Page 681 - Handbook of Thermal Analysis of Construction Materials

Section 3.0 - Coatings 649

non-isothermal data can be calculated. From the results of the study, Neag,
et al., [22] concluded that the results from both the TG and oven studies
showed that the time-to-failure of the formulation increased with increasing
additive level. Film blackening obtained from the oven studies corresponds
to a rapid change in weight after reaching about 2.5% weight loss. It was
also found that the onset temperature and the weight loss derivative peak
correlate well with the time to degradation in forced air ovens. Furthermore,
the predicted time-to-failure values obtained using the TTS method were in
excellent agreement with failure times obtained from oven-aging studies.

Figure 12. TG decomposition profile. (Reprinted with permission.) [22]

3.4 Inorganic Coatings

For inorganic coatings, thermoanalytical techniques can similarly
be used to measure purity of raw materials including verification of the
origin of some minerals, evaluation of thermal stability, estimation of the
heats of reaction, determination of the nature of the reaction, establishment
of processing temperatures, comparison of adhesion energies, and, by
phase diagram determination, selection of a composition for the final