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Weathering structural steels corrosion in atmospheres of various degrees of pollution in Romania
Author(s) -
Damian L.,
Fako R.
Publication year - 2000
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/1521-4176(200008)51:8<574::aid-maco574>3.0.co;2-0
Subject(s) - weathering , weathering steel , corrosion , metallurgy , pollution , atmosphere (unit) , environmental science , materials science , geology , geochemistry , geography , meteorology , ecology , biology
The atmospheric corrosion behaviour of CORTEN weathering steel grade in various atmospheric environments in Romania is presented. The researches were accomplished on two types of weathering structural steels exposed 20 years in urban‐industrial and rural environments (characterised according to ISO 8565 and ISO 9223 as corrosivity classes C5 and C1). The experimental results emphasise that corrosion rate stabilised at 0.08–0.10 mm/year after about 10 exposure years, and electronic microscope examination showed that corrosion products layer enriches in alloying elements (Cr, Ni, P, Cu) and in stable crystalline products like Fe 2 O 3 and α‐FeOOH that passivate steel. Passive layer compactness, studied by its moistening capacity, increases with time. Corrosion products layer composition and elements distribution was studied using an electronic microprobe; crystalline phases composition was determined by X‐ray diffraction.