Comparative assessment of the protective effectiveness of standard and nanomodified PF-115 coatings under marine service conditions

The operation of metallic structures of ships and coastal facilities in marine atmospheric conditions is accompanied by intensive exposure to corrosion-active factors, including high humidity, salt-laden air, temperature fluctuations, and ultraviolet radiation. These effects lead to accelerated degradation of protective coatings and a reduction in the service life of metal structures. One of the most widely used paint and varnish materials for anticorrosion protection is PF-115 enamel; however, its operational stability in aggressive marine environments is limited, which necessitates improving its protective performance.
The aim of this study is a comparative assessment of the protective properties of standard and nanomodified PF-115 coatings under conditions simulating marine service. The research objectives included analysis of the coating formulations, accelerated corrosion testing in a salt spray chamber, cyclic climatic testing under variable humidity and temperature, adhesion evaluation, and microstructural analysis of the coatings. Zinc oxide and titanium dioxide nanoparticles with particle sizes of 20–100 nm were used as nanomodifiers at a total content of up to 3 wt.% of the dry matter. The results demonstrate that the incorporation of nanodispersed additives reduces the corrosion rate, increases the number of climatic cycles before the onset of coating degradation by 1.8–2 times, maintains adhesion at 4.0–4.8 points after 60 test cycles, and prevents the formation of localized underfilm corrosion.
The findings confirm the enhancement of barrier properties and operational reliability of the nanomodified PF-115 coating and indicate its suitability for protecting ship and coastal metal structures under marine environmental conditions.

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