School of Civil Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150090, China.
School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150001, China.
ACS Appl Mater Interfaces. 2023 Jun 14;15(23):28618-28625. doi: 10.1021/acsami.3c04870. Epub 2023 Jun 2.
Hydrogels are formed through the cross-linking of hydrophilic polymer chains within an aqueous microenvironment. A novel synthesis strategy, UV-initiated frontal polymerization to quickly synthesize bubble-free, self-propagating hydrogel anticorrosive coatings in aqueous conditions, was presented, in which the self-propagating polymerization rate reached 16.7 mm min. SEM, AFM, FTIR, EIS, IC, XPS, and ultra-depth-of-field microscopy were used to characterize the surface morphology and anti-corrosion properties of the hydrogel coating. The addition of nano-SiO formed dense hydrogen bonds, and the stability of the three-dimensional network was enhanced. Underwater, the hydrogel coating could physically block corrosive media from reaching steel surfaces, and it was 75% effective at blocking chloride ions after 7 days under osmotic pressure. In addition, 1,2,4-triazole accumulated on the steel surface, and then the active anti-corrosion function took effect. This paper provides the basis for the in situ synthesis of hydrogel anticorrosive coatings on the surface of mild steel in a wet or underwater state.
水凝胶是通过亲水性聚合物链在水微环境中的交联形成的。提出了一种新的合成策略，即紫外光引发的正面聚合，可在水相条件下快速合成无气泡、自蔓延的水凝胶防腐涂层，其中自蔓延聚合速率达到 16.7mm min。采用 SEM、AFM、FTIR、EIS、IC、XPS 和超景深显微镜对水凝胶涂层的表面形貌和耐腐蚀性能进行了表征。纳米 SiO 的加入形成了致密的氢键，增强了三维网络的稳定性。在水下，水凝胶涂层可以物理阻挡腐蚀性介质到达钢表面，在渗透压下 7 天后，对氯离子的阻断率达到 75%。此外，1,2,4-三唑在钢表面积累，然后发挥活性防腐作用。本文为在湿态或水下状态下在低碳钢表面原位合成水凝胶防腐涂层提供了依据。
