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为了提高钢丝的耐腐蚀性能,使用连续涂覆工艺制备一系列锆基非晶合金(Zr_(41.2)Ti_(13.8)Cu_(12.5)Ni_(10)Be_(22.5))_(100-x)Nb_x(x=0,3,5,8,at%)涂覆Q195钢丝。相分析结果表明,涂层主要由非晶基体和一些金属间化合物组成;阳极极化实验发现所有非晶涂覆钢丝表现钝化行为,具有高的点蚀破钝电位和低的腐蚀电流。随着非晶涂层中铌含量增加,非晶涂覆钢丝的钝化区宽度增加,点蚀破钝电位升高。电子能谱分析发现,非晶涂覆钢丝抗点蚀性能提升可能与金属铌元素容易钝化,形成稳定钝化膜,同时能够稳定锆、钛,降低相分离有关。
In order to improve the corrosion resistance of steel wire, a series of Zr-based amorphous alloys (Zr_ (41.2) Ti_ (13.8) Cu_ (12.5) Ni_10Be_ (22.5)) _ (100-x) Nb_x (x = 0, 3, 5, 8, at%) coated Q195 steel wire. The phase analysis results show that the coating mainly consists of amorphous matrix and some intermetallic compounds. Anodic polarization experiments show that all of the amorphous coated steel wires exhibit passivation behavior, high pitting corrosion potential and low corrosion current. With the increase of niobium content in the amorphous coating, the width of the passivation area of the amorphous coated steel wire increases, and the pitting corrosion increases. Electronic energy spectrum analysis showed that the improvement of pitting corrosion resistance of amorphous coated steel wire might be related to the easy passivation of niobium metal to form a stable passive film and to stabilize zirconium and titanium and reduce the phase separation.