Abstract: One of the most important factors of carbonate decay is the chemical attack caused byatmos pollutants such as S0₂. A $O, ageing system was designed to evaluate the effects of S0₂(30 mg/m hencon two commercial fluoro-organosilane(Pelicoat and Mellerud )for the protection of carbonate stone. The coating's protective efficiency and hydrophobicity were investigated by water absorption by It ancapilla contact angle respectively. The corrosion degree of carbonate stone was determined by the sulfate formed on ion chromatography. The results s\ wd that their protective efficiency decreased after 480 the specimensh ageing.It was found that the contact-angle and protective efficiency against SO₂ decreased for Pelicoat and Mellerud with the ageing time. The decreasing extent of contact angle for Pelicoat was higher than Melle-d. The surface analyses of the by SEM showed some change in superficial morphology after stone samples the ageing, suggesting that the pores became larger and the number of pores increased

Key words: SO₂, protective coatings, carbonate stone, corrosion, ageing

摘要： 大气中 ＳＯ_２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 ＳＯ_２老化装置来评价两种有机硅防护涂料（Ｐｅｌｉｃｏａｔ和 Ｍｅｌｌｅｒｕｄ），在浓度 ３０ｍｇ／ｍ^３ ＳＯ_２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 ４８０ｈ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 ＳＯ_２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。

关键词: ＳＯ_２, 防护涂料, 石灰岩, 腐蚀, 老化