Atmospheric corrosion of Ni-advanced weathering steels in marine atmospheres of moderate salinity

摘要

One conventional and three Ni-advanced weathering steels have been exposed for one year in two marine atmospheres of moderate aggressivity (30 and 75 mg Cl~-/m~2 d). The rusts generated have been analysed by polarised light optical microscopy, SEM, XRD, Raman spectroscopy and MOssbauer spectroscopy. The presence of high nickel (1-3% weight) contents in the steel composition leads to higher corrosion resistance in moderate marine atmospheres. The presence of nickel in the weathering steel also raises the proportion of nanophasic (superparamagnetic) goethite in the inner rust layer.