【摘要】 通过扫描电子显微镜观察镀锌钢丝冷拉拔前后的组织形貌，并利用X射线衍射仪分析镀层的物相结构变化，最后进行电化学性能测试，以研究冷拉拔前后镀锌钢丝耐蚀性变化。结果表明，经二次冷拉拔后钢丝的抗拉强度由盘条的1 050 MPa提高到2 035 MPa,基体组织演变为沿拉拔方向的纤维状；镀层减薄显著，自腐蚀电位无明显变化，并保持在-1.04～-1.02 V范围内，但自腐蚀电流密度由6.080×10^-5 A·cm^-2降低到0.861×10^-5 A·cm^-2,且阻抗弧明显变大；冷拉拔形变使得镀锌钢丝的强度和耐蚀性均得到了提高。更多还原

【Abstract】 Microstructure of galvanized steel wire before and after cold drawing was observed by scanning electron microscopy, phase structure changes of the coating were analyzed by X-ray diffraction, and corrosion resistance changes were also studied by electrochemical performance testing. Results showed that tensile strength of the steel wire increased from 1 050 MPa to 2 035 MPa after secondary cold drawing, and matrix structure evolved into a fibrous structure along drawing direction. Besides, coating thickness was significantly decreased, and the self corrosion potential showed no significant change, which remained within the range of-1.04 V and-1.02 V. However, corrosion current density reduced from 6.080×10^-5 A·cm^-2 to 8.607 × 10^-6 A·cm^-2, and impedance arc significantly increased. As a result, cold drawing deformation could not only enhance the strength of galvanized steel wire, but also enhance its corrosion resistance.更多还原