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Copper corrosion in distribution systems: evaluation of a homogeneous Cu2O film and a natural corrosion scale as corrosion inhibitors
The aim of the work is to asses the performance of different corrosion scales as effective copper corrosion inhibitors using synthetic waters and distribution system waters. The major objective of the study was to evaluate the stability of an artificially synthesized Cu2O film and naturally formed heterogeneous corrosion scales under the influence of a number of synthetic and real waters, using Electrochemical Impedance Spectroscopy (EIS). Cu2O coatings were synthesized by using a special flame aerosol deposition process. Based upon the EIS data, conclusions regarding the stability of the different scales under typical water quality conditions, (which are commonly encountered in water distribution systems), are drawn. The performance and the stability of the Cu2O scale are strongly dependent upon the pH, the DIC and the chloride concentrations. At pH 7, the coating was found to be very stable at a DIC to chloride ratio in the vicinity of 2. However, at pH 8.5, due to the shift in the DIC speciation toward the CO3(2-) and the consequent development of small pockets of high H(+) concentration, the performance of the Cu2O coating deteriorated very fast. Under the influence of real waters, the performance of the Cu2O coating was found to be comparable to that of the two naturally developed scales only certain conditions. Although the instantaneous corrosion rates are strongly dependent on several water quality parameters and inorganic and organic species, the deterioration of the Cu2O film upon exposure at a given pH seems to depend most strongly on the DIC to chloride ratio. The study by no means answers all the questions regarding film stability in distribution systems, though it provides an excellent foundation for additional studies in this critical area of research. The performance of other Cu(I) and Cu(II) mineral phases that have been identified in the water distribution corrosion scales needs to be quantified under the influence of a variety of real and synthetic waters. The effect of temperature, hydrodynamic shear and disinfectant residuals on the solubility, stability and morphology of these scales need to be ascertained in order to optimize the performance of the films, when they are exposed to different water quality conditions.
Copper corrosion in distribution systems: evaluation of a homogeneous Cu2O film and a natural corrosion scale as corrosion inhibitors
The aim of the work is to asses the performance of different corrosion scales as effective copper corrosion inhibitors using synthetic waters and distribution system waters. The major objective of the study was to evaluate the stability of an artificially synthesized Cu2O film and naturally formed heterogeneous corrosion scales under the influence of a number of synthetic and real waters, using Electrochemical Impedance Spectroscopy (EIS). Cu2O coatings were synthesized by using a special flame aerosol deposition process. Based upon the EIS data, conclusions regarding the stability of the different scales under typical water quality conditions, (which are commonly encountered in water distribution systems), are drawn. The performance and the stability of the Cu2O scale are strongly dependent upon the pH, the DIC and the chloride concentrations. At pH 7, the coating was found to be very stable at a DIC to chloride ratio in the vicinity of 2. However, at pH 8.5, due to the shift in the DIC speciation toward the CO3(2-) and the consequent development of small pockets of high H(+) concentration, the performance of the Cu2O coating deteriorated very fast. Under the influence of real waters, the performance of the Cu2O coating was found to be comparable to that of the two naturally developed scales only certain conditions. Although the instantaneous corrosion rates are strongly dependent on several water quality parameters and inorganic and organic species, the deterioration of the Cu2O film upon exposure at a given pH seems to depend most strongly on the DIC to chloride ratio. The study by no means answers all the questions regarding film stability in distribution systems, though it provides an excellent foundation for additional studies in this critical area of research. The performance of other Cu(I) and Cu(II) mineral phases that have been identified in the water distribution corrosion scales needs to be quantified under the influence of a variety of real and synthetic waters. The effect of temperature, hydrodynamic shear and disinfectant residuals on the solubility, stability and morphology of these scales need to be ascertained in order to optimize the performance of the films, when they are exposed to different water quality conditions.
Copper corrosion in distribution systems: evaluation of a homogeneous Cu2O film and a natural corrosion scale as corrosion inhibitors
Kupferkorrosion in Verteilungssystemen: Bewertung einer homogenen Cu2O-Schicht und eines natürlichen Korrosionszunders als Korrosionsinhibitoren
Palit, A. (author) / Pehkonen, S.O. (author)
Corrosion Science ; 42 ; 1801-1822
2000
22 Seiten, 9 Bilder, 9 Tabellen, 34 Quellen
Article (Journal)
English
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