(1.中國科學(xué)院金屬腐蝕與防護(hù)研究所腐蝕與防護(hù)國家重點(diǎn)實(shí)驗(yàn)室，沈陽 110015;
2.燕山大學(xué)材料系, 秦皇島 066004)
摘 要: 在一定溫度下，研究了Q235鋼在不同時(shí)間條件下熱浸鋁時(shí)鍍層的微觀結(jié)構(gòu)變化及形成機(jī)理。結(jié)果表明，浸鋁初期，在鋁鐵界面產(chǎn)生連續(xù)的FeAl3薄層；隨時(shí)間延長，由于斜方晶格Fe2Al5相的快速生長，抑制了FeAl3相的進(jìn) 一步形成，使FeAl3相由初期的連續(xù)層向非連續(xù)相層轉(zhuǎn)變， 而Fe2Al5相呈不均勻齒狀垂直于基體表面生長。通過SEM及TEM分析了鍍層形成機(jī)理并提出了鍍層的結(jié)構(gòu)模型。
關(guān)鍵字: 熱浸鋁 FeAl3 相 Fe2Al5相 微觀結(jié)構(gòu)
（1.Corrosion Science Laboratory, Institute of Corosion & Protection of Metals, Chinese Academy of Sciences, Shenyang 110015
2.Department of Material Engineering, University of Yanshan, Qin Huangdao 066004）
Abstract:The microstructure of aluminized coating and coating formation process of hot dip aluminizing (HDA) under definite temperature were investigated. It were shown, at the initial HDA stage, FeAl3 phase formed continuously between interface of Al and Fe; however, the growth of FeAl3 phase restrained by the faster growing rhombic Fe2Al5 phase with the time increasing, which causes FeAl3 phase to turn from continuous to intermittence, Fe2Al5 phase grows vertical to surface unevenly and makes HDA coating be serrated morphology. Finally, microstructure model of HDA coating and coating formation process were put foreword firstly by TEM and SEM analysis.
Key words: hot dip aluminizing(HDA) FeAl3 phase Fe2Al5 phase microstructure
