005.4537.2022.141

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Growth Mechanism of Aluminide Coating on T92 Steel Prepared by Slurry Aluminizing at 700 ℃

GONG Bingbing¹, LIU Guangming¹(

), AN Chunxiang², MEI Linbo², ZHANG Bangyan¹

^1.School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China
^2.Shanghai Electric Power Plant Equipment Co. Ltd., Steam Turbine Plant, Shanghai 201306, China

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Abstract

The aluminizing process of T92 steel was conducted by slurry aluminizing method. The growth kinetics of the aluminized layer with a slurry layer thickness of about 80 μm at 700 ℃ was tested. The surface and cross-sectional morphology and composition of the aluminide coating were characterized by using SEM, EDS and XRD respectively. The results show that the active Al atoms ([Al]) diffused inward to form Fe₂Al₅ (η) phase in the first three hours of aluminizing. Then [Al] began to accumulate at the interface of the slurry/the formed aluminide coating, while Fe diffused outward rapidly resulted in the formation of the outer portion of the coating composed of mixed-phases Fe₂Al₅ (η) and FeAl₃ (θ). After 10 h, the inner portion of FeAl (B2) phase could be clearly observed in the aluminized coatings. The mechanism of aluminized coating growth process and the relevant diffusion process of metallic components was discussed from the point of view of kinetics and thermodynamics. The thickness of the η-phase layer formed by the diffusion of [Al] with time can be expressed by equation of x=18.40t^1/2-4.80.

Key words: T92 steel slurry aluminizing kinetics thermodynamics

Received: 15 June 2022 32134.14.1005.4537.2022.141

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(51961028)

Corresponding Authors: LIU Guangming, E-mail: gemliu@126.com

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Cite this article:

GONG Bingbing, LIU Guangming, AN Chunxiang, MEI Linbo, ZHANG Bangyan. Growth Mechanism of Aluminide Coating on T92 Steel Prepared by Slurry Aluminizing at 700 ℃. Journal of Chinese Society for Corrosion and protection, 2023, 43(3): 587-593.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2022.141 OR https://www.jcscp.org/EN/Y2023/V43/I3/587

Fig.1 XRD patterns of T92 steel after aluminizing at 700 ℃ for 1 and 4 h

Fig.2 Cross-sectional morphologies of T92 steel after aluminizing at 700 ℃ for 0.5 h (a), 1 h (b), 2 h (c), 3 h (d), 4 h (e) and 10 h (f), and EDS analysis results for 1 h (g) and 4 h (h) aluminized samples

Table 1 Concentrations of main elements in the marked areas in Fig.2 (atomic fraction / %)

Fig.3 Thickness (x) of η phase layer as a function of time

Fig.4 Thickness (x) of η phase layer in the aluminized coating as a function of square root of time

Substance	$Δ H 2980$ / (J·mol^-1)	$Δ S 2980$ / (J·K^-1 mol^-1)
Fe	0	27.15
Al	0	28.33
B2	-48483.14	50.74
η	-201636.29	153.61
θ	-111368.88	95.29

Table 2 Thermodynamic data of all phases in the aluminized coating^[21]

Table 3 Relationships between molar phase transition enthalpy and temperature for the reactions of Fe and Al

Table 4 Relationships between molar entropy change and temperature for the reactions of Fe and Al

Table 5 Relationships between molar Gibbs free energy change and temperature for the reactions of Fe and Al

Fig.5 Δ_rH_phase-T (a) and Δ_rG_phase-T (b) curves for the different reactions of Fe and Al

Fig.6 Growth model of aluminizing coating on T92 steel: (a) V_D>V_P, (b) V_D=V_P, (c) V_D<V_P

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