Vera Rosa, Bagnara Margarita, Henríquez Rodrigo, Muñoz Lisa, Rojas Paula, Díaz-Gómez Andrés
Instituto de Química, Facultad de Ciencias, Pontificia Universidad Católica de Valparaíso, Av. Universidad 330, Placilla (Curauma), Valparaíso 2373223, Chile.
Facultad de Ingeniería y Ciencias, Universidad Adolfo Ibáñez, Diagonal Las Torres 2640, Santiago 7941169, Chile.
Materials (Basel). 2023 Aug 21;16(16):5713. doi: 10.3390/ma16165713.
This study evaluated the behavior of three paint systems exposed to the Antarctic marine environment for 45 months compared to a control of uncoated carbon steel with a determined corrosion rate. At the study site, all environmental conditions, solar radiation, and the concentration of environmental pollutants (Cl- and SO) were evaluated. The paint systems differed in terms of the primer and top coat. Coated samples were studied before and after exposure. They were evaluated visually and using SEM to determine adhesion, abrasion, and contact angle; using the Evans X-Cut Tape Test; using ATR-FTIR spectroscopy to analyze the state of aging of the top layer; and using electrochemical impedance spectroscopy (EIS) for coat protection characterization. The corrosion rate obtained for steel was 85.64 µm year, which aligned with a C5 environmental corrosivity category. In general, the evaluation in the period studied showed the paint systems had good adhesion and resistance to delamination, without the presence of surface rust, and exhibited some loss of brightness, an increase in the abrasion index, and a decrease in the percentage of reflectance due to aging. EIS showed good protection capability of the three coating schemes. In general, this type of paint system has not previously been evaluated in an extreme environment after 45 months of exposure to the environment. The results showed that the best behavior was found for the system whose top layer was acrylic-aliphatic polyurethane.
本研究评估了三种涂料体系在南极海洋环境中暴露45个月后的性能，并与具有确定腐蚀速率的未涂覆碳钢对照进行了比较。在研究地点，对所有环境条件、太阳辐射以及环境污染物（Cl-和SO）的浓度进行了评估。这些涂料体系在底漆和面漆方面存在差异。对涂覆样品在暴露前后进行了研究。通过目视检查以及使用扫描电子显微镜（SEM）来确定附着力、耐磨性和接触角；使用埃文斯X切割胶带试验；使用衰减全反射傅里叶变换红外光谱（ATR-FTIR）分析顶层的老化状态；并使用电化学阻抗谱（EIS）对涂层保护性能进行表征。获得的钢的腐蚀速率为85.64 µm/年，这与C5环境腐蚀性类别相符。总体而言，在所研究的时间段内的评估表明，涂料体系具有良好的附着力和抗分层性，没有表面生锈现象，并且由于老化出现了一些亮度损失、磨损指数增加以及反射率百分比降低的情况。EIS表明三种涂层方案具有良好的保护能力。一般来说，此前尚未对这种类型的涂料体系在暴露于环境45个月后的极端环境中进行评估。结果表明，顶层为丙烯酸-脂肪族聚氨酯的体系表现最佳。
