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Jinan, China

Zhou C.,Tianjin University | Wang J.,Tianjin University | Song S.,Tianjin University | Xia D.,University of Alberta | And 4 more authors.
Journal Wuhan University of Technology, Materials Science Edition | Year: 2013

The corrosion process of phenolic epoxy coated tinplate in energy drink was investigated by in-situ electrochemical impedance spectroscopy(EIS) and electrochemical noise(EN) techniques. The experimental results indicate that the degradation process of novolac epoxy coated tinplate in energy drink can be divided into three main stages: organic coating wetted by the beverage; corrosion initiation beneath the organic coating; and corrosion extension process. It was proposed that the tin coating and carbon steel were mainly corroded by organic acids in energy drink through the pores of the organic coating. After the tin coating was corroded,the carbon steel started to corrode due to its higher electrochemical activity and became to be the dominated corrosion reaction. © Wuhan University of Technology and SpringerVerlag Berlin Heidelberg 2013. Source


Xu A.,PLA Military Transportation University | Zhang F.,PLA Military Transportation University | Luo B.,PLA Military Transportation University | Luo B.,94277 Unit of the PLA | And 2 more authors.
International Journal of Electrochemical Science | Year: 2013

Electrochemical impedance spectroscopy (EIS) of an organic coating system in 3.5% NaCl solution was measured and a new parameter k(f) named changing rate of phase angle at high frequency is extracted directly from Bode plots. The changing rate of phase angle at high frequency k(f) was selected as the training sample for neural network. According to characteristics of EIS, changing rate of phase angle at high frequency k(f) and the classification results by neural network, the deterioration process of organic coating can be divided into three stages. It is concluded that changing rate of phase angle at high frequency k(f) is a helpful parameter and combined with neural network can be used for studying the deterioration process of organic coating. © 2013 by ESG. Source


Bing L.,PLA Military Transportation University | Bing L.,94277 Unit of the PLA | Xu A.,PLA Military Transportation University | Liang Y.,Tianjin University of Commerce | And 7 more authors.
International Journal of Electrochemical Science | Year: 2012

Some parameters are valuable in analyzing the organic coating performance such as coating resistance, coating capacitance, charge transfer resistance, double layer capacitance, while their extraction from EIS data is usually time-taking, furthermore, there may be some errors in calculating EIS data with equivalent circuit method. In this paper an attempt is made to introduce a new parameter obtained from the change rate of phase angle of Bode at high frequency in the electrochemical impedance spectroscopy (EIS) data. The new parameter (μ) then proved to be effective when evaluating the protective performance of a kind of grey organic coating used in vehicle equipment. The results indicated that this parameter has a good agreement with the phase angle at middle frequency of 10 Hz and the phase angle at high frequency of 10k Hz, respectively. It is concluded that the parameter can be used for fast evaluation of organic coatings in practical application. © 2012 by ESG. Source


Luo B.,94277 Unit of the PLA | Xia D.-H.,Tianjin University | Xia D.-H.,University of Alberta
Wuli Huaxue Xuebao/ Acta Physico - Chimica Sinica | Year: 2014

The effect of pH on the corrosion resistance of Alloy 800, one of the preferred nuclear steam generator tubing materials, was investigated using in-situ scanning electrochemical microscopy (SECM) and electrochemical impedance spectroscopy (EIS). The experimental results show that positive feedback is observed in the probe approach curve (PAC) in acidic chloride solutions, indicating that Alloy 800 is active in acidic solutions; the EIS at the corrosion potential in acidic solutions exhibits an intact capacitance arc. However, negative feedbacks are observed in the PAC in either neutral or basic chloride solutions, showing that Alloy 800 is self-passivated in these two solutions. The EIS plots at different anodic potentials show incomplete capacitance arcs, and the arc radius decreases with increasing potential, indicating that the corrosion resistance of the passive film decreases. The SECM images show that the surface reactivity increases (or the dissolution rate of the passive film increases) as the polarization potential increases from the corrosion potential to the positive direction; this is verified by an increased tip current. Someactive spotscan be seen on the SECM images in neutral or basic chloride solutions, which are possibly related to grain boundaries, triple points, and/or inclusions. © Editorial office of Acta Physico-Chimica Sinica. Source

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