刘璇,邵晓峰,高瑾,李永红,胡添奇,梁帅,宋嘉良,肖葵.304不锈钢和5083铝合金在模拟城市地下空间环境中的腐蚀行为对比[J].表面技术,2022,51(11):287-294, 317.
LIU Xuan,SHAO Xiao-feng,GAO Jin,LI Yong-hong,HU Tian-qi,LIANG Shuai,SONG Jia-liang,XIAO Kui.Comparative Study on the Corrosion Behavior of 304 Stainless Steel and 5083-aluminum Alloy in Simulated Urban Underground Environment[J].Surface Technology,2022,51(11):287-294, 317
304不锈钢和5083铝合金在模拟城市地下空间环境中的腐蚀行为对比
Comparative Study on the Corrosion Behavior of 304 Stainless Steel and 5083-aluminum Alloy in Simulated Urban Underground Environment
  
DOI:10.16490/j.cnki.issn.1001-3660.2022.11.027
中文关键词:  304不锈钢  5083铝合金  地下环境  点蚀  腐蚀行为  环境谱
英文关键词:304 stainless steel  5083-aluminum alloy  underground environment  pitting corrosion  corrosion behavior  environmental spectrum
基金项目:
作者单位
刘璇 北京科技大学 腐蚀与防护中心,北京 100083 
邵晓峰 株洲中车时代电气股份有限公司,湖南 株洲 412001 
高瑾 北京科技大学 腐蚀与防护中心,北京 100083 
李永红 株洲中车时代电气股份有限公司,湖南 株洲 412001 
胡添奇 株洲中车时代电气股份有限公司,湖南 株洲 412001 
梁帅 北京科技大学 腐蚀与防护中心,北京 100083 
宋嘉良 北京科技大学 腐蚀与防护中心,北京 100083 
肖葵 北京科技大学 腐蚀与防护中心,北京 100083 
AuthorInstitution
LIU Xuan Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China 
SHAO Xiao-feng Zhuzhou CRRC Times Electric Co., Ltd., Hunan Zhuzhou 412001, China 
GAO Jin Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China 
LI Yong-hong Zhuzhou CRRC Times Electric Co., Ltd., Hunan Zhuzhou 412001, China 
HU Tian-qi Zhuzhou CRRC Times Electric Co., Ltd., Hunan Zhuzhou 412001, China 
LIANG Shuai Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China 
SONG Jia-liang Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China 
XIAO Kui Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China 
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中文摘要:
      目的 研究对比了304不锈钢与5083铝合金在模拟武汉地下空间环境条件下的腐蚀行为。方法 在对武汉工况调研的基础上,设计了符合地下环境特点的室内加速试验谱,包括循环盐雾试验和湿热试验等,以一个加速周期模拟实际服役环境中1 a的腐蚀量;利用扫描电子显微镜(SEM)、激光共聚焦显微镜等方法分析了304不锈钢与5083铝合金的表面形貌、腐蚀产物成分和腐蚀动力学等。结果 根据模拟武汉地下空间环境设计的加速试验,经过5个循环周期后,不锈钢与铝合金均在局部发生不同程度的点蚀,5083铝合金表面钝化膜被破坏,腐蚀产物堆积,而304不锈钢腐蚀轻微。根据拟合结果,不锈钢最大点蚀深度与腐蚀时间时间符合指数函数关系D1=7.637+1.212e0.517t,形成的腐蚀坑小而深;铝合金符合幂函数关系D2=11.75t0.699,主要形成宽而浅的腐蚀坑,其宽深比逐渐增加。结论 随着服役时间的延长,304不锈钢在模拟城市地下空间环境中的点蚀深度发展较5083铝合金更快,304不锈钢的点蚀率受地下运行环境的影响逐年增加,而5083铝合金局部腐蚀放缓。
英文摘要:
      According to the characteristics of Wuhan's underground environment, the author investigated the dynamic changes of the natural environment involved in Wuhan's underground, and calculated the annual operating time of facilities based on the operating conditions. At the same time, referring to the conversion coefficients of different metal materials, the environmental strength, duration and sequence were clarified, so as to design an indoor test spectrum that simulated the environmental corrosion equivalent of Wuhan. In this paper, the corrosion behavior of 304 stainless steel and 5083 aluminum alloy under simulated environmental spectrum was compared. One acceleration cycle was used to simulate the corrosion amount of 1 year in the actual service environment. In the corrosion cycle spectrum simulated for 1 year, the drying/humid heat test cycle was 3 times, the salt spray/humid cycle test was 3 times for stainless steel, and the salt spray/humid cycle test was 5 times for aluminum alloy. After completing the salt spray/humid cycle, the cleaning part was entered. Both 304 stainless steel and 5083 aluminum alloy were tested for 5 acceleration cycles to simulate the corrosion equivalent of 5 years in the actual environment. The surface morphology, composition of corrosion products and corrosion dynamics of 304 stainless steel and 5083 aluminum alloy were analyzed by scanning electron microscopy (SEM) and laser confocal microscopy. Results show that after 5 cycles, both stainless steel and aluminum alloy had local pitting corrosion to varying degrees. The passivation film on the surface of 5083 aluminum alloy was destroyed and the product accumulated, while the corrosion of 304 stainless steel was slight and had better resistance to pitting, which may be due to the formation of a passivation film on the surface. The main components of films were oxides containing Fe and Cr, and the passivation film could be the main source of the corrosion resistance of stainless steel. In line with the fitting results of the maximum pitting depth, the pitting depth of stainless steel and the corrosion time conforms to the exponential function relationship D1=7.637+1.212e0.517t, and the pits were small and deep, and the depth was increasing continuously. Aluminum alloy conforms to the power function relationship D2=11.75t0.699, so 5083-aluminum alloy mainly formed wide and shallow corrosion pits with a width-to-depth ratio increasing gradually. The corrosion dendrity decreases gradually, and tends to a lower state infinitely. For aluminum alloy, active ions in service environment will lead to the dissolution of passivation film, inducing surface pitting. However, the dissociation diffusion of Cl‒ was affected after the drying/humid heat cycle test, and the ion transfer of the cathode reaction was limited, resulting in a decrease in the rate of the cathode reaction. At the same time, the corrosion products on aluminum alloy surface also hindered the further development of pitting pits. The experiment of simulating the environmental conditions of the underground space in Wuhan shows that with the extension of service time, the pitting corrosion depth of 304 stainless steel in the simulated urban underground space environment develops faster than 5083 aluminum alloy. The pitting depth of 304 stainless steel is affected by the underground operating environment, and will increase year by year; However, the local corrosion of 5083 aluminum alloy will slow down due to the hindering effect of surface passivation film and corrosion products.
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