The same paint film can have different weather resistance depending on the climate when it is used. This situation is of great significance for the evaluation of the suitability of paint materials for the finishing of objects used in regions with very different climatic conditions.
Therefore, in order to obtain a complete idea of the protective properties of paint films, it is necessary to test the same paint material simultaneously at several stations located in different geographical areas.
We have studied the comparative stability of various white pigments on the atmosphere under different climatic conditions. Tests carried out on the two HNNJIK roof test stations in Moscow and Se-Vastopol proved that under the conditions of the southern oceanic climate (Se-Vastopol) the phenomenon of netting and cracking on the surface of the paint layer is almost impossible in all cases. Both appeared earlier than in Moscow. For example, the paint film of Moosko Chin dioxide did not show any signs of damage (except chalking), but the same paint film in Sevastopol showed signs of damage (net twisting) after the same time. and cracking). In this case the temperature of the air is high, the ratio of salt and ultraviolet rays to the air and the sharp change in temperature (day and night) play a major role. (Related instruments: air quality Detector)
Iron plates painted with white paint (zinc and white lead) corroded more severely in Moscow; this is explained by the harsh test conditions - the air contains various gases.
Experiments with various paint materials were also carried out at two other atmospheric stations of HNNNJIK, namely in Leningrad (maritime humid climate in the north) and in Batumi (subtropical marine climate with heavy rainfall). The test results prove that the paint material is damaged earlier in Batumi; chalking, cracking and rusting are faster. (Related instruments: aging Test Chamber)
To illustrate the stability of the various materials, it can be pointed out that, for example, Griffith enamel appeared to be more stable than oil-based enamel at both test stations, but emulsion enamel coatings appeared to be more stable in Batumi.
Various oil-based enamel coatings (linseed oil, hempseed oil, and other oils) quickly lost gloss, pulverized, and color cracked on the Batumi test station; ironware quickly rusted.
Films of oil-based paints (iron oxide mixed with natural cooked oils) are stable in Leningrad. However, the same coating film showed rust after two months in Batumi.
Thus, these experiments proved that the climatic conditions in Batumi were quite harsh compared with the conditions in Leningrad.
TNNN-4 has conducted research work on paint film tests under the climatic conditions of Moscow and Tashkent. In order to show the climatic conditions of Moscow and Tashkent, the meteorological data from March to September 1948 are cited (Table 31).
As shown in Table 31, the climate of Tashkent is characterized by very low relative air humidity, more sunny days and higher air temperature. In addition, March and April in Tashkent are characterized by sharp temperature changes (day and night), relative humidity and rainfall.
The test results of various coating films on these two stations can also confirm the influence of climate conditions on the weather resistance of film removal. It can be seen that in Tashkent, especially in March-April, chalking and corrosion of the underside started earlier and more severely than in Moscow.
The color cracking of the coating film is almost the same in Tashkent and Moscow. The weather resistance of certain paint films is reduced by half in Tashkent than in Moscow.
