A study of the corrosion inhibition of carbon steel in a bromide solution using fractal analysis
A study of the corrosion inhibition of carbon steel in a bromide solution using fractal analysis
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DOI：
10.1016/j.surfcoat.2008.07.029
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发表时间：
2008-10
影响因子：
5.4
通讯作者：
E. Sarmiento;J. González-Rodríguez;J. Uruchurtu
中科院分区：
文献类型：
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作者：
E. Sarmiento;J. González-Rodríguez;J. Uruchurtu
这项工作提出了在溴化锂-乙二醇溶液和不同浓度的硝酸锂（LiNO3）作为缓蚀剂存在下的低碳钢腐蚀条件下获得的电化学噪声结果。利用Hurst提出的Rescale Range Analysis （R/S）方法，从电化学噪声时间序列的分形维数进行评价。将不同缓蚀剂浓度的钢暴露在溴化锂环境中，并进行电化学电位/电流噪声测量。然后根据得到的时间序列计算不同工况信号的分形维数。该维数由经验法则R/S=(τ/2)得到，其中R表示变量的最大值与最小值之差，S表示时间序列的标准差，τ表示测量的时间周期，H表示0<H<1之间的Hurst指数。时间序列的Hurst指数和分形维数的计算来源于R/S图的斜率。为了进行比较，还进行了电化学阻抗谱分析。电化学噪声的分形分析有助于评价缓蚀剂在腐蚀条件下的保护性能。
This work presents the electrochemical noise results obtained for mild steel corrosion conditions under a lithium bromide–ethylene glycol solution and in the presence of different concentrations of lithium nitrate (LiNO3) as corrosion inhibitor. Evaluation was performed from the fractal dimension of the electrochemical noise time series obtained using the so called the Rescale Range Analysis (R/S) proposed by Hurst. The steel under different inhibitor concentrations were exposed to a lithium bromide environment and electrochemical potential/current noise measurements were performed. Afterwards, the fractal dimensions were calculated from the time series obtained for the different condition signals. This dimension is obtained from the empirical law R/S=(τ/2)Hwhere R represents the difference between the maximum and minimum values of the variable, S the standard deviation of the time series, τ is the period of time measured and H the Hurst exponent between 0<H<1. The calculation of the Hurst exponent and fractal dimension of the time series comes from the slope of the R/S plot. For comparison electrochemical impedance spectroscopy was also performed. The fractal analysis of electrochemical noise helps to evaluate the inhibitor protection performance under the corrosion conditions tested.