The corrosion behaviour of Cu–2Ti and Cu–2Zr (wt%) alloys has been assessed by open-circuit potential and electrochemical impedance spectroscopy measurements carried out in 3.5 wt% NaCl solution, at approximately neutral pH, without stirring and in contact with the air. For comparison, the electrochemical tests have also been carried out on unalloyed Cu. Electrochemical impedance results showed that Ti and Zr alloying additions significantly increased the corrosion resistance of copper, the best behaviour being observed for the Cu–2Zr alloy. This improvement may be ascribed to the formation of Ti- or Zr-enriched passive layer, which exhibits higher protective effectiveness compared with that of unalloyed Cu.

中文翻译：

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Cu-2Ti 和 Cu-2Zr (wt%) 合金在中性充气氯化钠溶液中的腐蚀行为

Cu-2Ti 和 Cu-2Zr (wt%) 合金的腐蚀行为已通过在 3.5 wt% NaCl 溶液中进行的开路电位和电化学阻抗谱测量来评估，在大约中性 pH 值下，没有搅拌和接触空气。为了比较，还对非合金铜进行了电化学测试。电化学阻抗结果表明，Ti 和 Zr 合金化添加显着提高了铜的耐腐蚀性，在 Cu-2Zr 合金中观察到的最佳行为。这种改进可能归因于形成了富含 Ti 或 Zr 的钝化层，与非合金 Cu 相比，其表现出更高的保护效果。