Ultrahigh impedance of potassium silicate coatings hardened by calcium hydrogen phosphate

被引：6
作者：
Du, Yao [1 ,2 ]
Chen, Zheng [1 ,2 ]
Lu, Yiliang [3 ]
Wang, Cheng [4 ]
Zhu, Shenglong [2 ]
Wang, Fuhui [5 ]
机构：
[1] Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
[2] Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, Shenyang 110016, Peoples R China
[3] State Grid Smart Grid Res Inst Co Ltd, State Key Lab Adv Power Transmiss Technol, Beijing, Peoples R China
[4] Jiangsu JITRI Rd Engn Technol & Equipment Res Inst, Xuzhou 220005, Peoples R China
[5] Northeastern Univ, Shenyang Natl Lab Mat Sci, Shenyang 110819, Peoples R China
来源：
CERAMICS INTERNATIONAL | 2023年 / 49卷 / 23期
关键词：
Potassium silicate; Impedance; Structure; EIS; NMR; Raman; RAMAN; KHSI2O5;
D O I：
10.1016/j.ceramint.2023.09.124
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The potassium silicate coatings cured by calcium hydrogen phosphate (CHP) at 25, 120 and 200 degrees C were investigated using electrochemical impedance spectroscopy, scanning electron microscope, X-ray diffraction, Raman spectra and Silicon-29 nuclear magnetic resonance spectra. The potassium silicate coating cured by 10 wt% CHP at 120 degrees C exhibited ultrahigh low-frequency impedance, represented by Z(0.01), similar to 61 G Omega cm(2), which is 3 orders of magnitude higher than that of the reference coating which was cured by 15 wt% AlPO4 at 120 degrees C. It is revealed that the impedance is strongly dependent on the amounts of micron-sized defects rather than the polymerization degree. The lower density the defects, including those formed during testing, the higher the impedance. The formation of defects which has a significant impact on the adhesion and anti-corrosion properties of the coating is mainly correlated to the curing kinetics.
引用
收藏
页码：37946 / 37956
页数：11
相关论文
共 31 条
[1]   Insights into the mechanism of the chemically initiated setting of potassium silicate solutions with aluminum metaphosphates. Correlation of the structural and macroscopic parameters on the performance of the binding properties [J].
Alavi, A. Masoudi ;
Breitzke, H. ;
Hemberger, Y. ;
Sax, A. ;
Buntkowsky, G. ;
Quirmbach, P. .
CONSTRUCTION AND BUILDING MATERIALS, 2021, 277
[2]   The effect of curing time and curing temperature on the corrosion behavior of nanosilica modified potassium silicate coatings on AA2024 [J].
Bahri, H. ;
Danaee, I. ;
Rashed, G. R. .
SURFACE & COATINGS TECHNOLOGY, 2014, 254 :305-312
[3]   A NEW SOLUTION ROUTE TO SILICATES .1. KHSI2O5, H2SI2O5, AND (K,NA,H)(2)SI2O5 [J].
BENBERTAL, D ;
MOSSET, A .
JOURNAL OF SOLID STATE CHEMISTRY, 1994, 108 (02) :340-345
[4]   RAMAN SPECTROSCOPIC INVESTIGATION OF STRUCTURE OF SILICATE-GLASSES .1. BINARY ALKALI SILICATES [J].
BRAWER, SA ;
WHITE, WB .
JOURNAL OF CHEMICAL PHYSICS, 1975, 63 (06) :2421-2432
[5]   Ab initio and molecular-mechanics studies of aluminosilicate fragments, and the origin of Lowenstein's rule [J].
Catlow, CRA ;
George, AR ;
Freeman, CM .
CHEMICAL COMMUNICATIONS, 1996, (11) :1311-1312
[6]   Corrosion protection of the potassium silicate conversion coating [J].
Cheng, Lihong ;
Lou, Feipeng ;
Guo, Weihong .
VACUUM, 2020, 176 (176)
[7]   In-situ phosphatization and enhanced corrosion properties of films made of phosphate functionalized nanoparticles [J].
Chimenti, Stefano ;
Manuel Vega, Jestis ;
Garcia-Lecina, Eva ;
Grande, Hans-Juergen ;
Paulis, Maria ;
Ramon Leiza, Jose .
REACTIVE & FUNCTIONAL POLYMERS, 2019, 143
[8]  
Gettwert G, 1998, JOCCA-SURF COAT INT, V81, P596
[9]   Structure of waterborne coatings by electrochemical impedance spectroscopy and a thermostimulated current method:: influence of fillers [J].
Le Pen, C ;
Lacabanne, C ;
Pébère, N .
PROGRESS IN ORGANIC COATINGS, 2000, 39 (2-4) :167-175
[10]   A novel high solar reflective coating based on potassium silicate for track slab in high-speed railway [J].
Li, Maohong ;
Hong, Yuanxiao ;
Yu, Hong ;
Qu, Shuxin ;
Wang, Ping .
CONSTRUCTION AND BUILDING MATERIALS, 2019, 225 :900-908
1234