| FENG Li-jun,DONG Peng-fei,CHENG Zheng-chong,LIU Lin,DONG Chao-fang,LI Xiao-gang,XIAO Kui.Corrosion Behaviorof Galvanized Sheet in Different Accelerated Corrosion Environment[J],46(8):246-253 |
| Corrosion Behaviorof Galvanized Sheet in Different Accelerated Corrosion Environment |
| Received:February 20, 2017 Revised:August 20, 2017 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2017.08.040 |
| KeyWord:galvanized sheet accelerated corrosion test neutral salt spray test periodic immersion corrosion test heat and humidity test |
| Author | Institution |
| FENG Li-jun |
Southwest Technology and Engineering Research Institute, Chongqing , China |
| DONG Peng-fei |
Corrosion and Protection Center, University of Science and Technology Beijing, Beijing , China |
| CHENG Zheng-chong |
Southwest Technology and Engineering Research Institute, Chongqing , China |
| LIU Lin |
Corrosion and Protection Center, University of Science and Technology Beijing, Beijing , China |
| DONG Chao-fang |
1.Corrosion and Protection Center, University of Science and Technology Beijing, Beijing , China; 2.Key Laboratory for Corrosion and Protection MOE, University of Science and Technology Beijing, Beijing , China |
| LI Xiao-gang |
1.Corrosion and Protection Center, University of Science and Technology Beijing, Beijing , China; 2.Key Laboratory for Corrosion and Protection MOE, University of Science and Technology Beijing, Beijing , China |
| XIAO Kui |
1.Corrosion and Protection Center, University of Science and Technology Beijing, Beijing , China; 2.Key Laboratory for Corrosion and Protection MOE, University of Science and Technology Beijing, Beijing , China |
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| Abstract: |
| The work aims to study corrosion behavior of galvanized sheet in neutral salt spray, neutral salt spray & periodic immersion as well as neutralsalt spray &heat and humidity environments, so as to clarify effects of different accelerated corrosion test environment on corrosion behavior of galvanized sheet. Different kinds of accelerated corrosion test including neutral salt spray, neutral salt spray & periodic immersion as well as neutralsalt spray &heat and humidity environments were performed to galvanized sheet. Effects of different accelerated corrosion test types on corrosion behavior of galvanized sheet were compared in weight loss method and using SEM, XRD and polarization curve. Corrosion process of galvanized sheet was basically the same in three accelerated corrosion environment: zinc coating and white zinc were rusted and corroded, zinc coating fractured and fell off completely, and substrate carbon steel was corroded. Corrosion products were mainly Zn(OH)2, γ-FeOOH, ZnO, Fe2O3. Galvanized sheet was corroded unevenly in three environment, and corrosion conditions varied in different positions. Corrosion of galvanized sheet was most serious in neutral salt spray environment, more serious in neutral salt spray & periodic immersion environment, and the least in neutralsalt spray & heat and humidity environment. Three accelerated environments enhances conductivity of the medium based upon deposition and dissolution of Cl－ on zinc surface, and accelerates corrosion of zin coating. Cl－ concentration is the highest, and sample corrosion is the worst in neutral salt spray environment. SO42－ and Cl－ have synergistic effect and corrosion is relatively severe in salt spray and periodic immersion environment. The Cl－ is diluted and corrosion is slight in neutralsalt spray &heat and humidity environment. |
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