铁含量对形变热处理B30铜镍合金电化学性能的影响

Effect of Iron Content on the Electrochemical Properties of B30 Copper-Nickel Alloy after Thermomechanical Treatment

本文以不同铁含量的B30铜镍合金为研究对象,通过动电位极化曲线、循环伏安曲线和电化学阻抗谱等试验,对比了B30铜镍合金在3.5%NaCl溶液中的耐蚀性。结果表明:随着浸泡腐蚀时间的延长,三种成分的B30铜镍合金在3.5%NaCl溶液中耐蚀性能会随着表面钝化膜的形成均有所改善;同时,随着铁含量的增加,B30铜镍合金在3.5%NaCl溶液中的耐蚀性能先提高后降低。当铁含量为1.2%时,自腐蚀电流和维钝电流密度显著低于其他两种成分合金,而且保护电位更正,点蚀后的再钝化能力更强,耐蚀性能最佳。

This paper takes B30 copper-nickel alloy with different iron content as the research object, and the corrosion resistance of B30 copper-nickel alloy in 3.5% NaCl solution was compared through experiments such as potentiodynamic polarization curve, cyclic voltammetry curve and electrochemical impedance spectroscopy. The results show that with the extension of the immersion corrosion time, the corrosion resistance of the three-component B30 copper-nickel alloys in 3.5% NaCl solution is improved due to the formation of the surface passivation film. Meanwhile, with the increase of iron content, the corrosion resistance of B30 copper-nickel alloy in 3.5% NaCl solution increases first and then decreases. When the iron content is 1.2%, the self-corrosion current and the passivation current density are significantly lower than that of the other two component alloys. Moreover, the protection potential is more positive, the re-passivation ability after pitting corrosion is stronger, and the corrosion resistance is the best.