CaCO3 scale deposition on copper metal surface; effect of morphology, size and area of contact under the influence of EDTA

An analysis of a culturable corrosive bacterial community in water samples from a cooling tower was performed using traditional cultivation techniques and its identification based on 16S rRNA gene sequence. Seven aerobic bacterial species were identified: Pseudomonas putida ARTYP1, Pseudomonas aeruginosa ARTYP2, Massilia timonae ARTYP3, Massilia albidiflava ARTYP4, Pseudomonas mosselii ARTYP5, Massilia sp. ARTYP6, and Pseudomonas sp. ARTYP7. Although some of these species have commonly been observed and reported in biocorrosion studies, the genus Massilia is identified for the first time in water from a cooling tower. The biocorrosion behaviour of copper metal by the new species Massilia timonae ARTYP3 was selected for further investigation using a weight loss method, as well as electrochemical and surface analysis techniques (SEM, AFM, and FTIR). In contrast with an uninoculated system, thin bacterial biofilms and pitting corrosion were observed on the copper metal surface in the presence of M. timonae. The use of a biocide, bronopol, inhibited the formation of biofilm and pitting corrosion on the copper metal surface.

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Simulation and Surface Topology of Activity of Pyrazoloquinoline Derivatives as Corrosion Inhibitor on the Copper Surfaces

10.21203/rs.3.rs-199588/v1 ◽

2021 ◽

Author(s):

Razieh Razavi ◽

Mahboobeh Zahedifar ◽

Sayed Ali Ahmadi

Keyword(s):

Metal Surface ◽

Surface Density ◽

Profile Analysis ◽

Surface Topology ◽

Bond Critical Point ◽

Interaction Energies ◽

Copper Metal ◽

Chemical Thermodynamic ◽

Copper Surfaces ◽

Water Media

Abstract In the present study, interactions of pyrazolo [3,4-b]quinoline-3,5-dione derivatives on copper metal surface were considered using B3LYP/6-311 + + g(d,p) in water media and also interaction energies were simulated for all the chemical coordination’s of pyrazoloquinoline derivatives compounds. Moreover the original and novel results revealed that in all the chemical side effects and cases, pyrazoloquinoline derivatives compounds were located on the Cu metal surface. This shows that the most important desired direction is where the concentrated numbers of electron donor active atoms of inhibitor molecules interacted with the Cu metal surface atom. Furthermore the chemical Thermodynamic parameters were estimated for example: ∆G of chemical inhibitor complexes with the Cu metal surface. Density of the electron profile analysis and chemical electrostatic potential of nuclear charges in the molecule were applied to consider the nature of a number of probable interactions between Cu metal surface and inhibitors in terms of bond critical point (BCP). Finally chemical electronics parameters showed that the OH and NO2 pyrazoloquinoline derivatives have best interaction in chemical and surface media.

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