Service Performance Evaluation of Graphene Modified Heavy Anticorrosive Coating on the Surface of Transmission Tower under Harsh Marine Atmosphere Corrosive EnvironmentEI北大核心CSCD

目前国家电网输电铁塔普遍采用镀锌钢进行施工建设，钢材表面镀锌层可以抑制基体腐蚀，保障输电铁塔长期安全服役。但在沿海地区的苛刻海洋工业大气腐蚀环境中，输电铁塔表面镀锌层易发生快速腐蚀失效。研制一种低表面处理石墨烯改性重防腐涂料体系，包括低表面处理石墨烯防腐底漆、环氧石墨烯阻隔中间漆和聚氨酯耐候面漆。通过实验室性能测试、 环境考核试验和示范工程涂装，对其服役性能进行综合评价。结果表明：研制的石墨烯改性重防腐涂料具有良好的隔水性和低表面处理施工性能，复合涂层耐盐雾性能超过 5 000 h，耐循环老化 4 200 h 后漆膜完整。在国网宁波供电公司北坞 2321 线 10 级输电铁塔示范涂装 54 个月后，石墨烯改性重防腐涂层光泽度降低，漆膜变色 1 级，百格附着力在 0~1 级，拉拔附着力 8.56~11.37 MPa。根据室内模拟加速试验和实际工程服役性能测试结果，研制的石墨烯改性重防腐涂料对输电铁塔在苛刻海洋大气腐蚀环境下的综合防护寿命可达 10 年以上。研究了石墨烯改性重防腐涂料体系的实际服役性能，实现在苛刻海洋大气腐蚀环境中对输电铁塔的长效腐蚀防护，为电网设施的长期腐蚀防护提供可靠途径。

Service Performance Evaluation of Graphene Modified Heavy Anticorrosive Coating on the Surface of Transmission Tower under Harsh Marine Atmosphere Corrosive Environment

The transmission tower of the State Grid are usually constructed of galvanized steel. The galvanized layer can inhibit the corrosion of the substrate and ensure the long-term safe service of the transmission tower. However, in the harsh marine industrial atmospheric corrosion environment in coastal areas, the galvanized layer on the surface of the transmission tower is prone to rapid corrosion failure. Therefore, a surface-tolerant grapheme modified heavy-duty anticorrosion coating system is developed for corrosion protection, including surface-tolerant graphene anticorrosion primer, epoxy graphene barrier intermediate coating, and polyurethane weather-resistant top coating. The comprehensive performance of coatings is investigated by laboratory performance Coating performance, environmental assessment tests, and application in actual projects. Test results show that the prepared graphene modified heavy-duty anticorrosion coating has a good barrier property to water penetration, surface-resistant construction performance, salt spray resistance for more than 5 000 h, and remains intact after 4 200 h of cyclic aging test. After coated on the 10 levels transmission tower (North 2321 Line, State Grid Ningbo Power Supply Company) for 54 months, the gloss of composite coating has been reduced, the color of the paint film is 1 grade, the adhesion obtained by the hundred-grid method is between 0 grade and 1 grade, and the pull-off adhesion is between 8.56 MPa and 11.37 MPa. The graphene modified heavy-duty anticorrosion coating is expected to have a comprehensive protection life of more than 10 years for transmission towers in harsh marine atmospheric corrosion environments. This paper studies the actual service performance of the graphene modified heavy-duty anticorrosive coating system, which realizes the long-term corrosion protection of the transmission tower in the harsh marine atmospheric corrosion environment, and provides a reliable way for the long-term corrosion protection of power grid facilities.