A densely structured three-dimensional geopolymer network could effectively impede the migration and diffusion of chloride ion. This study developed one kind of efficient and cost-effective and multi-component geopolymer coating (MGC) for inhibiting and delaying the corrosion of steel. The influence of alkali content, metakaolin replacement ratio, polyvinyl alcohol content, and titanium dioxide content on the fluidity, setting time, and rheological properties of MGC was investigated. Accelerated corrosion tests were carried out to determine the optimal formulation of MGC. The corrosion resistance of MGC prepared by different coating method was compared to commercial organic metal coatings, for which the salt spray test, adhesion test, and electrochemical impedance spectroscopy test were conducted. The results showed that the dip-coated specimen of MGC exhibited 63.8% decrease in mass loss, 59.5% decrease in adhesive strength loss, and 38.1% increase in impedance modulus compared to commercial organic metal coatings. Furthermore, the corrosion protection mechanism of MGC was elucidated by analyzing its microstructural characteristics including the functional groups formed on the surface of coated steel bars. In terms of cost, MGC reduced the total cost by about 15 times compared to commercial organic metal coatings.

中文翻译：

---

钢筋无机防腐涂料的开发：耐腐蚀测试与设计


致密结构的三维地质聚合物网络可以有效阻止氯离子的迁移和扩散。本研究开发了一种高效且经济的多组分地质聚合物涂层（MGC），用于抑制和延缓钢材的腐蚀。研究了碱含量、偏高岭土取代率、聚乙烯醇含量和二氧化钛含量对MGC流动性、凝结时间和流变性能的影响。进行加速腐蚀试验以确定 MGC 的最佳配方。将不同涂层方法制备的MGC与商业有机金属涂层的耐腐蚀性能进行比较，并进行盐雾试验、附着力测试和电化学阻抗谱测试。结果表明，与商用有机金属涂层相比，MGC 浸涂样品的质量损失减少了 63.8%，粘合强度损失减少了 59.5%，阻抗模量增加了 38.1%。此外，通过分析其微观结构特征，包括涂层钢筋表面形成的官能团，阐明了MGC的腐蚀防护机制。在成本方面，MGC与商用有机金属涂料相比，总成本降低了约15倍。