Corrosion behaviour of copper under biotic and abiotic conditions in anoxic ground water: electrochemical study

Corrosion and scale studies of copper used in Moroccan industrial cooling water systems

“…Figure 2b shows the XRD analysis of the copper surface after 24 h of immersion in make-up water at 323 K. It is shown that the formed layer of corrosion products was composed of copper oxides such as cuprites (Cu 2 O). The same results were found by other authors when they studied the copper corrosion under biotic and abiotic conditions in anoxic ground water (Huttunen-Saarivirta et al 2016). In fact, their experiments were carried out in acid-washed ethanol (70%) sterilized vessels of the volume of 12 l that were essentially gas tight.…”

“…It is also remarked the appearance of a sulfur peak (0.64 wt%) which can be indicated the development of sulfate-reducing bacteria, such as found by Enning et al when they studied the marine sulfatereducing bacteria on iron corrosion under electro-conductive biogenic mineral crust (Enning et al 2012). In addition, the development of Cu 2 S is the primary surface process on copper specimens where its corrosion protection properties improve by bio-film growth, which becomes less sensitive to Cl -attack (Huttunen-Saarivirta et al 2016). Figure 2b shows the XRD analysis of the copper surface after 24 h of immersion in make-up water at 323 K. It is shown that the formed layer of corrosion products was composed of copper oxides such as cuprites (Cu 2 O).…”

“…Prior to the experiments, the ethanol-sterilized specimens and the electrodes were placed aseptically in the vessels, which were first flushed with N 2 to remove oxygen and then filled with anoxic artificial groundwater. This study included two vessels: one was made biotic by adding 50 ml of enrichment culture of sulfate-reducing bacteria (SRB) and the other abiotic, which was tested as such (Huttunen-Saarivirta et al 2016). Indeed, the accumulation of Cu 2 O on the copper surfaces either alone (Eriksen et al 1989;Bojinov et al 2010;Bech-Nielsen et al 2002;Trachli et al 2002;Kosec et al 2015;Sherif and Park 2005;Merkel and Pehkonen 2006) or with some CuCl (Merkel and Pehkonen 2006;Kear et al 2004) was frequently reported with another suggestion (Kosec et al 2015;Sherif and Park 2005;Merkel and Pehkonen 2006) that the formed CuCl may react more late with water to introduce Cu 2 O.…”

“…They found that under abiotic conditions, the passivity breakdown by Cl -ions resulted in the localized type of attack detected on the surfaces. This finding is the probable reason for an essentially higher corrosion rate than in the biotic system (Huttunen-Saarivirta et al 2016). For this, we have studied the influence of chloride and sulfate ions on the scale formation, such as presented in Fig.…”

State of the Surface of Antibacterial Copper in Phosphate Buffered Saline

“…17 The interactions of copper oxides with complexing ions such as Cl − are rather complicated. 7,[23][24][25][26] Consequences of such interaction may be a localized attack, with loss of the oxide film. [27][28][29] Previous experimental studies repetitively showed that the presence of Cl − in the electrolyte leads to pitting corrosion, and thus instability of the oxide film, resulting in CuCl formation.…”