Study On Microstructure And Acid Resistance Of Borosilicate Foam Glass

In this paper, the micro-structure and dilute sulfuric acid corrosion-resistant of the borosilicate foam glass were studied. Through infrared spectra and TEM, the surface structure of the foam glass and microcrystalline were analyzed, respectively. By the methods of SEM and energy spectrum, the erosion of foam glass in the dilute sulfuric acid was analyzed. The corrosion effect of the dilute sulfuric acid with different pH on the structure of the foam glass was researched. Finally, the tiny grains in the foam glass were analyzed by XRD, and why there was such microcrystalline was explainedThe infrared analysis of the micro-structure of the borosilicate foam glass shown that its structure was mainly consisted of [SiO4] tetrahedron, the Si-O structure including possibly three kinds of ring structure . The analysis of [AlO4] characteristic peak indicated that [AlO4] did not exist in the glass structure, Al3+ joined into the glass structure in the form of tetrahedral coordination, and connected with [SiO4] together. The analysis of [BO3] characteristic peak shown that the elements of the B and O were existed as the [BO4], the polymerization of [BO4] and [BO3], and the connection of the [BO3] and [SiO4], no separated [BO3],In addition, At different pH conditions, the dilute sulfuric acid corrosion of the foam glass was researched. It was found that the size of alkali metal ions would not affect the structure if formulation of the matrix was different.Through the TEM analysis, a small number of microcrystalline, in 10 to 100 nm range, were identified as C and B2O3 crystal. Due to uncompleted foaming, a small amount of C joined into the vitreous structure. And the emergence of B2O3 crystal,it was because [BO3] did not participate in the glass-network structure, and the link with [BO4] was weak,, a small amount of B2O3 separated. In the observation of the entire sample, there were no bigger grains.The SEM observation indicated that the structure of specimen after acid corrosion had no significant corrosion phenomenon compared with before acid corrosion . By the observation of the energy spectrum , it was found that the change of Kmol% is linear, and the diffuse process mainly took place in the glass surface.