| 摘要: |
| 带锈涂装涂料在海洋船舶和电力设备领域有着迫切应用需求，而溶剂型带锈涂料难满足绿色环保的要求，水性带锈耐蚀涂料的开发迫在眉睫。通过片状锌粉和植酸的协同作用成功研制一种应用于带锈钢基材表面的环保型水性植酸富锌涂层， 采用附着力拉开法、中性盐雾试验、电化学测试检测附着力与耐蚀性能，利用傅里叶红外光谱仪(FTIR)、扫描电子显微镜 (SEM)、X 射线光电子能谱(XPS)对腐蚀后涂层表面锈层进行分析，并讨论涂层的防锈转锈机理。结果显示：环氧乳液和固化剂配比为 4∶1，片状锌粉含量为 40%，以植酸为转锈剂时，该涂层对带锈钢基材表现出突出的附着力(11.8 MPa)及优异的耐蚀性能。该涂层优势在于：片状锌粉致密堆积延长了腐蚀粒子入侵通道，为基材提供物理屏蔽效果；片状锌粉和钢基材形成若干微电池区，为基材提供牺牲阳极的阴极保护作用；植酸与铁锈形成稳固的植酸铁螯合物，转化锈层进一步保护基材。 |
| 关键词: 水性涂料 带锈涂装 片状锌粉 植酸 转锈剂 |
| DOI：10.11933/j.issn.1007?9289.20220126001 |
| 分类号:TQ630 |
| 基金项目:国家自然科学基金(51805377)和武汉市企业技术创新(2020010602012060)资助项目 |
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| Preparation and Corrosion Resistance of Waterborne Phytic Acid Zinc-rich Coating Painted with Rust |
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JIN Yijie, ZHAN Shengpeng, JIA Dan, ZHANG Wulin, YANG Tian, MA Lixin, DUAN Haitao
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State Key Laboratory of Special Surface Protection Materials and Application Technology,Wuhan Institute of Material Protection, Wuhan 430030 , China
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| Abstract: |
| There is an urgent need for rust-bearing coatings in the fields of marine ships and power equipment, and solvent-based rust-bearing coatings are difficult to achieve the requirements of green environmental protection. The research and development of water-based rust-resistant coatings is imminent. Through the synergistic effect of flake zinc powder and phytic acid, an environmentally friendly water-based phytic acid zinc-rich coating apply to the surface of rusted steel substrates is successfully developed. Adhesion and corrosion resistance are detected by adhesion pull-off method, neutral salt spray test and electrochemical test, Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS) are used to analyze the rust layer on the surface of the corrosion-resistant coating, and the mechanism of the coating’ s rust-proof and rust-shifting is discussed. The results show that when the ratio of epoxy emulsion and curing agent is 4∶1, the content of flaky zinc powder is 40%, and the rust-transferring agent is phytic acid, the coating exhibits outstanding adhesion to the rusted steel substrate (11.8 MPa) and excellent corrosion resistance. The advantages of this coating are that 1) the dense packing of flaky zinc powder extends the intrusion channel of corrosion particles and provides a physical shielding effect for the substrate; 2) flaky zinc powder and steel substrate Several micro-battery areas are formed to provide cathodic protection of sacrificial anodes for the substrate; 3) phytic acid and rust form a stable iron phytate chelate, transforming the rust layer to further protect the substrate. |
| Key words: water-based coating painted with rust flake zinc powder phytic acid rust conversion agent |
