Abstract
Renovation coatings of car bodies undergo destruction under the influence of operational factors. Like ultraviolet radiation, erosion, and aggressive media (among others, battery acid). This article concerns the evaluation of the influence of battery acid on the destruction of acrylic coatings previously non-aged, as well as aged climatically for 2 years. Ageing of the coatings with battery acid contributed to a degradation increase of their chemical structure. It was supported by a considerable increase in the polar component of surface free energy (SFE) of the coatings. In the case of prior climate ageing, the increase in the polar component was even higher. Moreover, the coating’s ability to absorb battery acid increased, which induced blistering. The DSC method revealed that the action of battery acid caused more intense oxidation of coating material, and as a result, the brittleness increased, leading to chipping of the coating surface layers. This led to the increase in surface roughness, measured using an interferometric method. The coatings previously climatically aged for 2 years presented higher values of surface roughness parameters than the non-aged ones. The increase in the surface roughness contributed to a substantial decrease in the gloss of coatings. A sharp difference in colour escalating with the lengthening of the ageing period was also observed using the spectrophotometric method.
Highlights
Acrylic coatings have found a widespread and sustained application as decorativeprotective coatings of modern car bodies
IR spectroscopic investigations (FTIR) were carried out in order to evaluate the chemical destruction of acrylic coatings aged at the climatic station for the period of 2 years
Climatic ageing leads to the chipping of filler and pigment particles from the surface of the coatings (Table 1c)
Summary
Acrylic coatings have found a widespread and sustained application as decorativeprotective coatings of modern car bodies. Scientific development in the area of paints and varnishes for coatings of car bodies is presently focused on environmentally friendly coating materials. For this reason, volatile organic compounds (VOC) have been eliminated (or significantly reduced) from paint and lacquer formulas in the last 10 years. Conducting complete and long-lasting operational examinations on representative samples of coatings, which may last even 10 to 15 years, has no substantive grounds. What concerns the currently used new generations of coatings (nanocoatings especially) is necessary to test them in accelerated mode, enabling their quick operational life prediction in expected conditions [1,2,3,4,5,6]
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