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Corrosion Properties of Steel Sheet with Zinc-base Alloyed Coatings |
Guangrui JIANG1,2(), Haiquan WANG1,2,3, Min LI1, Guanghui LIU1,2, Chunqian XIE1,2 |
1 Shougang Group Co., Ltd. Research Institute of Technology, Beijing 100043, China 2 Beijing Key Laboratory of Green Recyclable Process for Iron & steel Production Technology, Beijing 100043, China 3 National Engineering Lab of Advanced Coating Technology for Metal Materials, China Iron and Steel Research Institute Group (CISRI), Beijing 100081, China |
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Abstract Three hot-dip galvanizing coatings i.e. pure Zn, Zn-5%Al and Zn-2%Al-2%Mg were prepared respectively on sheets of a commercial interstitial free (IF) steel by a hot-dip process simulator (HDPS). Corrosion behavior of the coated steel sheets was studied by means of immersion test, electrochemical measurement and scanning electron microscope (SEM). Results show that the Zn-Al-Mg coating has the largest corrosion current density at the early stage of immersion. While with the increasing immersion time, the corrosion current density of the Zn-Al-Mg decreases but those of the pure Zn and Zn-5%Al coatings increase. For the Zn-5%Al coating, diffusion characteristics could be found for its Nyquist curve, which means higher corrosion rate. However, for the Zn-Al-Mg coating, limited diffusion characteristics could be found for its Nyquist curve, which means a perfect coverage of corrosion products on the coating surface, in other word, the corrosion resistance was enhanced.
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Received: 19 July 2016
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Fund: Supported by Beijing Science and Technology Project (D15110300350000) |
About author: These authors contributed equally to this work. |
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