Characterization of anodic films formed on copper in 0.1M borax solution

Ribotta, S.B.; orgia, L.F. La; Gassa, Liliana Mabel; Folquer, M. E.

doi:10.1016/j.jelechem.2008.09.015

Cited by 11 publications

(1 citation statement)

References 35 publications

(78 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to the reports [12,[47][48][49] in alkaline solution the corrosion layer of copper consists of tenorite (CuO), cuprite (Cu 2 O), as two stable oxides having black and reddish color, respectively, and copper hydroxide (Cu(OH) 2 ). Figure 6 presents X-ray diffraction patterns of the layers formed on Cu surface after exposure for 720 h in each of the concrete-pore model solutions.…”

Section: X-ray Diffraction Patternsmentioning

confidence: 99%

Copper Corrosion Behavior in Simulated Concrete-Pore Solutions

Bacelis

Véleva

Alpuche-Avilés

2020

Metals

View full text Add to dashboard Cite

The copper corrosion was studied for 30 days in two alkaline electrolytes: saturated Ca(OH)2 and cement extract, employed to simulate concrete-pore environments. Electrochemical Impedance Spectroscopy (EIS) and Cyclic Voltammetry were carried out at the open circuit potential (OCP), and potentiodynamic polarization (PDP) curves were performed for comparative purposes. Electrochemical current fluctuations, considered as electrochemical noise (EN), were employed as non-destructive methods. The tests revealed that sat. Ca(OH)2 is the less aggressive to the Cu surface, mainly because of the lower in one order pH. In consequence, the OCP values of Cu were more positive, the polarization resistance values were higher by one order of magnitude, and the anodic currents of Cu were lower than those in the cement extract. The analyzed EN indicated that the initial corrosion attacks on the Cu surface are quasi-uniform, resulting from the stationary persistent corrosion process occurring in both model solutions. XPS analysis and X-ray diffraction (XRD) patterns revealed that in sat. Ca(OH)2, a Cu2O/CuO corrosion layer was formed, which effectively protects the metallic Cu-surface. We present evidence for the sequential oxidation of Cu to the (+1) and (+2) species, its impact on the corrosion layer, and also its protective properties.

show abstract

Section: X-ray Diffraction Patternsmentioning

confidence: 99%