BTA@SPANI-POSS环氧涂层的制备及防腐性能

为提高环氧涂层在腐蚀环境下的防腐性和持久性，合成一种负载有缓蚀剂苯并三唑(BTA)的苯并三唑@磺化聚苯胺功能化倍半硅氧烷(BTA@SPANI-POSS)，随后将 BTA@SPANI-POSS 与环氧树脂共混得到 BTA@SPANI-POSS 环氧涂料， 最后在 Q235 碳钢上制备数种复合环氧涂层。通过红外光谱、紫外可见光谱、扫描电子显微镜对 BTA@SPANI-POSS 的结构、 缓蚀性能、表面形貌进行表征，利用接触角测量仪、电化学工作站研究所制备涂层的疏水性能和防腐性能。研究表明，随着 SPANI-POSS 的添加，涂层沾湿性能降低。电化学阻抗谱(EIS)和塔菲尔极化曲线测试结果表明，与 SPANI-POSS 环氧涂层相比，负载有 BTA 的 BTA@SPANI-POSS 环氧涂层对金属基底具有更高和更持久的保护能力，其中试样 EB_1.5%的腐蚀电流密度 i_corr为 16.67 ? A·cm^?2 ，其极化电阻 R_p为 2.467 M?·cm² ，具有较低的腐蚀动态速率。在 3.5 wt.% NaCl 溶液中浸泡 15 d 后环氧涂层仍具有良好的防腐蚀效果，其阻抗值 Z_0.01Hz 仍保留有第 1 d 时的 26.89%，表现出优异的长期稳定性和防腐性能。归因于 SPANI-POSS 与 BTA 之间的协同作用，所制备的 BTA@SPANI-POSS 环氧涂层在浸泡过程中与碳钢基底发生络合反应，从而起到长时间的保护作用。

Preparation and Anticorrosive Performance of BTA@SPANI-POSS Epoxy Coating

Benzotriazole (BTA) is loaded on sulfonated polyaniline functionalized polyhedral oligomeric silsesquioxane (SPANI-POSS) to obtain benzotriazole @ sulfonated polyaniline functionalized polyhedral oligomeric silsesquioxane (BTA@SPANI-POSS). Then BTA@SPANI-POSS is blended with epoxy resin to obtain BTA@SPANI-POSS epoxy coating. Finally, several composite epoxy coatings are prepared on Q235 carbon steel. The structure, slow-release properties and surface morphology of BTA@SPANI-POSS are characterized by infrared spectroscopy, ultraviolet-visible spectroscopy and scanning electron microscopy. The hydrophobic and anticorrosive properties of the coating are studied by contact angle measuring instrument and electrochemical workstation. The results show that with the addition of SPANI-POSS, the wettability of the coating decreases. The electrochemical impedance spectroscopy (EIS) and tafel curve test results show that compared with SPANI-POSS epoxy coating, BTA@SPANI-POSS epoxy coating loaded with BTA have higher and longer protection ability for metal substrate, in which the corrosion current density i_corr of EB_1.5% is 16.67 ? A·cm^?2 , and its polarization resistance R_p is 2.467 M?·cm² . After soaking in 3.5 wt.% NaCl solution for 15 d, the epoxy coating still has a good anti-corrosion effect, and its impedance value Z_0.01Hz is still 26.89% of that of the first day, showing excellent long-term stability and anti-corrosion performance. Owing to the synergistic effect between SPANI-POSS and BTA, the prepared BTA@SPANI-POSS epoxy coating reacts complexly with the carbon steel substrate during soaking, thus playing a long-term protective role.