左洋,魏晗,左禹,张寒露,唐聿明,赵旭辉.石墨烯改性增强富镁涂层对AZ91D镁合金的腐蚀防护效果[J].表面技术,2021,50(1):395-404.
ZUO Yang,WEI Han,ZUO Yu,ZHANG Han-lu,TANG Yu-ming,ZHAO Xu-hui.Corrosion Protection of Graphene Particles Modified Mg-rich Coating on AZ91D Magnesium Alloy[J].Surface Technology,2021,50(1):395-404 |
| 石墨烯改性增强富镁涂层对AZ91D镁合金的腐蚀防护效果 |
| Corrosion Protection of Graphene Particles Modified Mg-rich Coating on AZ91D Magnesium Alloy |
| 投稿时间：2020-06-07 修订日期：2020-08-03 |
| DOI：10.16490/j.cnki.issn.1001-3660.2021.01.036 |
| 中文关键词: 石墨烯 富镁涂层 AZ91D镁合金 电化学交流阻抗 阴极保护 |
| 英文关键词:graphene Mg-rich coating AZ91D magnesium alloy EIS cathode protection |
| 基金项目: |
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| Author | Institution |
| ZUO Yang | Key Laboratory of Carbon Fiber and Functional Polymer, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China |
| WEI Han | 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 |
| ZHANG Han-lu | No.92228 PLA, Beijing 100072, 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 |
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| 中文摘要: |
| 目的 在保证环氧富镁涂层阴极保护作用的同时，降低涂层中的镁粉含量，进一步提高环氧富镁涂层对镁合金基体的保护效果。方法 将不同含量的石墨烯(1%、2%、4%)加入环氧富镁涂层中替代等质量的镁粉来制备改性富镁涂层，利用Machu测试、电化学交流阻抗测试、扫描电子显微镜观察等方法，对改性富镁涂层的防护性能进行研究。结果 石墨烯添加量过多(4%)时，涂层的耐蚀性降低;添加量较少(1%和2%)时，涂层的孔隙率降低，附着力升高，涂层的屏蔽效果得到提高，开路电位测得的阴极保护作用时间也有一定程度的延长，其中石墨烯添加量为2%、镁粉含量为48%时，涂层的阴极保护时间为145 h，改善作用最明显。结论 适量石墨烯加入环氧富镁涂层中增强了镁颗粒与基体之间的电连接，有效提高了涂层中镁粉的利用率，降低了镁合金的腐蚀速度，并且没有改变富镁涂层中镁粉的作用机制。同时，由于石墨烯片层状结构和较小的粒径，填充了涂层中的孔隙，并且在涂层中形成迷宫结构，有效延长了电解质的扩散通道，使涂层屏蔽性能得到提高。 |
| 英文摘要: |
| The work aims to further improve the protection performance of Mg-rich coating on magnesium alloy on the condition of ensuring the cathodic protection and decreasing content of the magnesium powder. Firstly, graphene modified Mg-rich coating were prepared by adding different mass fractions of graphene (1wt%, 2wt% and 4wt%) to Mg-rich coating to replace part of the magnesium powders. Then, the protection performance of different graphene modified Mg-rich coatings was studied by Machu test, electrochemical impedance measurement (EIS), open circuit potential (OCP) and scanning electron microscopy (SEM). The results show that the addition of excessive graphene (4wt%) to the Mg-rich coating results in a significant deterioration of the protective effect of the coating. However, addition of a small amount of graphene (1wt% and 2wt%) to the epoxy magnesium-based coatings can significantly improve the compactness of the coating and the adhesion force between coating and Mg alloy. Among them, the protective performance of the coating with the 2wt% graphene and 48wt% Mg powder is the best and the OCP result shows that the cathode protection period of the graphene modified Mg-rich coating is extended to 145 h. Thus, the protective effect of the Mg-rich coating on AZ91D magnesium alloy is significantly improved. The addition of graphene to the Mg-rich coating can effectively enhance the electrical contact between the metals, which is beneficial to improve the effective utilization of the pure Mg particles and reduce the corrosion rate of AZ91D substrate, and meanwhile does not change the protection mechanisms of the Mg-rich coating on AZ91D magnesium alloy. In addition, because of the unique two-dimensional (2D) structure and small size, graphene could prolong the penetration path of the aggressive solution and block the defect pores of the Mg-rich coating firmly, which improves the barrier property of the coating. |
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