Evaluation of the rate of ageing of an epoxide coating from changes in their strength properties
Polimery 1996, No 5, 297
The effect of ageing under conditions of UV radiation, dry climate and immersion in 10% water solution of NaCl on the changes in tensile strength characteristics of epoxide coating was investigated. Changes in the following properties were determined: maximum tensile strength (δz), breaking strength (δr), relative elongation atbreak (εz) and Young's modulus (E). The highest destruction of the coating was due to UV radiation causing an intensive deterioration of the δz and δr values.This phenomenon is connected with the formation of microcracks in epoxide material due to breaking of chemical bonds. This fact was confirmed by an analysis of IR spectra, which indicated that ageing was accompanied by oxidation. Ageing in 10% water solution of NaCl caused plasticization of the coating resulting in a more than threefold increase in the relative elongationat break after ageing in that medium.
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