放热体系对粉煤灰玻璃/陶瓷复合涂层耐蚀性的影响

Effect of Exothermic Chemical System on Corrosion Resistance of Glass-ceramic Composite Coatings from Fly Ash

以粉煤灰及少量SiO2、Al2O3、MgO和钠长石为主要原料,采用热化学反应法在Q235钢基体上制备了玻璃/陶瓷复合涂层。在此基础上添加10%的Al-TiO2-B2O3体系,通过对涂层形貌、物相、抗热震性、孔隙率及耐蚀性测试研究放热体系对复合涂层组织和性能的影响。实验结果表明:Al-TiO2-B2O3放热体系的加入可以促进热化学反应生成更多的新相,同时低熔点的Al粉可以优先熔化,填充涂层的孔隙和裂纹,利于提高复合涂层的性能。

Fly ash and little SiO2, Al2O3, MgO, albite were used as raw materials to prepare glassceramic composite coatings on the substrate of Q235 steel by thermal-chemical reaction method. Ten percent of Al-TiO2-B2O3 system were extra added on this basis and the effect of exothermic chemical system on microstructure and properties of composite coatings were researched by the measurement of morphology, composition, thermal shock resistance, porosity and corrosion ：resistance. The results show that Al-TiO2-B2O3 exothermic chemical system could spur more new phases produced by thermal-chemical reaction method. Moreover, low-melting Al powers could be melted precedence over all others to fill the crack and pore, which was beneficial to improve the properties.