环氧云铁/丙烯酸涂层户外暴露试验与实验室综合加速试验的相关性研究

目的 研究有机涂层在拉萨试验站户外暴露试验与多因素综合高原高寒气候环境模拟加速试验条件下的相关性。方法 以环氧云铁/丙烯酸有机涂层为研究对象，通过开展户外暴露试验和实验室综合模拟加速试验，利用光泽计和色差仪等分析设备，获得用于表征涂层老化性能的色差和失光率变化规律，比较涂层体系在2种试验条件下老化程度。采用ATR-FTIR、EIS等方法研究涂层分子结构变化和不同环境条件对涂层防腐性能的影响，并分析涂层的降解机理。采用Spearman秩相关系数(rhos)法计算涂层体系在2种环境下的相关性。结果 与户外暴露试验12个月相比，综合模拟加速试验60 d，环氧云铁/丙烯酸有机涂层的色差和失光率基本一致，其色差的相关性为0.771 4，失光率的相关性为0.828 6。结论 与拉萨试验站户外暴露试验相比较，环氧云铁/丙烯酸涂层体系在综合加速试验后的色差、失光率、红外光谱、电化学阻抗等关键性能参数变化趋势基本一致，老化机理基本相同。多因素综合高原高寒气候环境模拟加速试验装置能够综合模拟高原高寒气候环境下阳辐射、气压、温度和湿度等环境因素，具有较好的模拟性和相关性。

Correlation between Outdoor Exposure Test and Laboratory Comprehensive Accelerated Test of Epoxy Micaceous Iron/Acrylic Coating

The work aims to study the correlation of organic coatings under the conditions of outdoor exposure test at Lhasa Test Station and multi-factor comprehensive plateau cold climate environment simulation accelerated test.Taking the epoxy micaceous iron/acrylic coating as the research object, through the outdoor exposure test and the laboratory comprehensive simulation accelerated test, analysis devices such as the glossmeter and colorimeter were used to obtain the change rules of color difference and loss of light to characterize the aging performance of the coating, and the aging degree of the coating system under the two test conditions was compared; ATR-FTIR, EIS and other methods were used to study the effect of the change of the molecular structure of the coating and different environmental conditions on the corrosion resistance of the coating, and the degradation mechanism of the coating was analyzed; The correlation of the coating system in two environments was calculated by the Spearman rank correlation coefficient (rhos) method.Compared with the outdoor exposure test for 12 months, the color difference and light loss rate of the epoxy micaceous iron/acrylic coating were basically the same after the comprehensive simulated accelerated test for 60 days. The correlation between the color difference and the light loss rate was 0.771 4 and 0.828 6. Compared with the outdoor exposure test at Lhasa Test Station, the change trend of key performance parameters such as color difference, loss of light, infrared spectrum, electrochemical impedance, etc. of the epoxy micaceous iron/acrylic coating system after the comprehensive accelerated test is basically the same, and the aging mechanism is basically the same. The multi-factor comprehensive plateau cold climate environment simulation accelerated test device can comprehensively simulate the environmental factors such as solar radiation, air pressure, temperature and humidity under the plateau cold climate environment. It has good simulation and correlation.