Chemical characterisation of the steel-geopolymeric gel interface
Chemical characterisation of the steel-geopolymeric gel interface
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DOI：
10.1016/j.colsurfa.2007.03.004
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发表时间：
2007-07-20
影响因子：
5.2
通讯作者：
van Deventer, J. S. J.
中科院分区：
文献类型：
--
作者：
Yong, S. L.;Feng, D. W.;van Deventer, J. S. J.
因此，了解不锈钢和纯铁与土聚物凝胶的相互作用具有重要意义。采用不同碱浓度和硅铝比的人工成胶溶液，研究了Al-Si前驱体对凝胶与基材相互作用的影响。用傅里叶变换红外光谱-镜面反射光谱(FTIR)、X射线光电子能谱(XPS)和俄歇能谱(AES)研究了凝胶/基质界面的凝胶化过程和相互作用。研究发现，不同的成胶溶液形成不同的结构，反应生成不同组成和结构的铝硅酸盐凝胶。高硅铝比的人工凝胶形成的结构中，硅铝比随着聚合度的增加而降低，而在低硅铝比时，形成了更多的有序结构，其硅铝比几乎是恒定的。铝硅酸盐凝胶在铁衬底上的生长比在不锈钢衬底上更快。在界面处，存在一个过渡区，其中的Si/Al比与块体凝胶不同。在凝胶/金属界面，铁和不锈钢衬底的硅铝比均小于I。FTIR和XPS结果表明，凝胶聚合物与铁基基质之间的化学作用可能归因于Al-O-Fe键的形成。凝胶与氧化层发生了反应，形成了过渡区。(C)2007 Elsevier B.V.保留所有权利。
Geopolymers could be used as non-combustible adhesives for steel, so that it is important to understand the interaction of stainless steel and pure iron with geopolymeric gel. Different artificial gel forming solutions with varied concentrations of alkali and Si/Al ratio were used to investigate the effect of the Al-Si precursors on the interactions between the gel and substrates. The gelation process and the interactions at the gel/substrate interface were studied by Fourier transform infrared spectroscopy-specular reflectance (FTIR), X-ray photoelectron spectroscopy (XPS) and Auger spectroscopy (AES). It was found that the different gel forming solutions formed different structures, which reacted to yield alummosilicate gels of different composition and structure. Artificial gel forming solutions with high Si/Al ratios formed structures in which the Si/Al ratio decreased with increasing polymerisation, whereas at low Si/Al ratios, more ordered structures with almost a constant Si/Al ratio were formed. The aluminosilicate gel growth was more rapid on an iron than a stainless steel substrate. At the interface, there was a transition zone in which the Si/Al ratio differed from the bulk gel. At the gel/metal interface, the Si/Al ratio was less than I for both iron and stainless steel substrates. FTIR and XPS results indicated that the chemical interactions between gel polymer and iron-based substrates were likely attributed to the formation of the Al-O-Fe bond. The gel has reacted with the oxide layer, forming the transition zone. (C) 2007 Elsevier B.V. All rights reserved.