Mikić Dajana, Radovanović-Perić Floren, Otmačić Ćurković Helena
Research Laboratory for Corrosion Engineering and Surface Protection, University of Zagreb Faculty of Chemical Engineering and Technology, Marulićev trg 19, 10000 Zagreb, Croatia.
Materials (Basel). 2024 Jul 26;17(15):3710. doi: 10.3390/ma17153710.
Currently used organic coatings for the protection of bronze sculptures have a relatively short lifespan as a consequence of strict requirements of conservation ethics, which limit the selection of coatings. For that reason, enhancement of the corrosion protection level and durability of appropriate coatings is needed. The aim of this work was to examine if corrosion protection of bronze by selected acrylic and polyurethane coatings could be improved by using two phosphonic acids, 16-phosphonohexadecanoic acid (COOH-PA) and 12-aminododecylphosphonic acid (NH-PA). Electrochemical measurements (linear polarization and electrochemical impedance spectroscopy, EIS) were performed to gain an insight into the influence of these phosphonic acids on the performance of the coatings during a two-week exposure to artificial acid rain and a three-month outdoor exposure. Besides the influence on the corrosion protection level, the influence on the coating adhesion was examined as well. A pull-off test clearly confirmed that the studied phosphonic acids act as adhesion promoters of both polyurethane and acrylic coatings, while electrochemical studies revealed improvements in corrosion protection levels, especially in the case of the acrylic coating Paraloid B72.
由于保护伦理的严格要求限制了涂料的选择，目前用于保护青铜雕塑的有机涂料使用寿命相对较短。因此，需要提高合适涂料的防腐蚀水平和耐久性。这项工作的目的是研究通过使用两种膦酸，即16-膦酰基十六烷酸（COOH-PA）和12-氨基十二烷基膦酸（NH-PA），是否可以改善所选丙烯酸和聚氨酯涂料对青铜的防腐蚀性能。进行了电化学测量（线性极化和电化学阻抗谱，EIS），以深入了解这些膦酸在为期两周的人工酸雨暴露和为期三个月的户外暴露期间对涂料性能的影响。除了对防腐蚀水平的影响外，还研究了对涂层附着力的影响。拉开试验清楚地证实，所研究的膦酸可作为聚氨酯和丙烯酸涂料的附着力促进剂，而电化学研究表明防腐蚀水平有所提高，尤其是对于丙烯酸涂料Paraloid B72而言。
