海南滨海大气环境中棘孢曲霉对铝合金腐蚀行为影响  

Effect of Aspergillus Aculeatus on Corrosion Behavior of 5A02 Al-alloy in Coastal Atmospheric Environment of Hainan Island

作　　者：宋晓稳 白苗苗 陈娜娜 高逸晖[3] 冯亚丽 刘倩倩 张尧尧 卢琳 吴俊升 肖葵 SONG Xiaowen;BAI Miaomiao;CHEN Nana;GAO Yihui;FENG Yali;LIU Qianqian;ZHANG Yaoyao;LU Lin;WU Junsheng;XIAO Kui(Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China;Technical Center of Guangzhou Automobile Parts Co.,Ltd.,Guangzhou 510050,China;Twentieth Research Institute of China Electronics Technology Corporation,Xi'an 710068,China;School of Life Sciences,Central China Normal University,Wuhan 430079,China)

机构地区：[1]北京科技大学新材料技术研究院,北京100083 [2]广汽零部件有限公司技术中心,广州510050 [3]中国电子科技集团公司第二十研究所,西安710068 [4]华中师范大学生命科学学院,武汉430079

出　　处：《中国腐蚀与防护学报》2025年第3期631-642,共12页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金(51971032和52071019)。

摘　　要：通过模拟海南滨海大气环境来研究棘孢曲霉对5A02铝合金的腐蚀行为影响机理。利用平板培养法筛选出棘孢曲霉,将其孢子悬浮液滴到试样表面并设置对照组,置于30℃恒温箱中,利用扫描电子显微镜(SEM)、能谱仪(EDS)和X射线光电子能谱(XPS)对试样表面腐蚀形貌和成分进行分析,并观察霉菌的生长状态。使用电化学工作站及扫描Kelvin探针(SKP)分析铝合金表面不同时间棘孢曲霉作用下的腐蚀电位。结果表明,棘孢曲霉会对铝合金材料造成局部腐蚀,腐蚀产物主要由AlO(OH)、Al_(2)O_(3)和MgO组成。棘孢曲霉生命活动会产生以草酸为主的多种有机酸,造成环境pH值出现先降低后上升的趋势,可加速腐蚀过程。有菌组的电位变化幅度更大且整体电位较无菌组更负,且有菌组电位随着时间的变化先升高后降低。腐蚀机理主要为霉菌代谢产物腐蚀和氧浓差腐蚀,Cl起到促进霉菌生长和加速腐蚀的作用。To study the influence of Aspergillus aculeatus on the corrosion behavior of Al-alloys,the single colony of Aspergillus aculeatus was isolated and screened from the petri dishes exposed to the coastal atmospheric environment of Hainan Island.The diluted spore suspension of Aspergillus aculeatus with concentration of 1×105/mL was sprayed on the surface of 5A02 Al-alloy samples as groups inoculated with fungi,and sterile control groups were also set up,thereafter,which all placed in a 30 o C incubator for selected period of time,while the pH and acid concentration of the bacterial solution were measured intermittently.The test samples were characterized using scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS)and X-ray photoelectron spectroscopy(XPS)in terms of their surface morphology and composition,and the growth of fungi was also observed.The corrosion potential of the Al-alloys surface under the action of Aspergillus aculeatus for different time were analyzed by electrochemical workstation and scanning Kelvin probe(SKP).Results indicated that Aspergillus aculeatus caused localized corrosion of the Al-alloy samples,their corrosion products mainly composed of AlO(OH),Al_(2)O_(3),and MgO.The metabolic activities of Aspergillus aculeatus produced various organic acids,primarily oxalic acid,leading to a trend of decreasing and then increasing in the surrounding pH,thereby promoting the corrosion of the Al-alloy.The range of potential change of the group with fungi was greater,with overall potentials more negative than that of the sterile group.The potential of the group with fungi,initially increased and then decreased with time.The corrosion mechanisms primarily involved fungi metabolite corrosion and oxygen-concentration cell corrosion,while the chloride ions play a role in facilitating the growth of fungi and accelerating the corrosion.

关 键 词：棘孢曲霉 滨海大气环境 铝合金 腐蚀形貌 腐蚀电位 腐蚀机理 

分 类 号：TG172.3[金属学及工艺—金属表面处理]