((1. 上海交通大學(xué) 金屬基復(fù)合材料國(guó)家重點(diǎn)實(shí)驗(yàn)室，上海 200240；2. 北京科技大學(xué) 北京市腐蝕、磨蝕與表面技術(shù)重點(diǎn)實(shí)驗(yàn)室，北京 100083；3. 河北科技大學(xué) 材料學(xué)院，石家莊 050054))
摘 要:
關(guān)鍵字: 鋁化物涂層；Q235鋼；電脈沖沉積；微晶化涂層；高溫腐蝕
（(1. State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China; 2. Beijing Key Laboratory for Corrosion, Erosion and Surface Technology, University of Science and Technology Beijing, Beijing 100083, China;3. School of material, Hebei University of Science and Technology, Shijiazhuang 050054, China)）
Abstract:Vibrating electro-spark deposition equipment is developed to prepare metal coatings with high deposition efficiency. An Fe-Al intermetallic compound layer is formed by the high temperature plasma during the instant discharge between Al electrode and specimen. The coatings formed on Q235 steel possess microcrystalline structure, with a thickness about 100 m. The micro-crystal line structure is achieved due to the high cooling rate during deposition. The quality of the coatings is enhanced by using Ar to protect samples from oxidation. The coatings are metallurgically bonded to the substrate without obvious interface. The samples with aluminide coatings for oxidation were put in air at 600 ℃ for 200 h, and those for sulfuration were put in flowing 99.98% SO2 at 600℃ for 50 h, and then SEM, EDS and XRD analyses were performed to understand the oxidation and sulfuration mechanisms of the coatings. The results show that the high temperature oxidation and sulfuration resistance of samples with aluminide coatings are improved remarkably.
Key words: iron aluminide coating; Q235 steel; electro-pulse deposition; microcrystalline structure; high temperature corrosion
