Protective Properties of Calcareous Deposit Layer for Cathodically Polarized AH36 Steel in Natural Seawater

A calcareous deposit is a by-product of the cathodic polarization in seawater environments. This study presents the results of evaluating the anticorrosion and anti-macro-biofouling effectiveness of a calcareous deposit layer on the surface of the cathodically polarized AH36 structural steel in trop...

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Bibliographic Details
Published in:Coatings (Basel) 2024-05, Vol.14 (5), p.644
Main Authors: Nong, Quoc Quang, Dong, Van Kien, Nguyen, Van Trieu, Nguyen, Van Chi, Le, Hong Quan, Cao, Nhat Linh
Format: Article
Language:English
Subjects:
Aragonite
Biofouling
Brucite
Calcite crystals
Cathodic polarization
Cathodic protection
Corrosion and anti-corrosives
Corrosion potential
Corrosion prevention
Corrosion products
Electrodes
Magnesium hydroxide
Marine environment
Sea-water
Seawater
Spectrum analysis
Steel, Structural
Structural steels
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Summary:A calcareous deposit is a by-product of the cathodic polarization in seawater environments. This study presents the results of evaluating the anticorrosion and anti-macro-biofouling effectiveness of a calcareous deposit layer on the surface of the cathodically polarized AH36 structural steel in tropical seawater. The polarization is induced with initial current densities at which the calcareous deposit layer formed with both aragonite and brucite for 12 months continuously. The protective properties of the layer were compared with those of the passive layer from corrosion products under the same environmental conditions. The macro-biofouling in the tropical seawater is observed in the closed and open surfaces of the steel. The comparison of the anticorrosion property shows that, to some degree, the calcareous deposit layer contributes to surface passivation, as in the case of the corrosion product layer. In addition, the composition of the brucite and aragonite in the calcareous layer in the study plays a role as a macro-biofouling growth-limiting factor.
ISSN:2079-6412
2079-6412
DOI:10.3390/coatings14050644