Weathering steel in coastal Atmosphere

摘要

Low-alloy weathering steels resistant to SOxpollution show poor performance in environments where airbornesalinity is high. Recent researches on rust and weathering steels,therefore, have been focused on the rusting mechanism in thepresence of chloride and development of new steels and coatingsfor the use in marine/coastal environments. In the paper discussionand literature review are given for the following subjects: 1)tolerable limit of airborne salinity level for the use of uncoatedweathering steels in infrastructure, 2) related case study of flakerusting on bridges in coastal area, 3) thermochemical aspect ofrusting in chloride environments, 4) crystal structure of iron rustin high salinity, 4) electrochemical reaction of rust and its catalyticproperties in chloride media, 5) protective nature of rust ofweathering steels, and 6) quality evaluation (or stabilization) ofrust on weathering steels.