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Corrosion testing of phosphatized steel samples
Author(s) -
Augustsson P.E.,
Vannerberg N.G.
Publication year - 1981
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/maco.19810321105
Subject(s) - corrosion , inert , zinc , metallurgy , relative humidity , materials science , zinc phosphate , inert gas , phosphate , humidity , chemistry , composite material , organic chemistry , physics , thermodynamics
A method for corrosion testing of phosphatized steel samples has been described. The specimens, treated with different phosphatizing, solutions and covered by a chemically inert paint film, have been exposed in a sulphur‐dioxide‐polluted atmosphere with 90% relative humidity at 22.0°C. The corrosion rate has been measured as an increase in weight. The corrosion resistance shows a good correlation with the crystal coverage of the zinc phosphate layers. Filiform corrosion can be inhibited by zinc phosphate as well as iron phosphate coatings. However, underfilm corrosion is more frequent on the iron phosphatized samples.