泡沫玻璃砖防腐内衬腐蚀研究

摘要

Etching solution leaked from the thermal power plant wet chimney, which adopted domestic foam glass anti-corrosion lining and worked for a period of time. The performance of the foam glass anti-corrosion lining of it was studied in this paper. The properties of the foam glasses and plaster picking from the chimney lining were characterized by EDS and FT-IR. The results showed that the alkali metals (including Fe, K, Al, Na, Mg and so on) in the domestic foam glasses reacted with the acid corrosive media of the wet gas, which gave rise to the destruction of the closed pore structure and crisp cracking of the bricks; meanwhile, pendant groups on the polysiloxane matrix shed and Si-O-Si rigid structure increased in the main chain, which result in the loss of elasticity and adhesion of the plaster, then the foam dlass anti-corrosion lining fell off.%采用国产泡沫玻璃砖防腐内衬的火电厂湿烟囱，运行一段时间后，出现严重的渗透腐蚀现象。本文以湿烟囱排烟筒上脱落的泡沫玻璃砖为实验对象，利用EDS和FT-IR分别研究了国产泡沫玻璃砖和有机硅防腐胶泥的腐蚀状况及原理。结果表明，国产泡沫玻璃砖中含有Fe、K、Al、Na、Mg等碱金属，遇酸反应，导致砖体密闭孔隙结构破坏，酥化开裂，失去防腐作用；聚硅氧烷基体的侧基脱落，主链中Si-O-Si刚性结构增多，胶泥失去弹性和粘接性，导致防腐内衬整体脱落。