植酸转化膜对环氧清漆防腐性能的影响

doi:10.11902/1005.4537.2017.052

中国腐蚀与防护学报

2018, Vol. 38

Issue (3): 265-273 DOI: 10.11902/1005.4537.2017.052

研究报告

本期目录 | 过刊浏览

植酸转化膜对环氧清漆防腐性能的影响

常亮, 师超, 邵亚薇(

), 王艳秋, 刘斌, 孟国哲

哈尔滨工程大学材料科学与化学工程学院腐蚀与防护实验室哈尔滨 150001

Effect of Phytic Acid Conversion Film on Corrosion Resistance of Epoxy Varnish Coating

Liang CHANG, Chao SHI, Yawei SHAO(

), Yanqiu WANG, Bin LIU, Guozhe MENG

Corrosion and Protection Laboratory, College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China

全文: PDF(5508 KB) HTML

摘要:

利用电化学阻抗谱 (EIS)、扫描电镜 (SEM)、Fourier红外光谱 (FT-IR)、附着力测试等技术,研究了植酸转化液作为前处理技术对环氧带锈涂装涂料防腐性能的影响。结果表明,植酸转化液使锈层与基体附着牢固,对带锈涂装涂料的附着力、防腐蚀性能均有提高,所形成的植酸转化膜由内部致密层和外部较疏松的植酸铁两部分构成,且表面富含PO₄^3-和OH^-等官能团,利于植酸转化膜与环氧涂层形成牢固的附着,从而提高带锈涂装涂料的附着力和防腐蚀性能。

关键词 ：植酸转化液, 带锈涂装, 环氧涂层, 防腐蚀性能

Abstract：

Effect of pretreatment of rust Q235 carbon steel with phytic acid solution on the corrosion resistance of epoxy coating was studied by means of electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and adhesion test. The results showed that this pretreatment process could enhanced the adhesion of the rust scale to the matrix, thereby enhance the adhesive strength and corrosion protectiveness on property of the epoxy coating obviously. Which might be attributed to that the phytic acid conversion film consisted of a dense inner layer and a loose outer layer rich in PO₄^3- and OH^- functional groups. This could improve the adhesion between the phytic acid conversion film and epoxy coating, therewith enhance the adhesion and corrosion protectiveness of the entired composite coating.

Key words： phytic acid conversion solution rusty paint epoxy coating corrosion protection

收稿日期: 2017-04-11

ZTFLH:

TG174.46

基金资助:国家重点研发计划 (2016YFB0300604) 和中央高校基本科研业务费专项资金 (HEUCFZ1502)

作者简介:

作者简介常亮,男,1992年生,硕士生

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引用本文:

常亮, 师超, 邵亚薇, 王艳秋, 刘斌, 孟国哲. 植酸转化膜对环氧清漆防腐性能的影响[J]. 中国腐蚀与防护学报, 2018, 38(3): 265-273.
Liang CHANG, Chao SHI, Yawei SHAO, Yanqiu WANG, Bin LIU, Guozhe MENG. Effect of Phytic Acid Conversion Film on Corrosion Resistance of Epoxy Varnish Coating. Journal of Chinese Society for Corrosion and protection, 2018, 38(3): 265-273.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2017.052 或 https://www.jcscp.org/CN/Y2018/V38/I3/265

图1 喷砂与带锈基体上环氧清漆涂层的附着力随浸泡时间变化图

图2 不同涂层的附着力随浸泡时间的变化图

图3 带锈基体上EP和PA/EP涂层的EIS谱随时间的变化曲线

图4 涂层的低频阻抗模值随浸泡时间的变化

图5 等效电路图

图6 涂层电荷转移电阻随浸泡时间的变化

图7 涂层腐蚀电位随浸泡时间的变化

图8 不同涂层经3.5%NaCl溶液浸泡9000 h后去除涂层前后Q235钢表面的腐蚀宏观形貌

图9 涂覆涂层的带锈Q235钢经3.5%NaCl溶液浸泡9000 h后的表面腐蚀形貌

图10 锈层及植酸转化膜FT-IR谱

图11 锈层及植酸转化膜截面SEM像

图12 涂层截面的SEM像

图13 植酸转化膜截面的SEM像以及相应的EDS线扫描元素分布图

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