不锈钢在乙醇燃烧气氛环境中的腐蚀行为研究  

Corrosion Behavior of 304 Stainless Steel in Simulated Ethanol Fire Atmosphere

作　　者：谢冬柏 赖天 汤智杰 多树旺[2] 邓时 XIE Dongbai;LAI Tian;TANG Zhijie;DUO Shuwang;DENG Shi(University Featured Laboratory of Materials Engineering for Agricultural Machinery of Shandong Province,Weifang University of Science and Technology,Shouguang 262700,China;Jiangxi Key Laboratory of Materials Surface Engineering,Jiangxi Science and Technology Normal University,Nanchang 330013,China;Department of Forensic Science,Xinjiang Police College,Urumqi 830011,China)

机构地区：[1]潍坊科技学院山东省农机装备用材料工程高校特色实验室,寿光262700 [2]江西科技师范大学江西省材料表面工程重点实验室,南昌330013 [3]新疆警察学院刑事技术系,乌鲁木齐830011

出　　处：《中国腐蚀与防护学报》2025年第1期237-243,共7页Journal of Chinese Society For Corrosion and Protection

基　　金：潍坊科技学院高层次人才科研启动项目(KJRC2021007)。

摘　　要：本文使用自研的火灾环境模拟系统模拟了乙醇助燃剂的火场现场环境,研究了304不锈钢在热空气和乙醇助燃剂燃烧气氛中600~800 ℃时,表面氧化产物的变化及其氧化行为特征。通过对比分析试样在乙醇燃烧气氛和空气中的氧化动力学、氧化层的相结构、成分组成及氧化产物的形貌特征,澄清304不锈钢在火场乙醇助燃剂燃烧环境中的氧化物生长规律及热失效行为。结果表明,乙醇燃烧气氛改变了不锈钢氧化模式,使其表面无法形成连续的保护性氧化膜,发生灾难性氧化,表面氧化层是由岛状的Fe_(2)O_(3)和Fe_(3)O_(4)构成。乙醇助燃剂燃烧所形成的氧化性气氛和湍流会加速不锈钢中Cr的消耗,从而使表面发生灾难性氧化导致氧化层剥落,火场中温度的升高也能加速氧化腐蚀的进行。根据这些氧化特征有助于判断火场中是否有助燃剂成分存在。Combustion accelerant is a kind of highly flammable,volatile,and easily polluted substance,which is difficulty to extract and identify in the fire scenes.In order to solve the issue of identifying the accelerant,a liquid combustion atmosphere simulation system was developed in the Lab to simulate the fire environment involving ethanol accelerant.Herein,the oxidation behavior of 304 stainless steel was studied via the Lab simulation system in the combustion atmosphere of air-ethanol at 600-800 ℃ in terms of the corrosion kinetics,the composition and morphylogy of corrosion products,and the steel microstructure variations.The resuts show that the oxidation behavior of 304 stainless steel in the ethanol combustion atmosphere differ significantly from that in air,making it impossible to form a continuous protective oxide scale on its surface and thus catastrophic oxidation occurs.The surface oxide scale is composed of island-like oxide clusters of Fe_(2)O_(3)and Fe_(3)O_(4).Furthermore,oxidizing atmosphere induced by ethanol flux combustion along with turbulence will accelerate the chromium consumption from the steel,as well as enhanced the separation of oxide scale.Besides the oxidation rate also increases with the increasing test temperature.It follows that the above findings may be helpful to identify if there existed or not accelerant components in the fire scenes.

关 键 词：火灾调查 乙醇 助燃剂 模拟燃烧 氧化 

分 类 号：TG174[金属学及工艺—金属表面处理]