Abstract
It is well known that the cathodic protection of structures in seawater is accompanied by the formation of calcareous deposits on them. In current study, we consider the physicochemical modelling of the formation of the deposit composition against cathode current density in seawater. The reliability of the model representations is confirmed by direct experiments. The work also studied the protective properties of the deposits with a different composition for low-alloy steels in natural sea water. It has been shown that the deposits of pure Mg(OH)2and the deposits of CaCO3+ Mg(OH)2had better protective ability against corrosion than the deposits of pure CaCO3. However, the deposits of Mg(OH)2dissolved faster than the deposits of CaCO3and CaCO3+ Mg(OH)2. Theoretical concepts and experiments on the laws governing the formation of the deposits and their protective properties are in complete agreement with each other. This allows to use the obtained patterns in the cathodic protection of structures in sea water using solar panels, forming standard deviations with predetermined protective properties in the daytime.
Highlights
Seawater is a very aggressive corrosive medium for various metal structures, depending on the nature of the metal, the chemical and microbiological composition of seawater and its physicochemical characteristics
The accumulated centuries-old experience of experimental study of corrosion losses and numerous theoretical works still do not allow understanding the subtleties of the process of metal corrosion in natural sea water [1,2,3]
Most researchers believe that the most effective protection of low-alloy steels in seawater is cathodic protection, the essence of which lies in imposing an external cathode current on the protected product
Summary
Seawater is a very aggressive corrosive medium for various metal structures, depending on the nature of the metal, the chemical and microbiological composition of seawater and its physicochemical characteristics. Elucidation of the mechanism for the deposition of the deposits and their protective properties is of particular importance when used in cathodic protection as a source of protective current for solar panels. The peculiarity of this kind of protection is that in the daytime, in the presence of a protective current, it is necessary to form a salt coating of such a quality that, in the dark of the day, when there is no protective current, would provide effective protection of the metal against destruction due to corrosion. To control the quality of such deposits, a deep understanding of the physicochemical processes that accompany the formation and dissolution of the coatings of deposits is required, which is the aim of this work
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