锆-钛-钢复合板界面损伤机理及表面耐腐蚀性能研究

Research on Interface Damage mechanism and Surface Corrosion Resistance of Zirconium-Titanium-Steel Clad Plate

摘要:

本文运用内聚力模型研究了锆-钛-钢复合板在粘结试验中的界面损伤过程，并利用扫描电子显微镜分析了界面断裂机理。运用正交试验研究了不同热处理工艺条件下的表面耐腐蚀性能，分析了保温温度、保温时间和升降温速率对粘结性能的影响。结果表明，I型裂纹加载下，界面损伤由内壁处开始，并逐渐发展至整个界面。界面整体属于脆性断裂，而波峰与波谷的过渡斜面则为混合断裂。腐蚀试验的塔菲尔极化曲线研究结果表明，锆覆层在HCl溶液中以点腐蚀为主，而在HAc溶液中以均匀腐蚀为主。爆炸焊接后，锆复合板的耐点腐蚀性能低于纯锆材料，并且保温温度越高，保温时间越长，耐腐蚀性能下降越明显。

Abstract:

In this paper, the cohesive zone model is used to study the interface damage process of zirconium-titanium-steel clad plate in bonding test, and the interface fracture mode is analyzed by SEM observation. The corrosion resistance of the surface under different heat treatment conditions was studied by orthogonal test, and the effects of holding temperature, holding time and temperature rise and fall rate were analyzed. The results show that the interface damage starts from the inner wall and gradually develops to the whole interface under mode-I loading. The whole interface belongs to brittle fracture, while the transition slope of wave crest and wave trough is mixed fracture. The results of Tafel polarization curves show that the main corrosion mode of zirconium coating is spot corrosion in HCl solution and uniform corrosion in HAC solution. After explosive welding, the corrosion resistance of zirconium composite plate is lower than that of pure zirconium material, and worse corrosion-proof ability will be .obtained under higher temperature and longer holding time.