Abstract
The phenolic coatings used to protect the steel of railway tanks during the shipment of concentrated sulphuric acid have been studied by microbeam PIXE and a.c. impedance measurements. After repeated washing and filling cycles, these coatings begin to lose their resistance to corrosion but the breakdown mechanism is not presently well understood. A 20 μm focused proton beam has been used to scan the approximately 200 μm thick coatings to obtain the depth profiles of sulphur, which, as sulphate ions, are thought to migrate towards the steelcoating interface and initiate the breakdown process. Parallel electrochemical impedance spectroscopy (EIS) measurements have been performed to determine the electrical properties of the metal-coating system. Samples were exposed to concentrated sulphuric acid for periods of up to six months.
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