| 姜洁,许甜,刘婧,杨超,崔淦.交流干扰下碱性环境中富锌环氧涂层失效机制研究[J].装备环境工程,2021,18(7):99-106. JIANG Jie,XU Tian,LIU Jing,YANG Chao,CUI Gan.Effect of AC Interference on Failure Mechanism of Zinc-rich Epoxy Coatings in Different Environments[J].Equipment Environmental Engineering,2021,18(7):99-106. |
| 交流干扰下碱性环境中富锌环氧涂层失效机制研究 |
| Effect of AC Interference on Failure Mechanism of Zinc-rich Epoxy Coatings in Different Environments |
| 投稿时间：2021-02-03 修订日期：2021-03-04 |
| DOI：10.7643/issn.1672-9242.2021.07.015 |
| 中文关键词: 交流干扰 环氧富锌涂层 电化学阻抗 锌粉活化 阴极保护 |
| 英文关键词:AC interference zinc-rich epoxy coating EIS zinc powder activation cathodic protection |
| 基金项目: |
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| Author | Institution |
| JIANG Jie | CNPC EastChina Design Institute Co., Ltd, Qingdao 266071, China |
| XU Tian | CNPC EastChina Design Institute Co., Ltd, Qingdao 266071, China |
| LIU Jing | CNPC EastChina Design Institute Co., Ltd, Qingdao 266071, China |
| YANG Chao | Postdoctoral Scientific Research Workstation of Shengli Oilfield Company, Dongying 257000, China;Technology Inspection Center of Shengli Oilfield, SINOPEC, Dongying 257000, China |
| CUI Gan | China University of Petroleum East China, Qingdao 265800, China |
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| 中文摘要: |
| 目的 揭示碱性环境下交流干扰对富锌环氧涂层失效机制的影响。方法 以富锌环氧涂层为研究对象，以X80钢为基体，手工涂敷形成带涂层的X80钢样品，通过五点测试法确定涂层厚度为(25±5) μm，施加交流干扰电压。通过电化学测试，研究涂层样品在3%(质量分数)NaOH溶液中随浸泡时间的电化学阻抗变化特征，揭示交流电对富锌环氧涂层的作用机制。结果 在碱性环境下，锌粉更有利于活化，但是反应速率也更快，导致活化的锌粉表面能够迅速形成腐蚀产物Zn(OH)2和Zn(OH)42–，阻止锌粉之间的电连接，同时基体Fe在碱性环境中容易发生钝化，极大地减弱了涂层与金属基体的湿结合力。当交流干扰存在时，活化锌粉的反应过程非常迅速，以至于不能形成有效的电连接和阴极保护。结论 交流干扰能够抑制锌颗粒的活化过程(ZnO→Zn(OH)2/Zn(OH)42–)，促进活化锌颗粒的反应过程，削弱锌的阴极保护作用。 |
| 英文摘要: |
| This paper aims to reveal the failure mechanism of Zn-rich epoxy coating under the condition of high hydroxyl ion concentration and AC interference. Zn-rich epoxy coating was selected as the research object. X80 steel was used as matrix, the coated X80 sample was formed manually and the coating thickness was determined to be (25±5) μm by five-point test. The EIS of the coated X80 sample in 3 wt.% NaOH solution with immersion time was studied with / without AC interference, and the failure evolution mechanism of Zn-rich epoxy coating was established. In alkaline environment, zinc powder was more advantageous to the activation, but also had faster reaction rate, which contributed to Zn(OH)2 and Zn(OH)42－quickly covered the activated zinc power to prevent electrical connection. Meanwhile, Fe in alkaline environments was prone to passivation, greatly weakened the wet adhesion strength of coating and metal matrix. Similarly, the reaction process of activated zinc powder was very rapid due to AC voltage, so that effective electrical connection and cathodic protection cannot be formed. AC interference can inhibit the activation process of zinc particles (ZnO→Zn(OH)2/Zn(OH)42–), promote the reaction process of activating zinc particles, leading to a weaker cathodic protection of zinc. |
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