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利用原子力显微镜、电化学测试、电子功函数和钝化膜接触电阻显微划擦方法研究了机械剧烈压入形变和稳定化处理对Cu30Ni合金表面梯度组织和耐腐蚀行为的影响。结果发现,对机械剧烈压入和稳定化处理的试样,表层晶粒尺寸呈梯度变化。从基体到表层,随着晶粒尺寸从40μm逐渐细化到50 nm,电子功函数从4.55 e V提高至4.85 e V,表面电子稳定性提高,钝化膜粘附性能和致密性较好,耐腐蚀性能提高,ip从1.750×10-5A/cm2逐渐降低到0.119×10-5A/cm2,而腐蚀电位EV从-212 m V提高到-193 m V,这是由于机械剧烈压入形变和稳定化处理诱发晶粒呈梯度细化和组织结构中大量结构缺陷存在。
The effects of severe mechanical deformation and stabilization on the surface gradient structure and corrosion resistance of Cu30Ni alloy were studied by atomic force microscopy, electrochemical test, electron work function and passivation film micro-scratching method. The results showed that the grain size of the surface layer changed in a graded manner for the samples that were subjected to severe mechanical press-in and stabilization. From the matrix to the surface, the electron work function increased from 4.55 eV to 4.85 eV with the grain size gradually reduced from 40μm to 50 nm, the surface electron stability was improved, the passivation film adhesion and compactness were better, The corrosion resistance is improved, ip is gradually reduced from 1.750 × 10-5A / cm2 to 0.119 × 10-5A / cm2, and the corrosion potential EV is raised from -212 mV to -193 mV, which is due to severe mechanical deformation Stabilization induced grain refinement gradient and a large number of structural defects in the organizational structure exists.