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PHYSICAL DAMAGE FORMATION ON AUTOMOTIVE FINISHES DUE TO ACIDIC REAGENT EXPOSURE
Citation:
White, D., R. Fornas, R. Gilbert, A. Speer, AND J. Spence. PHYSICAL DAMAGE FORMATION ON AUTOMOTIVE FINISHES DUE TO ACIDIC REAGENT EXPOSURE. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/A-92/240 (NTIS PB93120962).
Description:
Several types of automotive finishes with clear coatings were exposed to drops of acidic reagents at 54 degrees C. urface damage was examined using visual observations, reflection optical microscopy, SEM, EDS, and profilometry. eflection microscopy was the most useful technique for observing surface damage. canning electron microscopy provided sulfur mappings through the use of an EDS attachment. hamber dew with pH level of 3.4 created in a smog chamber designed to simulate real environmental conditions was highly detrimental to the finishes with damage concentrated in a ring with a diameter less than the original drop size. he form of this damage suggests a free energy minimization process favoring oncentration of the damaging reagent at the edge of the evaporating drop where stable nuclei are thought to form. ontinued heating of the samples after the drop evaporation resulted in damage that increased with time, with most of the visual damage located underneath material deposited from the evaporated drop.
