焙烧温度对阻锈剂插层水滑石效果的影响
孙 涛1，熊传胜1，2，金祖权1，2，郭向柯1，陈兆毅3

(1.青岛理工大学 土木工程学院，山东 青岛 266520; 2.海洋环境混凝土技术教育部工程研究中心，山东 青岛 266520; 3.中国铁路设计集团有限公司，天津 266033)

镁铝水滑石; 亚硝酸盐; VB3; 负载率; 形貌变化

Effect of calcination temperature on intercalation hydrotalcite with rust inhibitors
SUN Tao1, XIONG Chuansheng1,2, JIN Zuquan1,2, GUO Xiangke1, CHEN Zhaoyi3

(1.School of Civil Engineering,Qingdao University of Technology, Qingdao 266033, China; 2.Engineering Research Center of Concrete Technology under Marine Environment, Ministry of Education, Qingdao 266520, China; 3.China Railway Design Corporation, Tianjin 300300, China)

layered double hydroxide; nitrite; VB3; loading rate; change of morphology

DOI: 10.15986/j.1006-7930.2023.04.010

备注

研究焙烧温度对NO-2和维生素B3(VB3)两种阻锈剂插层水滑石的影响,通过有机元素和紫外-可见分光光度分析阻锈剂的插层负载率,采用OPC、EIS测试,分析了阻锈剂插层水滑石对钢筋的防护性能,利用SEM和XRD分析插层机理,结论如下:焙烧温度对阻锈剂负载率的影响呈先增后减的趋势.对于NO-2,最佳温度为500 ℃,N元素含量为1.63%,对于VB3,最佳温度为450 ℃,负载率为21.3 wt.%.温度过低,水滑石表面能未被充分激发,温度过高,水滑石层状结构被破坏,阻锈剂难以插层.此外,插层阻锈剂后,水滑石层间距有不同程度的增大,且相比NO-2,插层VB3的水滑石分散更加均匀.
In this paper, the effects of calcined temperature on intercalation hydrotalcite with NO-2 and Vitamin B3(VB3)as rust inhibitors are studied. The intercalation loading rate of rust inhibitor is analyzed by organic elements and UV visible spectrophotometry, the protective performance of the rust inhibitor intercalated hydrotalcite on the steel bar is analyzed by OPC and EIS tests, and the intercalation mechanism is analyzed by SEM and XRD. The conclusion is as follows: the effect of roasting temperature on the loading rate of rust inhibitor increases first and then decreases. For NO-2, the optimum temperature is 500 ℃, and the content of N element is 1.63%. For VB3, the optimum temperature is 450 ℃, and the loading rate is 21.3 wt.%. When the temperature is too low, the surface energy of hydrotalcite is not fully excited, and when the temperature is too high, the layered structure of hydrotalcite is destroyed, and the rust inhibitor is difficult to intercalate. In addition, the interlayer spacing of hydrotalcite increases in different degrees after intercalation of rust inhibitor, and the hydrotalcite intercalated with VB3 is more evenly dispersed than that of NO-2.