Effect of stress on hot corrosion behavior of CVD aluminide coatings on Mar-M247 superalloy in the environment of humid air-Na2SO4-NaCl

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology Pub Date : 2025-06-18 DOI:10.1016/j.surfcoat.2025.132413

Qi Hu , Shujiang Geng , Jinlong Wang , Fuhui Wang , Qingyun Sun , Siyao Xia , Yong Wu

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Abstract

Aluminide coatings were deposited on Mar-M247 alloys using the chemical vapor deposition (CVD) process. The effect of stress loading on hot corrosion behavior of Mar-M247 alloy with aluminide coating in the humid air-Na₂SO₄-NaCl environment at 750 °C was investigated. The results revealed that stress induced more defects (e.g., cracks) near the scale/alloy (coating) interface and promoted the inward diffusion of corrosive media (e.g., S), which in turn accelerated the corrosion of both the alloy and coating. The scale thickness and internal corrosion penetration depth also significantly increased compared to the stress-free case. Nevertheless, the aluminide coating still effectively protected the alloy. The detrimental impact of stress on its corrosion resistance was less pronounced than that on the alloy, confirming its potential as a stress-tolerant protective system. This work provides critical insights into designing stress-resistant coatings for gas turbine components operating in aggressive environments.

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应力对湿空气- na2so4 - nacl环境下CVD铝化物涂层Mar-M247高温合金热腐蚀行为的影响

采用化学气相沉积（CVD）技术在Mar-M247合金表面沉积铝化物涂层。研究了应力加载对铝化物涂层Mar-M247合金在750℃潮湿空气- na2so4 - nacl环境中热腐蚀行为的影响。结果表明：应力在合金/涂层界面附近诱发了更多的缺陷（如裂纹），并促进了腐蚀介质（如S）向内扩散，从而加速了合金和涂层的腐蚀；与无应力情况相比，结垢厚度和内部腐蚀渗透深度也显著增加。然而，铝化物涂层仍然有效地保护了合金。应力对其耐腐蚀性的不利影响不如对合金的不利影响明显，证实了其作为耐应力保护系统的潜力。这项工作为设计在恶劣环境中运行的燃气轮机部件的抗应力涂层提供了关键的见解。

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来源期刊

Surface & Coatings Technology 工程技术-材料科学：膜

CiteScore

10.00

自引率

11.10%

发文量

921

审稿时长

19 days

期刊介绍： Surface and Coatings Technology is an international archival journal publishing scientific papers on significant developments in surface and interface engineering to modify and improve the surface properties of materials for protection in demanding contact conditions or aggressive environments, or for enhanced functional performance. Contributions range from original scientific articles concerned with fundamental and applied aspects of research or direct applications of metallic, inorganic, organic and composite coatings, to invited reviews of current technology in specific areas. Papers submitted to this journal are expected to be in line with the following aspects in processes, and properties/performance: A. Processes: Physical and chemical vapour deposition techniques, thermal and plasma spraying, surface modification by directed energy techniques such as ion, electron and laser beams, thermo-chemical treatment, wet chemical and electrochemical processes such as plating, sol-gel coating, anodization, plasma electrolytic oxidation, etc., but excluding painting. B. Properties/performance: friction performance, wear resistance (e.g., abrasion, erosion, fretting, etc), corrosion and oxidation resistance, thermal protection, diffusion resistance, hydrophilicity/hydrophobicity, and properties relevant to smart materials behaviour and enhanced multifunctional performance for environmental, energy and medical applications, but excluding device aspects.