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Influence of aqueous sodium chloride solutions on operational properties of epoxy coatings
 
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Online publication date: 2022-10-02
 
 
Publication date: 2022-10-02
 
 
Eksploatacja i Niezawodność – Maintenance and Reliability 2022;24(4):629-640
 
HIGHLIGHTS
  • A permanent decrease in the operational properties of the brine aged coatings was shown.
  • FTIR and DSC studies have documented the degradation of the brine aged epoxy material.
  • A significant growth of destruction and roughness of the brine aged coatings was found.
  • Silver crackings were revealed on the surface of the coatings aged for 1008 h - 1680 h.
  • An original, universal method of multi-criteria studies of coating properties was used.
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ABSTRACT
The main goal of the research presented in the article is to assess the impact of the destruction (degradation) of epoxy coatings, caused by the influence of a 25% aqueous solution of sodium chloride (brine), on the operational properties that determine the coatings reliability (durability). Samples of two-layer epoxy coatings (obtained from powder paints) were aged by immersing them in brine for a maximum period of 1680 h. The following criteria were used to assess the operational properties of the coatings: thickness, roughness and surface morphology, hardness, water absorption (mass increase), surface free energy. The FTIR and DSC tests performed showed a progressive development of the oxidation processes of the epoxy with the ageing period. The long-term impact of the brine resulted in the destruction of the coatings in the form of: craters, grooves, microcracks, including silver cracks. The contact of the coatings with brine also increased their: surface roughness (Ra, Rz, Rmax), thickness, mass, surface free energy, and decreased hardness and heat resistance.
 
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eISSN:2956-3860
ISSN:1507-2711
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