Intergranular erosion corrosion of pure copper tube in flowing NaCl solution

We investigated the erosion corrosion behavior of a commercial copper tube in 1 wt% NaCl solution using a self-built loop apparatus, and revealed effects of flow velocity on corrosion layer evolution that explains the flow velocity dependent corrosion rate of copper tubes in application. Furthermore...

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Published in:Corrosion science 2022-06, Vol.201, p.110304, Article 110304
Main Authors: Wu, Lei, Ma, Aili, Zhang, Lianmin, Zheng, Yugui
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description We investigated the erosion corrosion behavior of a commercial copper tube in 1 wt% NaCl solution using a self-built loop apparatus, and revealed effects of flow velocity on corrosion layer evolution that explains the flow velocity dependent corrosion rate of copper tubes in application. Furthermore, the intergranular erosion corrosion forms the detached and partially oxidized copper grains with nut structure. From core to shell, the compositions are supposed to be copper, copper-based oxygen solid solution, Cu2O with oxygen vacancies, Cu2O, and Cu2O with copper vacancies. These findings provide deepened understanding of erosion corrosion behavior of copper and copper alloys. [Display omitted] •Two critical velocities exist corresponding to stripping of outer and inner layers.•The layer of oxidized copper grains instead of a continuous Cu2O film is observed.•A nut structure with a copper core and a cuprous oxide shell is observed.•Intergranular erosion corrosion mechanism is proposed for copper in flowing media.
doi_str_mv 10.1016/j.corsci.2022.110304
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subjects Copper
Copper base alloys
Copper oxides
Corrosion
Corrosion effects
Corrosion rate
EPMA
Erosion
Erosion-corrosion
Flow velocity
Intergranular corrosion
Oxygen
Sodium chloride
Solid solutions
Tubes
Vacancies
XPS
title Intergranular erosion corrosion of pure copper tube in flowing NaCl solution
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