hrpos.heartland.us Archives - Gen9 Genetics
Cold rolled steel products are often protected against corrosion by using antioxidant oils or aqueous nitrite-based lubricants. However, drum manufacturers who paint directly onto the steel surface without any preparation require a dry (oil-free) steel surface. Consequently, this type of material could easily suffer the effects of atmospheric corrosion during storage and transit if countermeasures are not taken. The rate of corrosion depends on several factors such as temperature, relative humidity, environmental pollutants and / or residues that remain on the surface of the steel (hygroscopic salts or iron fines). At Siderar, steel for drum making can be produced in different ways, which may involve an electrolytic cleaning process in the ECL (Electrolytic Cleaning Line) and box annealing (EBNER or HNX). Although these processes could help increase the cleanliness of the surface, they could also have an effect on the corrosiveness of the steel. In this work, the effect of the different process routes and the use of VCI (Volatile Corrosion Inhibitor) paper on the corrosion behavior of steel during storage is evaluated through laboratory experiments. The steel panels were analyzed by visual inspection and photographed based on storage time. The corrosion products were characterized by SEM / EDS (Scanning Electron Microscopy / Energy Dispersion Spectroscopy) and FTIR (Fourier Transform Infrared) spectroscopy. The results obtained made it possible to select a process route to reduce the appearance of atmospheric corrosion problems in cold rolled steel sheets.