| LU Jin-tang,WANG Ran-yuan,KONG Gang.Corrosion Behavior of Hot Dip Galvanized Coating in Saturated Ca(OH)2Solution[J],39(1):30-33 |
| Corrosion Behavior of Hot Dip Galvanized Coating in Saturated Ca(OH)2Solution |
| Received:August 11, 2009 Revised:February 10, 2010 |
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| DOI： |
| KeyWord:Hot-dip galvanizing Simulated concrete pore solution Corrosion products Electrochemical measurement |
| Author | Institution |
| LU Jin-tang |
South China University of Technology, Guangzhou , China |
| WANG Ran-yuan |
South China University of Technology, Guangzhou , China |
| KONG Gang |
South China University of Technology, Guangzhou , China |
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| Abstract: |
| Hot-dip galvanizing is one of the efficient measures to protect rebarin concrete. The hot dip galvanized samples were immersed into the saturated Ca(OH)2solution, which was adopted as pore concrete simulating solutions, with differentimmersion time,and tested by the electrochemical measurement. The micro-structure on the surface of the samples were observed by scanning electron microscopy(SEM), the chemical composition and phases of the corrosion products were analyzed by energy dispersive spectrometry(EDS)and X-ray diffraction(XRD). The results show that, during the immersion process, some tiny holes are occurred along the zinc grain boundary with the corrosion reaction between zinc and the solution at the initial time, then the calcium hydroxyzincate Ca[Zn(OH)3]2·2H2O(CaHZn)crystal are formed near the tiny holes and grown steadily,while the anti-corrosion of the products film is increasing accordingly. When the calcium hydroxyzincate crystal film covers the surface of the samples, the zinc coating is passivated and the corrosion current density is almost similar to passivation threshold. |
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