T2铜在不同海水飞溅条件下的腐蚀性能差异

目的研究T2铜在不同飞溅条件下的腐蚀行为。方法通过对T2铜在三亚热带海水飞溅区进行0.5、1、2 a三个周期的环境试验,采用扫描电子显微镜、X射线衍射仪对其腐蚀产物形貌、物相进行分析,使用电化学工作站对带锈样品进行分析。结果 T2铜在堤岸飞溅区和堤岸内飞溅区腐蚀速率随时间的延长逐渐下降。在飞溅区,不同周期T2铜的腐蚀产物为表面较薄的氧化层,且存在分层现象,主要由外层疏松的绿色Cu2(OH)3Cl和内层致密的棕色Cu_2O组成。不同试验周期,两处飞溅区试样表面的腐蚀产物都较为平整,堤岸飞溅区腐蚀产物层的平均厚度大于堤岸内飞溅区,腐蚀形貌均为均匀腐蚀。两处飞溅区锈层均由Cu_2O和Cu2(OH)3Cl相构成,堤岸飞溅区锈层主要为Cu_2O和Cu2(OH)3Cl相,堤岸内飞溅区锈层主要为Cu_2O相,存在少量Cu2(OH)3Cl相。结论在同一试验地点进行飞溅试验,由于飞溅条件不同,2a内铜的腐蚀速率、腐蚀产物等会存在差异。

Different Corrosion Behaviors of T2 Copper in Different Splash Conditions

Objective To study corrosion behaviors of T2 copper in different splash conditions. Methods The environmental test of T2 copper in Sanya tropical marine splash zone was carried out for 3 cycles of 0.5, 1 and 2 years. Then, the corrosion products were analyzed with scanning electron microscope and X-ray diffractometer; and the corrosion behaviors of T2 copper under different splash conditions were studied with electrochemical workstation. Results The corrosion rate of T2 copper in the splash zone of embankment and nearing the splash zone of embankment decreased with time. In different periods, corrosion products of T2 copper on the splash zone was a thin oxide layer of stratification on the surface. The corrosion products mainly were composed of loose green Cu2(OH)3Cl in the outer layer and dense brown Cu2O in the inner layer. In different test cycles, the surface corrosion products of samples were relatively flat. The corrosion product layers on the splash zone of embankment were thicker than those nearing the splash zone of embankment. The corrosion morphology of samples was uniform corrosion. The rust layers in both splash areas were composed of Cu2O and Cu2(OH)3Cl phases. The main Cu2O and Cu2(OH)3Cl phases were found on the rust layer of the embankment splash area. The rust layer nearing the splash zone of embankment was mainly Cu2O phase with a small amount of Cu2(OH)3Cl phase. Conclusion The corrosion rate and corrosion products of T2 copper will be different during 2 years environmental test due to different splash conditions at the same test site.