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The influence of sodium chloride on the atmospheric corrosion of steel

✍ Scribed by R. Ericsson

Publisher
John Wiley and Sons
Year
1978
Tongue
German
Weight
498 KB
Volume
29
Category
Article
ISSN
0947-5117

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✦ Synopsis

The influence of sodium chloride on the atmospheric corrosion of mild steel has been studied. Samples covered with sodium chloride crystals ( 8 pg NaCl ' c m -2 ) have been exposed to an SO,-free atmosphere a t different relative humidities. The combined effect of sodium chloride crystals on a steel surface and sulphur dioxide in the atmosphere has been investigated at an SO,-supply of 1 pg SO2 . cm-, . h-' ( 1 ppm SO,). The corrosion attack was followed by periodic weighings. The corrosion products formed have been studied using the SEM-technique. On exposure of samples with sodium chloride in an SO2-free atmosphere the extent of corrosion increased with increasing relative humidity from 58% to 9095, interrupted by a sharp minimum at about 87% relative humidity. The SEM-studies showed that tower shaped corrosion products were formed at a high relative humidity while filiform corrosion appeared when the relative humidity was lowered. A t 90% relative humidity more corrosion was observed with clean steelsamples and an S02-supply of I pg. cm-, . h-' than with sodium chloride crystals on the surfaces ( 8 pg NaCl. c m -2 ) in the absence of SO2. In the combined influence of sodium chloride on the steel surfaces and sulphur dioxide in the atmosphere a synergic effect was noticed at 90% relative humidity. A t 70% relative humidity no influence of an S02-supply of 1 ~. ( g SO, ' c.m-2 . h-' on the corrosion of steel samples with sodium chloride crystals on their surfaces could be observed, *) Vortrag, gehalten auf der 'Pagung ,,Korrosion durch Meerwasser" an der Fachhochschule Wilhelmshaven, 28. bis 30. April 1977.

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