Copper corrosion experiments under anoxic conditions

Kaija Ollila

Research output: Book/ReportReport

Abstract

This report gives results from the corrosion experiments with copper under anoxic conditions. The objective was to study whether hydrogen-evolving corrosion reaction could occur. Copper foil samples were exposed in deaerated deionized water in Erlenmeyer flasks in the glove box with inert atmosphere. Four corrosion experiments (Cu1, Cu2, Cu3 and Cu4) were started, as well as a reference test standing in air. Cu1 and Cu2 had gas tight seals, whereas Cu3 and Cu4 had palladium foils as hydrogen permeable enclosure. The test vessels were stored during the experiments in a closed stainless steel vessel to protect them from the trace oxygen of the gas atmosphere and light. After the reaction time of three and a half years, there were no visible changes in the copper surfaces in any of the tests in the glove box, in contrast the Cu surfaces looked shiny and unaltered. The Cu3 test was terminated after the reaction time of 746 days. The analysis of the Pd-membrane showed the presence of H2 in the test system. If the measured amount of 7.2?10-5 mol H2 was the result of formation of Cu2O this would correspond to a 200 nm thick corrosion layer. This was not in agreement with the measured layer thickness with SIMS, which was 6 ± 1 nm. A clear weight loss observed for the Cu3 test vessel throughout the test period suggests the evaporation of water through the epoxy sealing to the closed steel vessel. If this occurred, the anaerobic corrosion of steel surface in humid oxygen-free atmosphere could be a source of hydrogen. A similar weight loss was not observed for the parallel test (Cu4). The reference test standing in air showed visible development of corrosion products.
Original languageEnglish
Number of pages47
Publication statusPublished - 2013
MoE publication typeD4 Published development or research report or study

Publication series

SeriesSKB rapport
NumberR-13-34
ISSN1402-3091

Fingerprint

anoxic conditions
corrosion
copper
experiment
vessel
steel
hydrogen
atmosphere
test
oxygen
palladium
air
sealing
gas
evaporation
membrane
water

Cite this

Ollila, K. (2013). Copper corrosion experiments under anoxic conditions. SKB rapport, No. R-13-34
Ollila, Kaija. / Copper corrosion experiments under anoxic conditions. 2013. 47 p. (SKB rapport; No. R-13-34).
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Ollila, K 2013, Copper corrosion experiments under anoxic conditions. SKB rapport, no. R-13-34.

Copper corrosion experiments under anoxic conditions. / Ollila, Kaija.

2013. 47 p. (SKB rapport; No. R-13-34).

Research output: Book/ReportReport

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AU - Ollila, Kaija

N1 - Report ID 1393420

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AB - This report gives results from the corrosion experiments with copper under anoxic conditions. The objective was to study whether hydrogen-evolving corrosion reaction could occur. Copper foil samples were exposed in deaerated deionized water in Erlenmeyer flasks in the glove box with inert atmosphere. Four corrosion experiments (Cu1, Cu2, Cu3 and Cu4) were started, as well as a reference test standing in air. Cu1 and Cu2 had gas tight seals, whereas Cu3 and Cu4 had palladium foils as hydrogen permeable enclosure. The test vessels were stored during the experiments in a closed stainless steel vessel to protect them from the trace oxygen of the gas atmosphere and light. After the reaction time of three and a half years, there were no visible changes in the copper surfaces in any of the tests in the glove box, in contrast the Cu surfaces looked shiny and unaltered. The Cu3 test was terminated after the reaction time of 746 days. The analysis of the Pd-membrane showed the presence of H2 in the test system. If the measured amount of 7.2?10-5 mol H2 was the result of formation of Cu2O this would correspond to a 200 nm thick corrosion layer. This was not in agreement with the measured layer thickness with SIMS, which was 6 ± 1 nm. A clear weight loss observed for the Cu3 test vessel throughout the test period suggests the evaporation of water through the epoxy sealing to the closed steel vessel. If this occurred, the anaerobic corrosion of steel surface in humid oxygen-free atmosphere could be a source of hydrogen. A similar weight loss was not observed for the parallel test (Cu4). The reference test standing in air showed visible development of corrosion products.

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Ollila K. Copper corrosion experiments under anoxic conditions. 2013. 47 p. (SKB rapport; No. R-13-34).