Destruction of Epoxy Coatings under the Influence of Sodium Chloride Water Solutions

Abstract

The paper discusses the influence of ageing with sodium chloride water (3, 10, 20%) solutions on the destruction of epoxy coatings. The immersion of coatings in these media has caused the destruction of the coating surface in the form of cracks and increased roughness proportionally to the immersion period. The degree of surface destruction has increased along with the concentration of sodium chloride solution. Also, on the other hand, the inside structure of the coating has been subjected to changes that have occurred in the form of porosity growing with an increase in the ageing period.

The Influence of Battery Acid on the Destruction of Acrylic Coatings of Car Bodies

“…Coating life predicting is also a complicated question, since the complexity of the ENVIRONMENT-COATING-SUBSTRATE system results in a gap of an appropriate theoretical basis, as the component parts of the system and the relationships between them undergo constant changes. The changes concern the operational environment's aggressiveness as well as kinds of materials used for polymer coatings and also for substrates [6][7][8][9][10][11][12][13].…”

“…It should be stressed that the simultaneous action of aggressive media absorbed by the coatings and mechanical factors may promote the propagation of cracks in their structure [7,46]. Moreover, as a consequence of aggressive media absorption, the coating's surface energy decreases, which also causes a decrease of the mechanical strength of the coating [3,9,16].…”