Enhancement of physico-mechanical and electrochemical properties of zinc-rich epoxy coatings by optimised interfacial behaviour of reduced graphene oxide

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS Diamond and Related Materials Pub Date : 2024-11-20 DOI:10.1016/j.diamond.2024.111815

Peng Wang, Jian Wei, Enhao Lv, Zhuang Miao, Yanbin Zhang, Yuerong Li

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Abstract

High porosity and low utilization of zinc powder are two major challenges for conventional zinc-rich epoxy (ZRE) coatings. Although these two challenges can be overcome by the addition of graphene material, it also brings new challenges due to the addition of more fillers leading to degradation of mechanical properties and galvanic coupling corrosion. In this work, the effect of the interfacial behaviour of reduced graphene oxide (RGO) in coatings on the mechanical properties, shielding properties and cathodic protection properties of RGO/ZRE composite coatings has been comprehensively evaluated. In terms of mechanical properties, RGO additions of 0.3 wt%, 0.75 wt% and 1.2 wt% exhibited RGO enhancement stage, RGO interfacial compatibility influence stage and RGO agglomeration influence stage. In terms of cathodic protection performance, RGO additions of 0.3 wt%, 0.75 wt% and 1.2 wt% exhibited a zinc powder utilization enhancement stage, an accelerated zinc powder consumption stage by galvanic coupling corrosion, and a significantly reduced initial shielding stage, respectively. The RGO/ZRE composite coating has the best comprehensive performance at 0.3 wt% RGO addition, and the composite coating did not crack or peel off in impact and bending tests, the coefficient of friction was 0.64465, the width of abrasion mark was 1.18 mm, and the coating adhesion was 5.81 MPa. The 0.3 wt%-RGO/ZRE composite coating has insignificant galvanic coupling corrosion and has a cathodic protection time of 720 h, and significantly higher low-frequency impedance modulus than the ZRE coatings. The shielding, mechanical, and cathodic protection properties of ZRE coatings can be significantly improved with appropriate RGO additions, and the galvanic coupling corrosion and agglomeration induced by the high RGO content are the key factors limiting the application of RGO in the coatings.

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通过优化还原氧化石墨烯的界面行为增强富锌环氧涂层的物理机械和电化学性能

孔隙率高和锌粉利用率低是传统富锌环氧（ZRE）涂料面临的两大挑战。虽然通过添加石墨烯材料可以克服这两大难题，但由于添加了更多填料，导致机械性能下降和电偶腐蚀，这也带来了新的挑战。在这项工作中，我们全面评估了还原氧化石墨烯（RGO）在涂层中的界面行为对 RGO/ZRE 复合涂层的机械性能、屏蔽性能和阴极保护性能的影响。在机械性能方面，0.3 wt%、0.75 wt% 和 1.2 wt% 的 RGO 添加量分别表现出 RGO 增强阶段、RGO 界面相容性影响阶段和 RGO 凝聚影响阶段。在阴极保护性能方面，添加量为 0.3 wt%、0.75 wt% 和 1.2 wt% 的 RGO 分别表现出锌粉利用率提高阶段、电偶腐蚀加速锌粉消耗阶段和初始屏蔽阶段的显著降低。RGO/ZRE 复合涂层在 RGO 添加量为 0.3 wt% 时综合性能最好，复合涂层在冲击和弯曲试验中没有开裂或脱落，摩擦系数为 0.64465，磨痕宽度为 1.18 mm，涂层附着力为 5.81 MPa。0.3 wt%-RGO/ZRE 复合涂层的电偶腐蚀不明显，阴极保护时间为 720 h，低频阻抗模量明显高于 ZRE 涂层。适当添加 RGO 可以显著提高 ZRE 涂层的屏蔽、机械和阴极保护性能，而高 RGO 含量引起的电偶腐蚀和团聚是限制 RGO 在涂层中应用的关键因素。

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来源期刊

Diamond and Related Materials 工程技术-材料科学：综合

CiteScore

6.00

自引率

14.60%

发文量

702

审稿时长

2.1 months

期刊介绍： DRM is a leading international journal that publishes new fundamental and applied research on all forms of diamond, the integration of diamond with other advanced materials and development of technologies exploiting diamond. The synthesis, characterization and processing of single crystal diamond, polycrystalline films, nanodiamond powders and heterostructures with other advanced materials are encouraged topics for technical and review articles. In addition to diamond, the journal publishes manuscripts on the synthesis, characterization and application of other related materials including diamond-like carbons, carbon nanotubes, graphene, and boron and carbon nitrides. Articles are sought on the chemical functionalization of diamond and related materials as well as their use in electrochemistry, energy storage and conversion, chemical and biological sensing, imaging, thermal management, photonic and quantum applications, electron emission and electronic devices. The International Conference on Diamond and Carbon Materials has evolved into the largest and most well attended forum in the field of diamond, providing a forum to showcase the latest results in the science and technology of diamond and other carbon materials such as carbon nanotubes, graphene, and diamond-like carbon. Run annually in association with Diamond and Related Materials the conference provides junior and established researchers the opportunity to exchange the latest results ranging from fundamental physical and chemical concepts to applied research focusing on the next generation carbon-based devices.