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大气中SO2气体是造成石灰质文物化学腐蚀的最重要因素之一.设计了一套SO2老化装置来评价两种有机硅防护涂料(Pelicoat和Mellerud),在浓度30 mg/m3SO2下的防护石材效果情况.使用毛细管吸收量评价防护涂料的保护程度,使用接触角评价防护涂料的疏水性,使用离子色谱测定石灰岩腐蚀层中形成的硫酸盐,根据硫酸盐的量决定石灰岩的腐蚀程度.实验结果表明,两种防护涂料老化480 h后,其保护系数均有不同程度的减少.随着老化时间的增加,用Pelicoat、Mellerud涂覆的样品接触角逐渐减少,Pelicoat的降幅要大于Mellerud,两种防护涂料抗SO2防护效果下降.SEM电镜发现样品经过老化涂覆后,试样表面孔隙变大、孔隙数增加.

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