Correlation between the fouling of different crystal calcium carbonate and Fe2O3 corrosion on heat exchanger surface

As fouling and corrosion often occur in the heat exchanger simultaneously, it is difficult to research the two problems separately. In this work, the adsorption behaviour of Fe 2 O 3 /Fe, calcite and aragonite on the corroded surface were studied by molecular dynamics and the corrosion-fouling exper...

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Bibliographic Details
Published in:Molecular simulation 2021-06, Vol.47 (9), p.748-761
Main Authors: Ren, Lu, Qiu, Gui-hui, Yu, Hong-ying, Zhou, Peng, Shoji, Tetsuo, Li, Ning-ning, Xu, Jian
Format: Article
Language:English
Subjects:
Adsorption
adsorption process
Aragonite
Calcite
Calcium carbonate
Corrosion
Crystallization
Ferric oxide
Fouling
Heat exchangers
Molecular dynamics
Nucleation
Substrates
Surface chemistry
α-fe
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Summary:As fouling and corrosion often occur in the heat exchanger simultaneously, it is difficult to research the two problems separately. In this work, the adsorption behaviour of Fe 2 O 3 /Fe, calcite and aragonite on the corroded surface were studied by molecular dynamics and the corrosion-fouling experiment. The results prove that the parameters of the Fe(0 0 1) surface can be affected by the Fe 2 O 3 corrosion. The interaction energy between the calcium carbonate and substrate shows that both Fe and Fe 2 O 3 surfaces have certain adsorption effect on calcium carbonate crystallisation fouling. In addition, the adsorption effect of Fe 2 O 3 (0 0 1) on calcite during the fouling induction period is three times than that on the Fe(0 0 1) surface. Although the aragonite is prone to adhering to the non-corroded substrate, the binding ability between aragonite and substrate is weaker than that between calcite and substrate. Moreover, according to the corrosion-fouling experiment, the precipitate on the surface of the non-corroded is mainly calcite-phase calcium carbonate mingled with the acicular aragonite-phase calcium carbonate. The mass gain of fouling increases with the increasing corrosion of the substrate. The work provides evidence that the fouling nucleation of the calcium carbonate can be influenced by the corroded surface.
ISSN:0892-7022
1029-0435
DOI:10.1080/08927022.2021.1923709