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Structure of corrosion film formed on copper exposed to controlled corrosive environment

✍ Scribed by M. Reid; D. A. Tanner; S. Belochapkine; L. F. Garfias

Publisher: John Wiley and Sons
Year: 2009
Tongue: German
Weight: 201 KB
Volume: 60
Category: Article
ISSN: 0947-5117
DOI: 10.1002/maco.200805084

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✦ Synopsis

Abstract

This paper describes a transmission electron microscopy (TEM) investigation of copper coupons exposed to a corrosive mixed flowing gas environment (MFG). A focused ion beam (FIB) lift‐out technique was used to extract electron transparent specimens for TEM investigation. A duplex corrosion film comprising cuprite (Cu~2~O) and chalcocite (Cu~2~S) developed on the copper substrate. The oxide demonstrated a dense morphology with evidence of chlorine in the oxide layer showing that chlorine plays an important role in the corrosion of copper transforming the protective Cu~2~O layer to a non‐protective layer. The outer layer of the Cu~2~S demonstrated a porous morphology allowing easy penetration of water and gases.

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