The inhibiting effect of 3-methyl 1,2,4-triazole 5-thione on corrosion of copper in 3% NaCl in presence of sulphide
The inhibiting effect of 3-methyl 1,2,4-triazole 5-thione on corrosion of copper in 3% NaCl in presence of sulphide
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DOI：
10.1016/j.electacta.2006.12.079
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发表时间：
2007-10
影响因子：
6.6
通讯作者：
K. Rahmouni;N. Hajjaji;M. Keddam;A. Srhiri;H. Takenouti
中科院分区：
文献类型：
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作者：
K. Rahmouni;N. Hajjaji;M. Keddam;A. Srhiri;H. Takenouti
研究了硫化物的添加对铜在3% NaCl中腐蚀的影响。硫化物的浓度仍然相当低，最高为10ppm。硫化物对铜腐蚀的影响在文献中存在争议，值得通过各种实验技术来验证。从接近开路电位向负或正方向绘制的极化曲线表明腐蚀电流密度降低，文献中通过 CuS 的保护作用进行了解释。相比之下，具有电沉积铜的石英晶体微天平表明腐蚀速率随着硫化物离子浓度的增加而增加。 EIS 测量还表明，在氯化钠溶液中添加硫化物离子会加速腐蚀速率。结论是海水中硫化物离子的存在加速了铜的腐蚀。为了保护铜结构在硫化物污染物存在下免受腐蚀，研究了新分子3-甲基1,2,4-三唑5-硫酮的防腐效果。该分子的作用导致阳极和阴极电流密度降低，其抑制效率在10mM浓度下达到90%。
The effect of sulphide addition to the corrosion of copper in 3% NaCl was studied. The concentration of sulphide was remained rather low, up to 10ppm. The effect of sulphide to copper corrosion is controversial in the literature and worth to verify by means of various experimental techniques. The polarization curves, plotted from a potential close to the open circuit one to negative or to positive direction indicated a decrease of corrosion current density, explained in the literature by the protective effect of CuS. In contrast, a quartz crystal microbalance, with electro-deposited copper indicated the increase of corrosion rate with increasing sulphide ion concentration. The EIS measurements showed also an acceleration of corrosion rate by addition of sulphide ions in sodium chloride solution. It is concluded that the presence of sulphide ions in the seawater accelerates the corrosion of copper. To protect the copper structure from the corrosion in presence of sulphide as pollutants, the anticorrosion effect of a new molecule, 3-methyl 1,2,4-triazole 5-thione was examined. The action of this molecule results in the reduction of the both anodic and cathodic current density, and its inhibiting efficiency reached a value of 90% at the concentration of 10mM.