直升机结构钢涂层体系防护性能在模拟海洋大气环境中的变化

目的对比、评价服役于海洋大气环境中直升机结构钢防护体系的防护性能。方法通过模拟海洋大气环境加速试验方法,研究直升机结构钢防护体系在实际服役过程中出现的损伤。结果涂层A微观结构较为疏松,加速试验中涂层基体产生鼓泡,并发生腐蚀。电化学阻抗谱(EIS)方法测得低频区的阻抗模值相对较低,说明涂层防护性能较差,与宏观试验结果一致。结论在模拟海洋大气环境的加速试验中,涂层表面的微小缺陷(如疏松结构中的微小孔洞)会成为腐蚀溶液进入的快速通道,进而降低涂层的防护性能。利用电化学阻抗谱(EIS)方法可有效表征有机涂层涂覆下的金属腐蚀行为,并评估涂层的防护性能。

Degradation of Protective Properties of Coatings on Structural Steel Used on Helicopter in Simulated Ocean Atmospheric Environment

Objective To compare and evaluate the protective properties of coatings on structural steel used on helicopter that serves in ocean atmospheric environment. Methods The damage in the protective system of structural steel used on helicopter in service was researched via accelerated testing method of simulating the ocean atmospheric environment. Results Blistering and rusting occurred in the sample of coating A after accelerated testing because of the loose structure of coating A. The |Z| f=0.1Hz measured by the EIS was low so that the protective properties was poor, which was in accordance with the macroscopic obser-vation. Conclusion During the accelerated testing of simulating the ocean atmospheric environment, the small detect in the coatings (such as the porous structure) would become erosion solution entering the fast channel and reducing the protective properties. Corrosion behavior of metal coated by organic coatings can be effectively characterized and the performance of the coating can be accessed by the EIS method.