B30铜镍合金在海水中的电化学行为  

Electrochemical Behavior of B30 Cu-Ni Alloy in Seawater

作　　者：迟长云[1,2] 李宁[2] 薛建军[1] 王洪仁[2] 许立坤[2] 

机构地区：[1]南京航空航天大学材料科学与技术学院,江苏南京211100 [2]中船重工七二五研究所青岛分部海洋腐蚀与防护国防科技重点实验室,山东青岛266071

出　　处：《材料保护》2009年第8期19-22,共4页Materials Protection

摘　　要：B30铜镍合金具有优良的耐海水腐蚀性能,但在海水中形成的表面膜对其自身的电化学行为有影响,过去对此研究不多。采用交流阻抗、线性极化、动电位极化、循环阳极极化等方法研究了B30铜镍合金表面在海水中形成的氧化膜对其自身腐蚀电化学行为的影响,采用原子力显微镜(AFM)对氧化膜的结构进行了分析。结果表明:B30铜镍合金在海水中浸泡72 h后,表面能够生成一层完整致密的氧化膜;表面膜使B30铜镍合金在海水中的阻抗值随浸泡时间的延长先增大后减小,而且能够降低其极化电流密度以及瞬时腐蚀速率;随着浸泡时间的延长,B30铜镍合金在海水中的点蚀倾向加重。The influ-ence of the oxide film on the electrochemical behavior of B30 Cu-Ni alloy was studied by making use of linear polarization, potentiody-namic polarization, electrochemical impedance spectroscopic and cyclic anodic polarization measurements. The microstructure of the oxide film formed on the surface of Cu-Ni alloy in seawater was an-alyzed by means of atomic force microscopy. Results show that an intact and compact oxide film is formed on the surface of the alloy after 72 h immersion in seawater. The resistance Rf of the oxide film initially increased and then decreased with extending immersiontime. And the formation of the oxide film lead to a decreased polar-ization current density and transient corrosion rate of the Cu-Ni al-loy. Moreover, the pitting corrosion of the alloy became increasing-ly severe with extending immersion time.

关 键 词：电化学行为 B30铜镍合金 表面氧化膜 海水腐蚀 

分 类 号：TG174.3[金属学及工艺—金属表面处理]