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| Relationship between Corrosion Initiation and Surface Morphology of Automotive Sheet in High Temperature and Humidity Environment |
| Received:April 24, 2020 Revised:May 18, 2020 |
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| DOI：10.7643/issn.1672-9242.2020.12.016 |
| KeyWord:interstitial free steel rust point initiation high-temperature and humidity environment surface morphology feature height distribution curve |
| Author | Institution |
| FANG Bai-you |
Baosteel-NSC Automotive Steel Sheets Co., Ltd., Shanghai , China |
| CHEN Heng |
Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing , China |
| LU Lin |
Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing , China |
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| Abstract: |
| The work aims to explore the influence of surface morphology on the corrosion resistance of automotive sheet in storage and transportation. The initiation laws of rust points of two kinds of interstitial free (IF) steel exposed to the simulated high-temperature and humidity environment were investigated in the early corrosion stage and the surface morphology of automotive steel sheet was characterized by white-light interferometer to explore the surface factors affecting the corrosion resistance of automotive sheet during storage and transportation. The automotive sheets with different surface morphology features could not be characterized solely by the average roughness parameter Sa. Thus, the corrosion resistance of automotive steel sheet could not be evaluated by Sa. Moreover, the surface electrochemical activity directly depended on the maximum peak height Sp and maximum valley depth Sv of IF steel surface in the initiation stage. In the stage of rust point expansion, the peak aggregation degree on the surface of automotive sheet had a more significant effect on rust point expansion. The larger the values of Sp and Sv are, the greater the speed of rust point initiation is. The higher aggregation degree of peak is, the greater the speed of rust point propagation is. The results are anticipated to provide a new perspective and possibility for enhancing the corrosion resistance of automotive sheet. |
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