<strong>PEDOT</strong>：<strong>PSS</strong>改性锌粉对冷涂锌涂层防护性能的影响

doi:10.11901/1005.3093.2019.205

材料研究学报

2019, Vol. 33

Issue (10): 776-784 DOI: 10.11901/1005.3093.2019.205

研究论文

本期目录 | 过刊浏览

PEDOT：PSS改性锌粉对冷涂锌涂层防护性能的影响

徐龙^1,²,刘福春^1,^2,³(

),韩恩厚^1,^2,³

1. 中国科学院金属研究所核用材料与安全评价重点实验室沈阳 110016
2. 中国科学技术大学材料科学与工程学院合肥 230026
3. 沈阳中科腐蚀控制工程技术中心沈阳 110016

Effect of PSS-PEDOT Surface-modified Zn Particles on Anticorrosion Performance of Acrylic Resin Coating

XU Long^1,²,LIU Fuchun^1,^2,³(

),HAN En-Hou^1,^2,³

1. Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. School of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China
3. Shenyang Zhongke Engineering Technology Center for Corrosion Control, Shenyang 110016, China

引用本文:

徐龙,刘福春,韩恩厚. PEDOT：PSS改性锌粉对冷涂锌涂层防护性能的影响[J]. 材料研究学报, 2019, 33(10): 776-784.
Long XU, Fuchun LIU, En-Hou HAN. Effect of PSS-PEDOT Surface-modified Zn Particles on Anticorrosion Performance of Acrylic Resin Coating[J]. Chinese Journal of Materials Research, 2019, 33(10): 776-784.

全文: PDF(6410 KB) HTML

摘要:

采用聚3，4-乙烯二氧噻吩：聚苯乙烯磺酸(PEDOT：PSS)对锌粉进行表面改性，在3.5%(质量分数)NaCl溶液中的浸泡试验和扫描电子显微镜分析结果显示改性后锌粉腐蚀减弱，扫描振动电极技术测试(SVET)结果显示腐蚀电流密度下降一个数量级，锌粉的耐蚀性得到提高。通过盐雾试验和电化学阻抗谱测试表征了锌粉改性对涂层防护性能的影响，发现改性后涂层表层锌粉消耗降低，腐蚀产物减少，且涂层的阴极保护作用时间延长20%。PEDOT：PSS提高了涂层表层中锌粉的耐蚀性和强化了涂层内部阴极保护作用。

关键词 ：材料失效与保护, 冷涂锌涂层, 电化学阻抗谱, 表面改性, 导电聚合物

Abstract：

Zn particles were surface modified with polystyrene sodium sulfonate doped poly3, 4-ethylene dioxythiophene (PSS-PEDOT). The corrosion performance of the as modified Zn powder was investigated by means of immersion test in 3.5%NaCl (mass fraction) solution and scanning electron microscope, of which the corrosion current density was found one order of magnitude smaller than that of the blank Zn powder. Then, the anticorrosion performance of the coating composed of acrylic resin incorporated with the modified Zn powder was characterized by means of salt spray test and electrochemical impedance spectroscope. It follows that less corrosion of Zn particles on the coating surface was observed and the cathodic protection duration of the coating was prolonged by 20% in contrast with the one incorporated with blank Zn powder. The increased corrosion resistance of Zn particles and enhanced electrical connections that decreased the Zn reactivity was proposed as the possible mechanism of the improved anticorrosion performance of the coating incorporated with modified Zn powder.

Key words： material failure and protection cold galvanizing coating EIS surface modification conductive polymer

收稿日期: 2019-04-20

ZTFLH:

TQ630

基金资助:沈阳市科技计划(Y17-1-039)

作者简介: 徐龙，男，1992年生，博士

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https://www.cjmr.org/CN/10.11901/1005.3093.2019.205 或 https://www.cjmr.org/CN/Y2019/V33/I10/776

图1 锌粉后锌粉形貌SEM图和EDS分析

图2 不同锌粉浸泡在3.5% NaCl溶液中5 d后光学照片和SEM照片

图3 未改性和改性锌粉涂层试样在3.5% NaCl 溶液浸泡0.5 h后SVET测试结果

图 4 盐雾试验2000 h后涂层样板表面状态以及涂层表面及截面处SEM观察

图5 涂层试样在3.5%NaCl溶液中腐蚀电位随浸泡时间的变化

图6 未改性和改性涂层试样在3.5% NaCl溶液中不同浸泡时间的Nyquist图和Bode图

图7 拟合所用的等效电路

图8 电化学阻抗谱拟合参数随浸泡时间的变化

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