期刊
MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION
卷 72, 期 1-2, 页码 300-307出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/maco.202011710
关键词
copper; corrosion; nuclear waste disposal; sulfide
资金
- Nuclear Waste Management Organization
- Svensk Karnbranslehantering AB
The study revealed that the growth of copper sulfide films is controlled by the supply of SH- from the solution, and the morphology of the film depends on the type and concentration of anions present in the solution.
In this paper, the properties of copper sulfide films formed both anodically and naturally in deaerated/anoxic aqueous sulfide and chloride solutions were investigated using a series of electrochemical and surface analytical techniques. A combination of cyclic voltammetric, corrosion potential (E-corr), and cathodic stripping voltammetric experiments showed that the sulfide film growth kinetics and film morphologies were controlled by the supply of SH- from the bulk solution to the copper surface. There was no passive barrier layer observed on the copper surface under either electrochemical or corrosion conditions. The film morphology was dependent on the type and concentration of anions (SH-, Cl-) present in the solution. Scanning electron microscopy on both surfaces and focused ion beam-cut cross-sections showed the growth of a thin, but porous, base layer of chalcocite (Cu2S) after short immersion periods (up to 2 hr) and the continuous growth of a much thicker crystalline outer deposit over longer immersion periods (>= 36 hr), suggesting a solution species transport-based film formation process and the formation of an ineffective thin barrier-type layer on copper.
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