kroanalyse und Analyse von Quenchnitten wurde die auf der Obefflache von Kohlenstoffstihlen in warigen Natriumnitritlosungen gebildete Schicht untersucht. Es wurde festgestellt, daB sich unter diesen Bedingungen auf der Stahloberflache keine passive Schicht, sondern eine Schutzschicht bildet, welche komplizierte Komplexverbindungen des T p Fe(NH3)x(N03)3.yHz0 enthiilt. Die Stake der Schicht betragt 8-18 p in Abhbgigkeit der Nitritkonzentration in der Umgebung.Using a spectral analysis, metallography, X-ray spectral microanalysis and cross-section analysis the layer formed on the surface of carbon steel in aqueous sodium nitrite solutions has been studied. It has been found that the layer formed under these conditions on the steel surface is not-a passive layer but a protective layer containing complex compounds of the type Fe(NH3),(NO3), -yH20. The thickness of the layer is 8 to 18 p depending on the nitrite concentration in the neighbourhood.
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