空心微珠改性无机硅酸锌涂层的防护性能

Protective Property of Inorganic Zinc-silicate Coatings Modified by Cenospheres

用粉煤灰中提取的空心微珠对无机硅酸锌涂层进行改性,通过电化学测试和盐雾试验对比研究无机硅酸锌涂层改性前后的耐腐蚀性能,并利用扫描电镜观察涂层的微观结构。结果表明:经预处理后的空心微珠改善了涂层的耐腐蚀性能,空心微珠的加入显著提高了涂层的致密度。此外,在腐蚀过程中生成的腐蚀产物与涂层微孔结构结合良好,有效提高了腐蚀介质向涂层内部渗透的阻力,对基体起到了良好的保护作用。

Inorganic zinc-silicate coatings were modified by cenospheres extracted from fly ash. The corrosion resistance of the coatings before and after modification was contrasted by electrochemical tests and salt spray test. The microstructure of the coatings was observed by scanning electron microscope （SEM）. The results showed that the corrosion resistance of the coatings could be improved by adding the preprocessed cenosph- eres. The density of zinc-silicate coatings was obviously improved by adding cenospheres. In addition, the cor- rosion products generated in the corrosion process combined were well with the micro-porous coatings＇ structure, which increased the resistance of corrosive medium permeating into the coatings effectively, and then effectively protected the substrate.