КОРОЗІЙНІ ПОШКОДЖЕННЯ АЛЮМІНІЄВИХ СПЛАВІВ В КОНСТРУКЦІЯХ ЛІТАКА

The zones of corrosive damage to the patrol aircraft R-3, found during the decade of its operation, are shown.Examples of damage to aircraft structures due to corrosion of metals under operating conditions are presented. The negative impact on the design of the aircraft general  (surface) corrosion, intergranular corrosion and exfoliation corrosion, , stress corrosion cracking, crevice corrosion and its type - corrosion under insulation, filiform corrosion, pitting corrosion.It is shown that general   corrosion affects the structure of the aircraft less. It consumes metal evenly and relatively slowly.Intergranular corrosion is usually a particularly unpleasant form of corrosion. This type of corrosion can be difficult to detect. Very strong intergranular corrosion can sometimes lead to detachment of the metal surface. In extreme cases, the edges of the affected area resemble divided pages of a dampened book that is swollen and beginning to open.Another one of the most damaging forms of corrosion is stress corrosion cracking.Crevice corrosion is a very common type found on airplanes. A variation of crevice corrosion is corrosion under insulation. Corrosion under insulation is a particularly severe form of localized corrosion.Pitting corrosion is considered more dangerous than uniform corrosion damage, because it is harder to predict and detect.Filiform corrosion, gives rise to a number of small worms under the paint surface. Often they can be seen on surfaces that have been improperly chemically treated before painting.The current approach to dealing with corrosion is to remove it, once it is found, repair the corroded structure or replace the component. This is expensive in terms of increasing maintenance time and reducing the availability of aircraft. It is advisable to treat compounds with corrosion in order to prevent corrosion and leave it in place until access to the areas affected by corrosion during scheduled maintenance, the duration of which depends on the technical condition of the aircraft, is simplified.Obtaining the most accurate information about the actually possible periods between the scheduled maintenance of aircraft is an important task that is faced by researchers working in this field of activity.