Liu Weilin, Li Jiansan, Huang Xiangqi, Bi Jinye
School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China.
Materials (Basel). 2021 Apr 15;14(8):1982. doi: 10.3390/ma14081982.
In this study, calcium carbonate (CaCO) microparticles having pH-sensitive properties were loaded with sodium lignosulfonate (SLS), a corrosion inhibitor. Scanning electron microscope (SEM), UV-VIS spectrophotometer (UV-vis), X-ray diffraction (XRD), and attenuated total reflection-Fourier-transform infrared spectroscopy (ATR-FTIR) were applied to evaluate the properties of the synthetic microparticles. This material could lead to the release of corrosion inhibitor under different pH conditions of the aqueous media. However, the extent of release of the corrosion inhibitor in the acidic media was higher, leading to enhanced shielding effect of the Q235 steel. These microparticles can serve as anti-corrosion additive for epoxy resin-coated Q235 steel. Electrochemical experiments were used to assess the anti-corrosive ability of the epoxy coatings in simulated concrete pore (SCP) solution, confirming the superior corrosion inhibition of the epoxy coating via incorporation of 5 wt % calcium carbonate microparticles loaded with SLS (SLS/CaCO). The physical properties of coating specimens were characterized by water absorption, contact angle, adhesion, and pencil hardness mechanical tests.
在本研究中，将具有pH敏感特性的碳酸钙（CaCO）微粒负载了缓蚀剂木质素磺酸钠（SLS）。应用扫描电子显微镜（SEM）、紫外可见分光光度计（UV-vis）、X射线衍射仪（XRD）和衰减全反射傅里叶变换红外光谱仪（ATR-FTIR）来评估合成微粒的性能。这种材料可在水性介质的不同pH条件下导致缓蚀剂的释放。然而，缓蚀剂在酸性介质中的释放程度更高，从而增强了Q235钢的屏蔽效果。这些微粒可作为环氧树脂涂层Q235钢的防腐添加剂。通过电化学实验评估了环氧涂层在模拟混凝土孔隙（SCP）溶液中的防腐能力，证实了通过掺入5 wt%负载SLS的碳酸钙微粒（SLS/CaCO），环氧涂层具有优异的缓蚀性能。通过吸水性、接触角、附着力和铅笔硬度力学测试对涂层试样的物理性能进行了表征。
