Ti-Zr-Be-Cu-Co块体非晶合金形成能力及其耐蚀性的研究

Glass Forming Ability and Corrosion Behavior of Ti-Zr-Be-Cu-Co Bulk Metallic Glass

摘要:

采用铜模铸造法制备了Ti35Zr30Be24Cu7.5Co3.5块体非晶合金，利用X射线衍射（XRD）、扫描电镜（SEM）、高分辨透射电镜（HRTEM）以及差示扫描量热分析法（DSC）考察了合金的非晶特性和热力学性能，通过电化学极化试验和变温失重腐蚀试验测试了合金的耐蚀性。结果表明：制备直径12 mm的Ti35Zr30Be24Cu7.5Co3.5块体非晶合金相结构为完全的非晶相，具有较大玻璃形成能力和热稳定性；在0.6 mol/L的NaCl溶液里的电化学腐蚀行为以及在313 K、333 K 1mol/L HCL的变温失重腐蚀中与304不锈钢相比，Ti35Zr30Be24Cu7.5Co3.5块体非晶具有优异的耐腐蚀性能

Abstract:

Ti35Zr30Be24Cu7.5Co3.5 bulk amorphous alloy was prepared by a copper mold casting method. The structure and thermal stability of the bulk amorphous alloy was investigated by means of X-ray diffractometry (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM) and differential scanning calorimetry (DSC). Its corrosion resistance was evaluated by conducting electrochemical corrosion test and variable temperature weightless corrosion test. Results show that the as-prepared Ti35Zr30Be24Cu7.5Co3.5 alloy exhibits an amorphous structure with at least 12 mm diameter, and has a high glass forming ability and a good thermal stability. The corrosion behaviors of Ti35Zr30Be24Cu7.5Co3.5 bulk amorphous alloy and the 304 stainless steel were investigated by an electrochemical method in 0.6 mol/L NaC1 solution and by variable temperature weightless corrosion in 313 K and 333 K 1mol/L HCL solution. Compared with the 304 stainless steel, the Ti35Zr30Be24Cu7.5Co3.5 bulk amorphous alloy has a better corrosion resistance