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| Corrosion Performance and Surface Characteristics of Al/BN Sealing Coating in Salt Spray Environment |
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| DOI：10.7643/issn.1672-9242.2022.11.011 |
| KeyWord:salt-sprayenvironment Al/BN sealing coating corrosion current density corrosion products impedance corrosion resistance |
| Author | Institution |
| YANG Guo-hao |
School of Environmental and Chemical Engineering, Shenyang University of Science and Technology, Shenyang , China |
| SUN Jie |
School of Environmental and Chemical Engineering, Shenyang University of Science and Technology, Shenyang , China |
| SONG Jia |
AECC Shenyang Liming Aero-Engine Co., Ltd., Shenyang , China |
| LIU Tian |
School of Environmental and Chemical Engineering, Shenyang University of Science and Technology, Shenyang , China |
| SUN Hai-jing |
School of Environmental and Chemical Engineering, Shenyang University of Science and Technology, Shenyang , China |
| WANG Bao-jie |
School of Environmental and Chemical Engineering, Shenyang University of Science and Technology, Shenyang , China |
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| Abstract: |
| 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 environment were studied by scanning electron microscope (SEM), X-ray diffraction (XRD), electrochemistry, etc. The electrochemical 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 development. 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. |
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