摘要
制备了不同组成的矿渣-偏高岭土基地质聚合物,并进行了硫酸(p H=1.0)浸泡腐蚀实验。通过X射线衍射(XRD)、微观结构(SEM-EDX)、孔结构、质量损失以及力学性能的变化,分析了试样的耐腐蚀性能。力学性能测试结果表明,在硫酸侵蚀过程中,所有样品的抗压强度都明显降低。碱度为5%时,纯矿渣基地质聚合物表现出最好的强度特性,其90d的抗压强度保留率为92.95%。XRD和微观结构分析结果表明,被硫酸侵蚀后,样品表面生成了一层石膏产物。在孔结构方面,相比未被硫酸侵蚀的层,硫酸侵蚀导致样品表面层(0~5mm)的空隙率增大。偏高岭土的加入增加了矿渣基地质聚合物的空隙率,使得其耐酸性有所降低,表明致密的地质聚合物在耐酸腐蚀方面是有利的。
Slag-metakaolin-based polymers of different compositions were prepared and subjected to sulfuric acid(pH=1.0) immersion corrosion experiments in this paper. The corrosion resistance of the specimens was analyzed by X-ray diffraction(XRD), microstructure(SEM-EDX), pore structure, mass loss, and changes in mechanical properties. The results of the mechanical properties tests showed that the compressive strength of all samples decreased significantly during sulfuric acid attack. The pure slag-based polymer exhibited the best strength properties at 5% alkalinity with a 90-day compressive strength retention of 92.95%. XRD and microstructural analysis of sulfuric acid attack generated a layer of gypsum products on the surface of the samples. In terms of pore structure,sulfuric acid erosion resulted in an increase in the void ratio of the surface layer(0~5 mm) of the sample compared to the layer that was not eroded by sulfuric acid. The addition of metakaolin increased the void fraction of the slag base geopolymer, which led to a decrease in acid resistance, indicating that the dense geopolymerwas beneficial in terms of acid corrosion resistance.
作者
刘润
方晓梅
丁可
相继春
崔学民
贺艳
LIU Run;FANG Xiaomei;DING Ke;XIANG Jichun;CUI Xuemin;HE Yan(Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology,School of Chemistry and Chemical Engineering,Guangxi University,Nanning 530004,China)
出处
《化工技术与开发》
CAS
2023年第1期23-28,共6页
Technology & Development of Chemical Industry
基金
自治区级大学生创新创业训练计划项目资助项目(s202110593192)。
