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Journal of Chinese Society for Corrosion and protection  2024, Vol. 44 Issue (2): 405-412    DOI: 10.11902/1005.4537.2023.146
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Bifunctional Calcium Aluminate Modified Silica Sol Coating for Reinforced Bar
YANG Shengjie1, GAO Yan1, GAO Xu1, ZHAO Peng2,3, WU Wei1, YU Jinshan2,3, ZHANG Junxi1()
1.Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai University of Electric Power, Shanghai 200090, China
2.State Grid Tianjin Electric Power Research Institute, Tianjin 300384, China
3.Tianjin Key Laboratory of Internet of Things in Electricity, Tianjin 300384, China
Cite this article: 

YANG Shengjie, GAO Yan, GAO Xu, ZHAO Peng, WU Wei, YU Jinshan, ZHANG Junxi. Bifunctional Calcium Aluminate Modified Silica Sol Coating for Reinforced Bar. Journal of Chinese Society for Corrosion and protection, 2024, 44(2): 405-412.

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Abstract  

A silica sol coating for corrosion protection of reinforce bars in concrete structures was prepared via mechanical blending and ultrasonic dispersion with water glass as the film precursor and calcium aluminate as filler. Then the effect of different amounts of calcium aluminate addition on the protective performance of the coating was studied. The structural morphology and ion exchange ability of calcium aluminate and its hydrates, as well as the structural morphology and protective performance of the coating were characterized by XRD, FT-IR, SEM, ion chromatograph analysis and electrochemical measurement. The results indicate that calcium aluminate can be hydrated to form LDH during the coating preparation, thus due to their anion exchange function, LDHs can absorb corrosive chloride ions from corrosive media, meanwhile, the layered structure of LDHs may be benefit to alleviate the internal stress generated during the coating curing process, in turn, eliminate the cracking in the coating and improve effectively the barrier performance of the coating, while slow down the infiltration rate of chloride ions and other corrosive ions reaching the surface of the steel bar, eventually enhance the protective performance of the silica sol coating against the steel bar corrosion.
Key words:  calcium aluminate      silica sol      coating      a steel bar      anion exchange      functional filler     
Received:  08 May 2023      32134.14.1005.4537.2023.146
ZTFLH:  TG174  
Fund: State Grid Tianjin Electric Power Company Science and Technology Project(KJ21-1-12)
Corresponding Authors:  ZHANG Junxi, E-mail: zhangjunxi@shiep.edu.cn
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YANG Shengjie
GAO Yan
GAO Xu
ZHAO Peng
WU Wei
YU Jinshan
ZHANG Junxi

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.146     OR     https://www.jcscp.org/EN/Y2024/V44/I2/405

Fig.1  The variational of anion exchange capacity of C3A to chloride ions with time
Fig.2  SEM morphologies of C3A before (a) and after (b, c) ion exchange, and EDS results of the exchanged C3A sample (d)
Fig.3  C3A Infrared spectrum before and after ion exchange
Fig.4  XRD patterns of C3A Sample before and after ion exchange
Fig.5  XRD patterns of silica sol coating with and without C3A added
Fig.6  SEM morphologies of cross-section of the coating before (a) and after (b) adding C3A
Fig.7  Polarization curves of coating samples with different dosage of C3A
Additive / gEcorr / V vs SCEI0 / A·cm-2
Blank-0.641.09 × 10-6
0.2 g-0.5504.4 × 10-9
0.5 g-0.3753.08 × 10-10
0.8 g-0.5795.24 × 10-9
Table 1  Polarization curve fitting data of coatings with different additives
Fig.8  Bode diagram with different addition amounts: (a1, a2) no coating added, (b1, b2) adding 0.2 g C3A coating, (c1, c2)adding 0.5 g C3A coating, (d1, d2) adding 0.8 g C3A coating
Fig.9  Equivalent circuit for coatings with additives blank and 0.8 g sample (a), 0.2 g and 0.5 g sample (b)
Fig.10  Changes in Rf (a) and Rct (b) of the coating over time
Sample

Time

d

CPE1

nΩ-1·S n ·cm-2

Freq1

Rf

Ω·cm2

CPE2

nΩ-1·S n ·cm-2

Freq2

Rct

Ω·cm2

W
0.2 g17.09 × 10-100.91042.58 × 1081.261 × 10-70.65325.09 × 108/
38.808 × 10-90.85035.82 × 1078.504 × 10-100.91164.75 × 107/
56.661 × 10-100.91782.30 × 1071.269 × 10-80.64422.48 × 107/
76.17 × 10-110.63121.22 × 1074.929 × 10-110.65641.53 × 107/
91.708 × 10-110.90015.05 × 1066.351 × 10-90.5151.24 × 107/
111.609 × 10-90.59242.30 × 1061.165 × 10-50.70874.70 × 1068.794 × 1012
132.384 × 10-60.643716731.21 × 10-50.7477516901.097 × 10-17
153.184 × 10-60.6451557.51.336 × 10-50.73674.97 × 1043.428 × 10-16
0.5 g17.425 × 10-100.94112.88 × 1081.594 × 10-100.93086.68 × 108/
38.501 × 10-100.89171.07 × 1087.441 × 10-100.89.76 × 107/
59.217 × 10-100.8884.09 × 1072.038 × 10-80.55389.45 × 107/
75.738 × 10-80.83.62 × 1077.538 × 10-100.90592.11 × 107/
98.977 × 10-100.90891.21 × 1075 × 10-80.81.65 × 107/
114.398 × 10-90.83471.95 × 1061.1 × 10-70.66231.62 × 1071.723 × 10-6
131.967 × 10-80.7934397104.309 × 10-70.67471.45 × 1074.38 × 10-8
151.117 × 10-70.7301123101.55 × 10-60.6821.34 × 1071 × 1020
0.8 g17.439 × 10-100.91055.95 × 1062.162 × 10-80.59734.37 × 1087.5 × 10-7
36.956 × 10-100.91354.11 × 1061.811 × 10-80.60731.50 × 1077.5 × 10-7
51.331 × 10-80.82843.75 × 1068.562 × 10-100.90781.60 × 1074.679 × 10-7
75.368 × 10-80.2542.63 × 1061.466 × 10-90.85321.30 × 1074.804 × 10-7
96.631 × 10-90.92091.17 × 1062.861 × 10-70.5189.51 × 1061.385 × 10-5
111.173 × 10-90.92921.02 × 1065.268 × 10-80.43798.86 × 1063.668 × 10-5
131.823 × 10-90.92418823004.362 × 10-80.55156.27 × 1061.855 × 10-6
151.999 × 10-80.8314419204.995 × 10-70.62291.20 × 1063.526 × 10-7
Table 2  Fit values of coatings with different additives
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