低表面处理环氧防腐底漆的制备及其耐蚀性研究

doi:10.11902/1005.4537.2022.390

中国腐蚀与防护学报

2023, Vol. 43

Issue (5): 1126-1132 CSTR: 32134.14.1005.4537.2022.390 DOI: 10.11902/1005.4537.2022.390

海洋材料腐蚀与防护及钢筋混凝土耐久性与设施服役安全专栏

本期目录 | 过刊浏览

低表面处理环氧防腐底漆的制备及其耐蚀性研究

陈肖寒(

), 白杨, 王志超, 陈从棕, 张勇, 崔显林, 左娟娟, 王同良

海洋化工研究院有限公司海洋涂料国家重点实验室青岛 266071

Preparation and Corrosion Resistance of Surface Tolerant Epoxy Anti-corrosion Primer

CHEN Xiaohan(

), BAI Yang, WANG Zhichao, CHEN Congzong, ZHANG Yong, CUI Xianlin, ZUO Juanjuan, WANG Tongliang

Marine Chemical Research Institute Co., Ltd., State Key Laboratory of Marine Coatings, Qingdao 266071, China

全文: PDF(7002 KB) HTML

摘要:

在Sa2等级的钢材表面制备出一种低表面处理环氧防腐底漆，其固含高达80%，实干速度只需4 h，平均附着力可达10 MPa，室外暴晒5 a涂层无任何开裂、脱落，且耐酸、碱、盐溶液腐蚀性能优异。利用Fourier红外光谱 (FTIR)、电化学阻抗谱技术 (EIS) 和三维视频显微镜对涂层的电化学性能和耐蚀机理进行了研究，结果表明，经过2400 h海水浸泡，涂层阻抗可达10¹⁰ Ω·cm²，耐海水腐蚀性能优异，阻抗值随浸泡时间的延长先减小后增大。环氧树脂和聚酰胺固化交联形成的致密涂层对腐蚀介质起到了很好的屏蔽作用，中后期磷酸锌颜料与钢材表面铁锈反应生成的稳定络合物阻止了腐蚀介质的渗入，是其耐腐蚀和实现低表面处理的关键。

关键词 ：环氧防腐底漆, 低表面处理, 电化学阻抗, 耐蚀性

Abstract：

A surface-tolerant epoxy anticorrosive primer was prepared on the surface of Sa2 grade steel. Its solid content was up to 80%, the drying speed was only 4 h, and the average adhesion was up to 10 MPa. The coating keeps intact with no cracking and no spallation after outdoor exposure for 5 a, and has excellent corrosion resistance to acid, alkali and salt solution. The electrochemical performance and corrosion mechanism of the coating were studied by means of FTIR, EIS and three-dimensional video microscope. The results showed that the impedance of the coating reached 10¹⁰ Ω·cm² after 2400 h seawater immersion, which showed excellent corrosion resistance. The impedance of the coating decreased first and then increased with the extension of immersion time. The densification of the coating is due to the cross-linking of epoxy resin and polyamide curing, so that can act as a good barrier to the corrosive medium. During the middle and late stage of the corrosion process, the stable complex formed by the reaction of zinc phosphate pigment with the rust on steel surface, can prevent the infiltration of corrosive medium, which may be the reason why the coating has excellent corrosion resistance and high tolerance to the substrate surface.

Key words： epoxy anticorrosive primer low surface treatment electrochemical impedance corrosion resistance

收稿日期: 2022-12-07 32134.14.1005.4537.2022.390

ZTFLH:

TG174

基金资助:山东省博士后创新项目和青岛市博士后应用研究项目

通讯作者: 陈肖寒，E-mail: 2906612880@qq.com，研究方向为防腐涂层及功能涂层技术研究

Corresponding author: CHEN Xiaohan, E-mail: 2906612880@qq.com

作者简介: 陈肖寒，男，1998年生，硕士生，助理工程师

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引用本文:

陈肖寒, 白杨, 王志超, 陈从棕, 张勇, 崔显林, 左娟娟, 王同良. 低表面处理环氧防腐底漆的制备及其耐蚀性研究[J]. 中国腐蚀与防护学报, 2023, 43(5): 1126-1132.
CHEN Xiaohan, BAI Yang, WANG Zhichao, CHEN Congzong, ZHANG Yong, CUI Xianlin, ZUO Juanjuan, WANG Tongliang. Preparation and Corrosion Resistance of Surface Tolerant Epoxy Anti-corrosion Primer. Journal of Chinese Society for Corrosion and protection, 2023, 43(5): 1126-1132.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2022.390 或 https://www.jcscp.org/CN/Y2023/V43/I5/1126

图1 不同环境条件下试样涂层宏观形貌图

图2 涂层经2400 h海水浸泡的EIS图

图3 涂层浸泡初期及中后期等效电路模型图

图4 C-1涂层及A、B组分的FTIR图谱

图5 2400 h海水浸泡前后C-1涂层表面形貌

图6 C-1涂层防腐机理示意图

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