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中国腐蚀与防护学报  2024, Vol. 44 Issue (2): 405-412     CSTR: 32134.14.1005.4537.2023.146      DOI: 10.11902/1005.4537.2023.146
  研究报告 本期目录 | 过刊浏览 |
双功能铝酸钙改性硅溶胶钢筋涂层
杨胜杰1, 高燕1, 高旭1, 赵鹏2,3, 吴伟1, 于金山2,3, 张俊喜1()
1.上海电力大学 电力材料防护与新材料上海市重点实验室 上海 200090
2.国网天津市电力公司电力科学研究院 天津 300384
3.天津市电力物联网企业重点实验室 天津 300384
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
引用本文:

杨胜杰, 高燕, 高旭, 赵鹏, 吴伟, 于金山, 张俊喜. 双功能铝酸钙改性硅溶胶钢筋涂层[J]. 中国腐蚀与防护学报, 2024, 44(2): 405-412.
Shengjie YANG, Yan GAO, Xu GAO, Peng ZHAO, Wei WU, Jinshan YU, Junxi ZHANG. Bifunctional Calcium Aluminate Modified Silica Sol Coating for Reinforced Bar[J]. Journal of Chinese Society for Corrosion and protection, 2024, 44(2): 405-412.

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摘要: 

制备了一种用于混凝土结构中钢筋表面腐蚀防护的硅溶胶涂层，以水玻璃为前驱体，在涂层制备中引入铝酸钙填料，研究了铝酸钙(C3A)不同添加量对涂层防护性能的影响。采用XRD、FT-IR、SEM、离子色谱仪以及电化学测量技术对C3A及水化物的结构形貌、离子交换能力、涂层的结构形貌及腐蚀防护性能进行表征。结果表明，铝酸钙在涂料制备中可以水化形成LDH，且水化后的LDHs具有的阴离子交换功能，可吸附腐蚀介质中的侵蚀性Cl-。同时LDHs本身的片层状结构有助于缓解涂层固化过程中产生的内应力，消除涂层产生的开裂，且可有效提高涂层的阻隔性能，减缓Cl-等侵蚀性离子到达钢筋表面的速率，进而提升硅溶胶涂层对钢筋腐蚀的防护性能。
关键词 ： 铝酸钙,  硅溶胶,  涂层,  钢筋,  阴离子交换,  功能填料    
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
收稿日期: 2023-05-08      32134.14.1005.4537.2023.146
ZTFLH:  TG174  
基金资助:国网天津市电力公司科技项目(KJ21-1-12)
通讯作者: 张俊喜，E-mail：zhangjunxi@shiep.edu.cn，研究方向为金属腐蚀与防护
Corresponding author: ZHANG Junxi, E-mail: zhangjunxi@shiep.edu.cn
作者简介: 杨胜杰，女，1997年生，硕士生
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杨胜杰
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https://www.jcscp.org/CN/10.11902/1005.4537.2023.146      或      https://www.jcscp.org/CN/Y2024/V44/I2/405

图1  C3A对Cl-的交换容量随时间的变化
图2  C3A离子交换前后SEM形貌和交换后C3A的EDS分析
图3  C3A离子交换前后的红外谱图
图4  C3A离子交换前后的XRD
图5  添加C3A涂层与未添加涂层的XRD谱
图6  添加C3A前后涂层截面SEM图
图7  不同添加量涂层样品的极化曲线
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
表1  不同添加量涂层的极化曲线拟合数据
图8  不同添加量涂层的Bode图
图9  不同添加量的涂层等效电路
图10  涂层Rf及Rct随时间变化图
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
表2  不同添加量的涂层的拟合值
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