苦咸水中氯离子对铜腐蚀行为的影响

采用失重法和电化学方法对铜在模拟苦咸水溶液中的腐蚀电化学行为进行了研究。结果表明, 铜在所用模拟苦咸水中呈现典型的孔蚀特性;并且随着Cl^- 的加入使铜在该体系中的自腐蚀电位和孔蚀电位大大降低,说明Cl^- 对铜具有很强的侵蚀性,与纯NaCl溶液中的各数据比较,都向正方向移动,苦咸水溶液中的其他阴离子,如HCO^-3 或SO₄^-2 ,抑制了Cl^- 对铜的破坏作用。

The effect of Cl~- on corrosion behaviour of copper in bitter and brackish solution

The electrochemical behaviors of copper in the simulating bitter and brackish solution was studied using weight method and electrochemical techniques. In the present simulating solution, copper possesses typical characteristics of pitting corrosion. And the presence of chloride ions in the above solution the shifted the corrosion and breakdown potentials towards more negative values, indicating chloride ions have an aggressive effect on copper. Nevertheless the values are still move positive, compared to the values obtained in pure chloride solutions, showing that other anions in the simulating bitter and brackish solutions, such as, HCO - 3 or SO 2- 4,have an inhibiting effect on copper corrosion attacked by chloride anions.