| 张寒露,曹京宜,魏晗,陈雪萍,邢超,唐聿明,赵旭辉,左禹.环氧富锌-石墨烯涂层在中性盐雾和高低温循环浸泡中的失效研究[J].装备环境工程,2021,18(11):1-9. ZHANG Han-lu,CAO Jing-yi,WEI Han,CHEN Xue-ping,XING Chao,TANG Yu-ming,ZHAO Xu-hui,ZUO Yu.Failure Behavior of Graphene Modified Zinc-Rich Epoxy Coating in Neutral Salt Spray and Cyclic Temperature Immersion Tests[J].Equipment Environmental Engineering,2021,18(11):1-9. |
| 环氧富锌-石墨烯涂层在中性盐雾和高低温循环浸泡中的失效研究 |
| Failure Behavior of Graphene Modified Zinc-Rich Epoxy Coating in Neutral Salt Spray and Cyclic Temperature Immersion Tests |
| 投稿时间：2021-08-29 修订日期：2021-10-19 |
| DOI：10.7643/issn.1672-9242.2021.11.001 |
| 中文关键词: 环氧富锌涂层 石墨烯 20#钢 EIS 失效中图分类号:TG174.4 文献标识码:A 文章编号:1672-9242(2021)11-0001-09 |
| 英文关键词:zinc-rich epoxy coating graphene 20# steel EIS failure behavior |
| 基金项目: |
|
|
| Author | Institution |
| ZHANG Han-lu | No.92228 PLA, Beijing 100072, China |
| CAO Jing-yi | No.92228 PLA, Beijing 100072, China |
| WEI Han | Key Laboratory of Carbon Fiber and Functional Polymer, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China |
| CHEN Xue-ping | Key Laboratory of Carbon Fiber and Functional Polymer, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China |
| XING Chao | Key Laboratory of Carbon Fiber and Functional Polymer, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China |
| TANG Yu-ming | Key Laboratory of Carbon Fiber and Functional Polymer, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China |
| ZHAO Xu-hui | Key Laboratory of Carbon Fiber and Functional Polymer, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China |
| ZUO Yu | Key Laboratory of Carbon Fiber and Functional Polymer, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China |
|
| 摘要点击次数: |
| 全文下载次数: |
| 中文摘要: |
| 目的 研究20#钢表面环氧富锌-石墨烯涂层在中性盐雾和高低温循环浸泡(3.5% NaCl溶液，45 ℃12 h+RT 12 h)试验中的失效过程与行为。方法 采用电化学交流阻抗(EIS)测试、开路电位(OCP)监测、扫描电镜观察与分析(SEM/EDS)以及红外光谱(FTIR)等方法研究涂层在两种试验环境中的失效特征和对20#钢的保护作用，并探讨涂层失效的低频阻抗评价标准。结果 涂层试样分别在中性盐雾79 d和高低温循环浸泡160 d后，表面开始出现锈点，失去对基体的保护作用，此时低频阻抗(|Z|0.01 Hz)值降至7×104 Ω.cm2左右。除了屏蔽作用以外，环氧富锌-石墨烯涂层还可为钢基体提供一定的阴极保护作用，其中高低温浸泡环境中的阴极保护作用时间略长。在两种加速试验环境中，涂层后期的失光率均处于“明显失光”，色差值达到或接近“较大变色”。红外光谱显示，涂层中的特征官能团未发生明显的变化。结论 通常利用低频阻抗(|Z|0.01 Hz)低于1×106 Ω.cm2来衡量有机涂层(不含导电颗粒)失效的判据，不适用于评价碳钢表面的环氧富锌-石墨烯涂层体系，对于该体系的失效评价可能需要再降低近2个数量级，约为7×104 Ω.cm2左右。 |
| 英文摘要: |
| This paper aims to study the failure process and behavior of the epoxy zinc-rich graphene coating on the surface of 20# steel in neutral salt spray and high and low temperature cyclic immersion (3.5% NaCl solution, 45 ℃ 12 h+RT 12 h) tests. Electrochemical impedance spectroscopy (EIS), open circuit potential (OCP), scanning electron microscopy (SEM/EDS) and infrared spectroscopy (FTIR) methods were used to study the failure behavior of graphene modified zinc-rich epoxy coating and the protection of 20# steel in neutral salt spray and cyclic temperature immersion tests (3.5wt% NaCl solution, 45 ℃ 12 h + RT 12 h). And explore the low-frequency impedance evaluation standard of coating failure. The results showed that after coating samples were immersed in neutral salt spray for 79 d and high and low temperature cycles for 160 d, rust spots began to appear on the surface and lost the protective effect on the substrate. At this time, the low-frequency impedance (|Z|0.01 Hz) value dropped to 7×104 W×cm2. Except for the shielding property, the graphene modified zinc-rich epoxy coating can also provide the cathodic protection for the steel substrate, meanwhile, the cathodic protection in the high and low temperature immersion environment has a slightly longer duration of action. In the two accelerated test environments, the gloss loss rate of the coating was “significant loss of light”, the color difference reached or approached “large discoloration”, and the characteristic functional groups in the coating presented did not change significantly. Low frequency impedance (|Z|0.01 Hz) usually is lower than 1×106 W×cm2 to measure the failure criterion of organic coating (without conductive particles), which is not suitable for evaluating epoxy zinc-rich graphene on carbon steel surface for the coating system, the failure evaluation of the system may need to be reduced by about 2 orders of magnitude, which is about 7×104 Ω.cm2. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|
