摘要
目的研究Al/BN封严涂层在海洋环境下的腐蚀历程。方法使用扫描电镜(SEM)、X射线衍射(XRD)、电化学等测试方法,对Al/BN封严涂层在盐雾环境中的腐蚀行为、形貌、显微结构、相组成及耐腐蚀等性能进行研究,分析Al/BN封严涂层在盐雾试验中的电化学腐蚀过程。结果在96 h盐雾试验中,Al/BN封严涂层的腐蚀过程分为2个阶段,分别为孔蚀形成期和孔蚀发展期。在前72 h的盐雾腐蚀时间里,Al/BN封严涂层的腐蚀产物对于孔洞的堵塞越来越严重,自腐蚀电流密度也处于下降状态,表明Al/BN封严涂层的腐蚀产物有效地阻止了腐蚀速度的加剧。在第2阶段,阻抗值有所下降,是因为腐蚀产物龟裂或孔洞内局部酸化造成。结论Al/BN涂层的腐蚀产物对Al/BN封严涂层的自腐蚀速率有比较大的影响。
This research aims to study the corrosion process of Al/BN sealing coating in marine environment,the corrosion behaviors,morphology,microstructure,phase composition and corrosion resistance of Al/BN sealing coating in salt spray envi-ronment were studied by scanning electron microscope(SEM),X-ray diffraction(XRD),electrochemistry,etc.The electro-chemical corrosion process of Al/BN sealing coating in salt spray test was analyzed.The results showed that in the 96h salt spray test,the corrosion process of the Al/BN sealing coating can be divided into two stages:etched pinhole formation and de-velopment.In the first 72 h of salt spray test,the corrosion product of the Al/BN sealing coating blocked the pinholes more and more seriously,and the corrosion current density decreased,indicating that the corrosion products of the Al/BN sealing coating can effectively decrease corrosion rate.In the pinhole development stage,the value of the impedance decreased due to the cracking of the corrosion products or local acidification inside the holes.In conclusion,the corrosion products of Al/BN coating have a great influence on the corrosion rate of Al/BN sealing coating.
作者
杨国昊
孙杰
宋佳
刘天
孙海静
王保杰
YANG Guo-hao;SUN Jie;SONG Jia;LIU Tian;SUN Hai-jing;WANG Bao-jie(School of Environmental and Chemical Engineering,Shenyang University of Science and Technology,Shenyang 110159,China;AECC Shenyang Liming Aero-Engine Co.,Ltd.,Shenyang 110043,China)
出处
《装备环境工程》
CAS
2022年第11期77-83,共7页
Equipment Environmental Engineering
基金
沈阳理工大学高水平成果建设项目(SYLUXM202105)
科研创新团队支持项目(SYLUTD202004)。
关键词
盐雾环境
Al/BN封严涂层
腐蚀电流密度
阻抗
腐蚀产物
耐蚀性
salt-sprayenvironment
Al/BN sealing coating
corrosion current density
corrosion products
impedance
corro-sion resistance
