Influence of Mill Scale on Prepassivation of Rebar

doi:10.11902/1005.4537.2014.114

Journal of Chinese Society for Corrosion and protection

2015, Vol. 35

Issue (4): 359-364 DOI: 10.11902/1005.4537.2014.114

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Influence of Mill Scale on Prepassivation of Rebar

Yuanjin LI,Xinying LU(

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Department of Civil Engineering, Tsinghua University, Beijing 100084, China

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Abstract

Rebar with and without hot-rolled was prepassivated by immersion in a simulated concrete pore solution or saturated calcium hydroxide solution, as well as anodic polarization. The corrosion resistance of the pretreated rebar was examined by immersion in an artificial rain water for 24 h. The results show that the polished rebar and the rebar with hot-rolled could both be passivated in the two type alkali solutions mentioned above, but the hot-rolled could remarkably reduce the protective performance of the passive films formed on the rebar, and promote the corrosion of rebar in the artificial rain water. All the rebar prepassivated by immersion in the two solutions or anodic polarization in the present work are not able to stand against the corrosion attack of the simulated rainwater for 24 h.

Key words: rebar hot-rolled pre-passivation corrosion

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Yuanjin LI,Xinying LU. Influence of Mill Scale on Prepassivation of Rebar. Journal of Chinese Society for Corrosion and protection, 2015, 35(4): 359-364.

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https://www.jcscp.org/EN/10.11902/1005.4537.2014.114 OR https://www.jcscp.org/EN/Y2015/V35/I4/359

Fig.1 Polarization curves of two rebar samples in the simulated concrete pore solution (a), saturated calcium hydroxide solution (b) and artificial rain water (c)

Table 1 Corrosion potential and current density of two rebar samples in different solutions

Fig.2 Linear polarization curves of polished rebar

Fig.3 Changes of linear polarization resistance of two rebar samples during 120 h immersion in simulated concrete pore solution

Fig.4 Changes of linear polarization resistance of two rebar samples during 120 h immersion in saturated Ca(OH)₂ solution

Fig.5 SEM images (a, c) and EDS line scan profiles (b, d) of the cross section of rebar with hot-rolled prepassivated by immersion in saturated Ca(OH)₂ solution for 24 h (a, b) and 120 h (c, d)

Fig.6 Changes of linear polarization resistance of rebar

prepassivated in simulated concrete pore solution

during 24 h immersion in artificial rain water

Fig.7 Changes of linear polarization resistance of rebar prepassivated in saturated Ca(OH)₂ solution during 24 h immersion in artificial rain water

Fig.8 SEM images of hot-rolled rebar (a, c, e) and polished rebar (b, d, f) after immersion in artificial rain water for 4 h (a,b), 12 h (c, d) and 24 h (e, f)

Fig.9 Changes of linear polarization resistance of rebar prepassivated by anodic polarization during 24 h immersion in artificial rain water

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