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ECN‐measurements at copper in artificial tap water – Investigation of anion‐effects
Author(s) -
Schmitt G.,
Plagemann P.,
Slavcheva E.
Publication year - 2001
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/1521-4176(200106)52:6<439::aid-maco439>3.0.co;2-4
Subject(s) - chemistry , tap water , bicarbonate , electrochemistry , chloride , copper , electrochemical noise , copper sulfate , nuclear chemistry , sulfate , inorganic chemistry , electrode , environmental engineering , organic chemistry , engineering
Electrochemical noise analysis was succesfully applied to study anion effects in the first 20 h starting period of copper corrosion in tap water. The influence of chloride, sulfate and bicarbonate as single anions and the interactions between them in three anion solutions were characterized in terms of standard deviation and PSD(I) data as well as interaction coefficients obtained from the evaluation of a set of experiments designed according to a statistical 2 3 ‐factorial plan. The results let conclude that sulfate has an activating and chloride a passivating effect. Bicarbonate seems to act as a buffering agent. It is obviously the combination of the presence of all three anions in a narrow range of concentration ratios which finally leads to pitting corrosion. The relevance of these results from short term exposure for the long term performance of copper in tap water and the likelihood of pitting corrosion should now be investigated in long term exposure tests.