拉拔应变量对承荷探测电缆用Zn-5Al镀层钢丝组织与性能的影响  

Effect of Drawing Strain on the Microstructure and Properties of Zn-5Al Coated Steel Wire for Load Detection Cables

作　　者：狄增文 王宏斌 贾建平 王金龙 周昊 方峰[2] DI Zengwen;WANG Hongbin;JIA Jianping;WANG Jinlong;ZHOU Hao;FANG Feng(Xuansteel Company,HBIS Group,Xuanhua 075100,China;School of Materials Science and Engineering,Southeast University,Nanjing 210096,China)

机构地区：[1]河钢集团宣钢公司,河北宣化075100 [2]东南大学材料科学与工程学院,江苏南京210096

出　　处：《材料保护》2025年第3期49-59,共11页Materials Protection

摘　　要：为进一步开发高强高耐蚀性的超深油井承荷探测电缆用钢丝,以热浸镀Zn-5Al合金镀层钢丝为研究对象,通过扫描电子显微镜、X射线衍射仪、电子万能试验机、电化学工作站等仪器设备,研究了冷拉拔应变量对镀层钢丝的微观组织结构、力学性能以及耐腐蚀性能的影响。结果表明,在拉拔形变过程中,珠光体由等轴状转变为沿拉拔方向排列的纤维状,片层间距逐渐减小,镀层厚度减薄。拉拔形变量超过2.24时,抗拉强度超过2400 MPa,可满足万米级油井承荷探测电缆铠装钢丝的使用要求。动电位极化曲线和全浸试验结果表明,随着应变量的增大,Zn-5Al镀层钢丝的耐蚀性提高,腐蚀速率降低。中性盐雾腐蚀试验结果表明,从长期腐蚀(506 h)的角度来看,应变量为1.19时耐腐蚀性最佳,腐蚀速率为0.1047 g/(m^(2)·h)。腐蚀产物均主要由Zn_(6)Al_(2)(OH)_(16)CO_(3)·4H_(2)O、Zn_(5)(OH)_(8)Cl_(2)·H_(2)O以及少量疏松的ZnO、Zn_(5)(CO_(3))_2(OH)_(6)组成。经过冷拉拔形变后,腐蚀产物变得细小致密,对基体的保护作用增强。冷拉拔形变不仅可以提高钢丝的强度,还能有效改善镀层钢丝的耐腐蚀性能。In order to further develop steel wires with high strength and corrosion resistance for ultra deep oil well load detection cables,Zn-5Al alloy-coated steel wires were studied.The effects of cold drawing strain on microstructure,mechanical properties and corrosion resistance of coated steel wire were studied by means of scanning electron microscope,X-ray diffraction,electronic universal testing machine,electrochemical workstation and other instruments.Results showed that during the drawing process,the pearlite structure changed from equiaxed to fibrous along the drawing direction,with a gradual decrease in interlamellar spacing and a reduction in coating thickness.When the drawing strain exceeded 2.24,the tensile strength exceeded 2400 MPa,meeting the requirements for steel wire used in the armoring of 10000-meter oil well load detection cables.The results of dynamic polarization curves and full immersion tests showed that as the strain increased,the corrosion resistance of the Zn-5Al coated steel wire improved,and the corrosion rate decreased.The neutral salt spray corrosion test indicated that,in terms of long-term corrosion(506 h),the best corrosion resistance was achieved with a strain value of 1.19,where the corrosion rate was 0.1047 g/(m^(2)·h).The corrosion products mainly consisted of Zn_(6)Al_(2)(OH)_(16)CO_(3)·4H_(2)O,Zn_(5)(OH)_(8)Cl_(2)·H_(2)O,and small amounts of loose ZnO and Zn_(5)(CO_(3))_2(OH)_(6).After cold drawing deformation,the corrosion products became finer and denser,enhancing their protective effect on the substrate.Cold drawing deformation not only increased the strength of the steel wire but also effectively improved the corrosion resistance of the coated steel wire.

关 键 词：珠光体钢丝 Zn-5Al镀层 拉拔形变 微观组织 耐腐蚀性能 

分 类 号：TG115.5[金属学及工艺—物理冶金] TG174.443[金属学及工艺—金属学]