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Journal of Chinese Society for Corrosion and protection  2016, Vol. 36 Issue (4): 375-380    DOI: 10.11902/1005.4537.2015.162
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Influence of Short-term Storage on Corrosion Behavior of Copper
Lin FENG,Yanhua WANG(),Lian ZHONG,Jia WANG,Aijiao LI,Xiaoxiao JIN
Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
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Abstract  

The influence of short-term storage in dry atmosphere on the corrosion behavior of copper was investigated by means of potentiodynamic polarization, electrochemical impedance spectroscopy, capacitance measurement and array electrode technique. It was found that the surface film on copper presented a p-type semiconductor structure, and the carrier concentration decreased after short-term storage. At the same time, the corrosion potential increased, the corrosion current density decreased, and the surface film inhibited both the cathodic and anodic process. Copper displayed the typical characteristics of localized corrosion beneath a NaCl droplet. After storage, the wet-ability, the corrosion activity as well as the overall average corrosion intensity are reduced, but the local corrosion intensity enhanced.

Key words:  array electrode      short-term storage      copper      mott-schottky plot      droplet      corrosion     

Cite this article: 

Lin FENG,Yanhua WANG,Lian ZHONG,Jia WANG,Aijiao LI,Xiaoxiao JIN. Influence of Short-term Storage on Corrosion Behavior of Copper. Journal of Chinese Society for Corrosion and protection, 2016, 36(4): 375-380.

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https://www.jcscp.org/EN/10.11902/1005.4537.2015.162     OR     https://www.jcscp.org/EN/Y2016/V36/I4/375

Fig.1  Mott-Schottky plots of fresh and passivated samples in 0.05 mol/L Na2SO4 solution
Sample a b N / cm-3 Efb / V
Fresh 2.09×1014 -9.41×1015 3.21×1019 -3.45×10-3
Passivated 2.71×1014 -1.52×1016 1.98×1019 -7.92×10-3
Table 1  Electrochemical parameters of fresh and passivated samples in 0.05 mol/L Na2SO4 solution
Fig.2  Potentiodynamic polarization curves (a) and electrochemical impedance spectra (b) of fresh and passivated samples in 0.6 mol/L NaCl solution
Fig.3  Galvanic current distributions on the surfaces of fresh (a, c, e, g) and passivated (b, d, f, h) WBE electrodes after corrosion under the droplet of 25 μL 0.6 mol/L NaCl solution for 2 h (a, b), 6 h (c, d), 8 h (e, f) and 12 h (g, h)
Fig.4  Variations of iAverage (a), IAverage (b), Ia,max (c) and local corrosion intensity index LCII (d) of fresh and passivated samples with corrosion time
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