Influence of Chloride Deposition on Corrosion Products

The article deals with the influence of atmospheric corrosion and corrosive environment factors on the development of a protective layer of corrosion products of the weathering steel. The main aggressive factors of atmosphere that can negatively affect corrosion rate and the development of corrosion products on the steel surface include sulfates and chlorides. The development of the protective layer of corrosion products on bridge structures designed from weathering steel is monitored by program of experimental atmospheric corrosion tests. Exposed specimens on selected bridges allow to determine the relationship between the thickness of the layer of corrosion products and corrosion losses depending on the time of exposure and local environmental conditions. For the evaluation of protective properties of corrosion layer of the weathering steel indexes PAI is applied. This article presents the part of results of field experimental atmospheric corrosion tests for selected bridge structures in Ostrava. The influence of the amount of chlorides forming insoluble compounds in corrosion products on the protective properties of corrosion layers weathering steel is monitored for these bridges.