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Investigation of atmospheric corrosion with use of permanent corrosion stations

Barszcz P.

Prace Naukowe Instytutu Technicznego Wojsk Lotniczych

2012

nr 30

25-44

Field tests of atmospheric corrosion [7, 14, 15] are understood as investigation that are carried out in the Earth atmosphere at the ambient temperature in order to determine corrosion resistance of metals and pollution of environment by corrosion products, efficiency of corrosion protection or corrosion aggressiveness of environment [9, 11]. The investigation dedicated to prolongation of the technical service time of aircrafts as well implementation of their operation according to their actual technical condition are closely connected to investigation of corrosion processes under natural atmospheric conditions where specimens of materials are exposed to the impact of ambient factors and periodically subjected to tests that assume visual inspection, scheduled determination of weight and volume loss due to corrosion, appearance of specimens and alteration of their physical parameters [4]. Investigation results are obtained as measurements of weight and thickness of corroded specimens, photographs of specimen surfaces after withdrawing them back from the corrosion stations and removing corrosion products. On the basis of information acquired from investigations on corrosion it is possible to calculate parameters that are specific for the corrosion process that takes place within the region where a permanent corrosion station is located. The calculated parameters have been sourced from standards that are effective in Poland and worldwide [5, 6, 8, 10] but own specifications have also been developed based on the gained experience (Table 3). The research process involves also monitoring of atmospheric conditions that exist on the area where corrosion specimens are exposed [4]. Information related to atmospheric conditions is sourced from the Hydrometeorological Centre of Polish Army along with information that is published on the Internet by the Inspectorate of Environmental Protection. These information that reflect the atmospheric conditions make it possible to seek for the correlation between the parameters that are specific for the corrosion process and meteorological conditions.