多羟基超分散剂对水性环氧涂层防腐性能的影响

doi:10.11902/1005.4537.2022.292

中国腐蚀与防护学报

2023, Vol. 43

Issue (2): 289-300 CSTR: 32134.14.1005.4537.2022.292 DOI: 10.11902/1005.4537.2022.292

中国腐蚀与防护学报编委、青年编委专栏

本期目录 | 过刊浏览

多羟基超分散剂对水性环氧涂层防腐性能的影响

袁世成¹^,², 吴艳峰³, 徐长慧², 王兴奇², 冷哲¹(

), 杨延格²(

)

^1.浙江海洋大学海洋工程装备学院舟山 316002
^2.中国科学院金属研究所师昌绪先进材料创新中心沈阳 110016
^3.海装装备项目管理中心北京 100071

Influence of Polyhydroxy Hyperdispersant on Anti-corrosion Property of Waterborne Epoxy Coatings

YUAN Shicheng¹^,², WU Yanfeng³, XU Changhui², WANG Xingqi², LENG Zhe¹(

), YANG Yange²(

)

^1.School of Marine Engineering Equipment, Zhejiang Ocean University, Zhoushan 316022, China
^2.Shi -changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^3.Equipment Project Management Center of Naval Equipment Department, Beijing 100071, China

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摘要:

通过开路电位测量、电化学阻抗谱测试、动电位极化曲线测试、附着力测试等手段，研究了多羟基超分散剂对水性环氧清漆防腐性能的影响。结果表明，在3.5%NaCl溶液中，环氧清漆和含分散剂的环氧清漆的失效历程相同，可分为4个阶段：涂层快速吸水阶段、涂层腐蚀产物生成阶段、稳定腐蚀阶段和腐蚀产物扩散阶段。含分散剂的环氧清漆表现为较强的吸水性，多羟基超分散剂增加了涂层的饱和吸水率，加快了涂层的腐蚀失效。

关键词 ：分散剂, 水性环氧, 吸水率, 腐蚀, 电化学阻抗谱

Abstract：

The effect of polyhydroxy hyperdispersants on the anti-corrosion property of waterborne epoxy varnishes were studied by means of open circuit potential, electrochemical impedance spectroscopy, polarization curves measurements and adhesion test. The results show that the addition of polyhydroxy dispersant into the epoxy varnish may accelerate the water absorption rate of the coating, while the increased water absorption can result in the preferential failure of the epoxy varnish. The corrosion failure process of epoxy varnish and epoxy varnish with 2% dispersant in 3.5%NaCl solution is the same, which can be divided into four stages: rapid water absorption of coating, the formation of corrosion products at the coating/metal interface, the accumulation of corrosion products and the diffusion of corrosion products.

Key words： dispersant waterborne epoxy water absorption corrosion electrochemical impedance spectroscopy

收稿日期: 2022-09-21 32134.14.1005.4537.2022.292

ZTFLH:

TQ630.4+9

基金资助:工信部民机专项(MJ-2017-J-99);浙江省省属高校基本科研业务费(2021JZ006)

作者简介: 袁世成，男，1997年生，硕士生

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引用本文:

袁世成, 吴艳峰, 徐长慧, 王兴奇, 冷哲, 杨延格. 多羟基超分散剂对水性环氧涂层防腐性能的影响[J]. 中国腐蚀与防护学报, 2023, 43(2): 289-300.
Shicheng YUAN, Yanfeng WU, Changhui XU, Xingqi WANG, Zhe LENG, Yange YANG. Influence of Polyhydroxy Hyperdispersant on Anti-corrosion Property of Waterborne Epoxy Coatings. Journal of Chinese Society for Corrosion and protection, 2023, 43(2): 289-300.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2022.292 或 https://www.jcscp.org/CN/Y2023/V43/I2/289

表1 实验所用环氧清漆涂层的成分配比表

图1 两种涂层开路电位随浸泡时间的变化曲线

图2 两种涂层低频阻抗模值随浸泡时间的变化

图3 EV涂层4个阶段的Nyquist图和Bode图

图4 EVD涂层失效过程中4个阶段的Nyquist图和Bode图

图5 用于拟合两种涂层阻抗谱数据的等效电路模型

图6 EV涂层和EVD涂层的电化学拟合参数随时间的变化

图7 水在两种涂层中扩散的线性拟合结果

Coating	Period / h	A	B / t· $s - 12$	R	D / 10^-10 cm²·s^-1
EV	0-96	-9.4935	1.67×10^-4	0.96504	1.06253
EVD	0-48	-9.6617	1.03×10^-3	0.99009	1.34064
EVD	48-384	-9.3163	1.81×10^-4	0.98373	0.28778

表2 线性拟合参数和计算结果

图8 两种涂层浸泡不同时间后的动电位极化曲线

表3 两种涂层浸泡在3.5%NaCl溶液中不同时间的电化学参数

图9 两种涂层湿态附着力随浸泡时间的变化

图10 EV和EVD附着力测试后的金属基体形貌

图11 两种涂层不同断裂形式的百分比

图12 EV和EVD涂层浸泡不同时间后的显微形貌

图13 EV和EVD涂层浸泡不同时间的腐蚀区域百分比

图14 EVD涂层固化过程

图15 EVD涂层的失效过程

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