Hot Corrosion and Oxidation Behavior of Pt–Aluminide and Pt–Rh–Aluminide Coatings Applied on Nickle-Base and Cobalt-Base Substrates

IF 3.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Metals and Materials International Pub Date : 2024-03-23 DOI:10.1007/s12540-024-01653-5

Atieh Koochaki-Abkenar, Ahmad Malekan, Mansoor Bozorg, Kourosh Nematipour

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Abstract

This case study compared the microstructure, hot corrosion, and isothermal oxidation behavior of two modified diffusion aluminide coatings on two substrates. The first coating was a platinum aluminide (Pt–aluminide) coating on a nickel-base Inconel 738LC alloy, while the second was a platinum–rhodium aluminide (Pt–Rh–aluminide) coating on a cobalt-base FSX-414 alloy. The coatings were created through electroplating with Pt and Rh, followed by diffusion heat treatment and above-pack aluminizing. Using scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD), the substrate microstructure, coating morphology, and chemical composition were studied. The analysis revealed that both coatings consisted of a dual-phase, with PtAl₂ + β-(Ni-Pt)Al phases on the nickel-base substrate and PtAl₂ + CoAl phases on the cobalt-base substrate. Hot corrosion testing was conducted at 900 °C for 100 h in the presence of 75%Na₂SO₄ + 25%NaCl salts, while oxidation behavior was studied at 1050 °C for 200 h for both coatings. The study results showed that the Pt–Rh–aluminide coating on the cobalt-based substrate had better resistance to hot corrosion, while the Pt–aluminide coating on the nickel-based substrate had better oxidation resistance. The study also discussed the role of Pt, Rh, and substrate composition on the coatings’ hot corrosion and oxidation behavior. The morphology of oxide scales and corroded and oxidized coatings cross-sections were studied using SEM, EDS, and XRD analysis.

Graphical Abstract

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镍基和钴基基底上铂铝化物和铂铑铝化物涂层的热腐蚀和氧化行为

本案例研究比较了两种基材上两种改性扩散铝涂层的微观结构、热腐蚀和等温氧化行为。第一种涂层是镍基 Inconel 738LC 合金上的铂铝化物（Pt-aluminide）涂层，第二种是钴基 FSX-414 合金上的铂铑铝化物（Pt-Rh-aluminide）涂层。这些涂层是通过电镀铂和铑，然后进行扩散热处理和包铝处理而形成的。利用扫描电子显微镜 (SEM)、能量色散光谱 (EDS) 和 X 射线衍射 (XRD) 对基体微观结构、涂层形态和化学成分进行了研究。分析表明，两种涂层都由双相组成，镍基底上有 PtAl2 + β-（Ni-Pt）Al 相，钴基底上有 PtAl2 + CoAl 相。在 75%Na2SO4 + 25%NaCl 盐存在下，在 900 °C 下进行了 100 小时的热腐蚀测试，同时在 1050 °C 下对两种涂层的氧化行为进行了 200 小时的研究。研究结果表明，钴基底上的铂-铑-铝涂层具有更好的抗热腐蚀性，而镍基底上的铂-铝涂层具有更好的抗氧化性。研究还讨论了 Pt、Rh 和基底成分对涂层热腐蚀和氧化行为的作用。使用 SEM、EDS 和 XRD 分析方法研究了氧化鳞片的形态以及腐蚀和氧化涂层的横截面。

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来源期刊

Metals and Materials International 工程技术-材料科学：综合

CiteScore

7.10

自引率

8.60%

发文量

197

审稿时长

3.7 months

期刊介绍： Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.