硅酸锌-硅酸钾水性防腐涂料的制备与性能表征

单庆婷, 许荣盛, 章苗苗, 林 键

doi:10.16577/j.issn.1001-1560.2023.0196

材料保护 >

2023 , Vol. 56 >Issue 8: 124 - 132

DOI: https://doi.org/10.16577/j.issn.1001-1560.2023.0196

工艺探讨

硅酸锌-硅酸钾水性防腐涂料的制备与性能表征

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安徽建筑大学a.土木工程学院，b.建筑结构与地下工程安徽省重点实验室，安徽合肥 230601

许荣盛(1988-)，博士，主要研究方向为建筑涂层，E-mail: rongshengxu＠ahjzu.edu.cn

收稿日期: 2023-02-17

修回日期: 2023-03-14

录用日期: 2023-04-15

网络出版日期: 2023-08-25

基金资助

国家自然科学基金项目(52172027)；安徽建筑大学博士启动基金(2020QDZ25)资助

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Preparation and Performance Characterization of Zinc Silicate-Potassium Silicate Waterborne Anticorrosive Paint

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a.College of Civil Engineering，b.Anhui Province Key Laboratory of Building Structure and Underground Engineering，Anhui Jianzhu University，Hefei 230601，China

Received date: 2023-02-17

Revised date: 2023-03-14

Accepted date: 2023-04-15

Online published: 2023-08-25

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摘要

针对蒸压加气混凝土(AAC)板材中钢筋常用的有机溶剂型防腐涂料存在挥发性有机物(VOC)、易老化等问题，采用改性高模数硅酸钾溶液、硅酸锌粉末和助剂制备水性无机硅酸盐防腐涂料，研究了硅酸锌掺量对涂料施工性能、附着力和粘结强度的影响，对涂料的化学组成、物相构成、微观形貌进行了表征，并对涂料的防腐性能进行分析。结果表明:随着硅酸锌掺量的增加，涂料粘结强度下降，附着力先增大后减小，当硅酸锌掺量为50%(质量分数)时，因成膜物质与颜填料比例适中，制备的涂层物理力学性能和防腐性能较优，附着力、粘结强度分别为3.90 MPa 和1.80 MPa，且浸泡7 d 后，开位电路、极化电阻分别为-221 mV、39 470 Ω·cm²，平整光滑的漆膜、基材表面的钝化膜和AAC 与涂料界面处相对致密的水合硅酸钙为基材提供了良好的物理屏蔽。

关键词： 蒸压加气混凝土; 硅酸锌; 硅酸钾; 水性硅酸盐涂料; 防腐性能

本文引用格式

单庆婷, 许荣盛, 章苗苗, 林键 . 硅酸锌-硅酸钾水性防腐涂料的制备与性能表征[J]. 材料保护, 2023 , 56(8) : 124 -132 . DOI: 10.16577/j.issn.1001-1560.2023.0196

Abstract

In order to solve the problems of volatile organic compounds (VOC) and easy aging of organic solvent based anti-corrosion coatings commonly used for reinforcing steel bars in autoclaved aerated concrete (AAC) plates，waterborne inorganic silicate anti-corrosion coatings were prepared by using modified high-modulus potassium silicate solution，zinc silicate powder and additives.The influence of zinc silicate content on the workability，adhesion and bonding strength of the coating was studied.The chemical composition，phase composition，and microstructure of the coating were characterized，and the anti-corrosion performance of the coating was analyzed.Results showed that the bonding strength of the paint gradually decreased with the increase of the zinc silicate content.And the adhesive strength increased first and then decreased as increasing the content of zinc silicate.When the content of zinc silicate was 50% (mass fraction)，the paint exhibited superior physical，mechanical and anti-corrosion properties due to the suitable ratio of film-forming material to pigment and filler.The adhesion and bonding strength were 3.9 MPa and 1.8 MPa，respectively.Moreover，after immersion in the solution with 3.5%NaCl for 7 d，the open circuit and polarization resistance of the paint were -221 mV，39 470 Ω·cm²，respectively.The flat and smooth paint，the passivation film on the surface of the substrate，and the relatively dense hydrated calcium silicate at the interface between AAC and the coating provided a good physical shielding for the substrate.

Key words： autoclaved aerated concrete; zinc silicate; potassium silicate; waterborne silicate paint; corrosion resistance

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