Influence of the conversion coating on the corrosion of galvanized reinforcing steel |
| |
| Affiliation: | 1. College of Mechanics and Materials, Hohai University, Nanjing 210098, PR China;2. Nanjing Hydraulic Research Institute, Nanjing, PR China;1. Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China;2. Institute of Structural Engineering, Zhejiang University, Hangzhou 310058, China;2. Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria;1. Center for Marine Materials Corrosion and Protection, College of Materials, Xiamen University, 422 S. Siming Rd, Xiamen, Fujian, 361005, China;2. State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, 422 S. Siming Rd, Xiamen, Fujian, 361005, China |
| |
| Abstract: | Galvanized reinforcing steel with a cerium conversion coating have been studied in Ca(OH)2 saturated solution with and without chlorides. Electrochemical results reveal that cerium conversion coating provides an effective corrosion resistance compared to galvanized steel at short immersion times, 5 days without Cl− ions and 2 days with Cl− in the solution. The results suggest that cerium layer inhibits hydrogen evolution on the galvanized coating at early stages. At longer immersion times, galvanized steel with cerium conversion coating and galvanized steel describe similar corrosion behaviour in both electrolytes. There is not significant differences in the corrosion current density, about 5 μA/cm2, due to the presence of chlorides ions in the Ca(OH)2 saturated solution up to approximately 17 days of immersion. At longer immersion times, from 30 to 50 days, specimens in the chlorides containing solution exhibit higher corrosion activity than that recorded in the free Cl− solution revealing that cerium layer cannot inhibit the localized attack promoted by chloride ions. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
