Variable Temperature Mossbauer Study of Some Rust Converters

摘要

The conversion properties of 15 different combinations of rust converters have been studied. The results indicate that the rust layer without conversion is composed of spinel phase, akaganeite, magnetically ordered goethite, and lepidocrocite. On the other hand, besides the mentioned iron oxides and oxyhydroxides, the converted-rust layer consists of iron phosphate and iron tannate. M?ssbauer spectrometry has allowed us to classify the degree of conversion of the different formulations according to both the tannic acid content and the mixture of the isopropyl and terbutanol alcohol. It was found that there is a specific mixture of alcohol for each tannic concentration for which the power of conversion is greatly enhanced. It is also concluded that non-stoichiometric spinel phase underwent the greater transformation of about 90, followed by magnetically blocked goethite, in which 30 of it was transformed. In contrast, akaganeite seems to be not noticeably affected by the converters. It was not possible to assess the effect on lepidocrocite.