T92钢700 ℃下料浆渗铝机理研究

doi:10.11902/1005.4537.2022.141

中国腐蚀与防护学报

2023, Vol. 43

Issue (3): 587-593 CSTR: 32134.14.1005.4537.2022.141 DOI: 10.11902/1005.4537.2022.141

研究报告

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T92钢700 ℃下料浆渗铝机理研究

龚兵兵¹, 刘光明¹(

), 安春香², 梅林波², 张帮彦¹

^1.南昌航空大学材料科学与工程学院南昌 330063
^2.上海电气电站设备有限公司汽轮机厂上海 201306

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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摘要:

采用料浆渗铝法在T92钢上开展了渗铝工艺研究，测试了700 ℃料浆层厚度约80 μm渗铝层生长动力学，采用XRD、SEM及EDS对渗铝层表面物相结构和渗铝层截面形貌、厚度和成分进行研究。结果表明：渗铝的前3 h活性Al原子 ([Al]) 向内扩散形成Fe₂Al₅ (η) 相；随后[Al]开始在料浆层与渗铝层界面堆积，此时，Fe以较快的速度向外扩散并形成Fe₂Al₅ (η) 和FeAl₃ (θ) 混合相外层；10 h后在渗铝层内部可以清晰观察到FeAl (B2) 相层。从动力学和热力学角度探讨了渗铝层扩散及生长过程机理。[Al]向内扩散形成的η相层厚度随时间变化可用x=18.40t^1/2-4.80表达。

关键词 ： T92钢, 料浆渗铝, 动力学, 热力学

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

收稿日期: 2022-06-15 32134.14.1005.4537.2022.141

ZTFLH:

TG174

基金资助:国家自然科学基金(51961028)

通讯作者: 刘光明，E-mail：gemliu@126.com，研究方向为材料腐蚀与防护

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

作者简介: 龚兵兵，男，1996年生，硕士生

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引用本文:

龚兵兵, 刘光明, 安春香, 梅林波, 张帮彦. T92钢700 ℃下料浆渗铝机理研究[J]. 中国腐蚀与防护学报, 2023, 43(3): 587-593.
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.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2022.141 或 https://www.jcscp.org/CN/Y2023/V43/I3/587

图1 T92钢样品在700 ℃下1和4 h渗铝后的XRD谱

图2 T92钢在700 ℃下不同时间渗铝后的截面形貌及相应元素分布

表1 图2中标记区域的元素成分分析结果

图3 η相层厚度 (x) 随时间变化曲线

图4 渗铝层中η相层厚度 (x) 随时间的平方根变化曲线

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

表2 渗铝层中各相的热力学数据[21]

表3 Fe和Al反应摩尔相变焓与温度的关系式

表4 Fe和Al反应的摩尔熵变与温度的关系式

表5 Fe和Al反应的摩尔Gibbs自由能变化与温度的关系式

图5 不同Fe-Al化合反应的ΔrH相-T

图6 T92钢渗铝层的生长模型

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