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Corrosion testing of phosphatized steel samples

✍ Scribed by Dr. P.-E. Augustsson; Prof. Dr. N.-G. Vannerberg

Publisher
John Wiley and Sons
Year
1981
Tongue
German
Weight
519 KB
Volume
32
Category
Article
ISSN
0947-5117

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✦ Synopsis

Abstract

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 22.0Β°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.

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