Protection of the Bluing of a Class 25 Iron with Microcrystalline Wax

A piece of iron is characterized chemically and metallographically, by nominal composition it classified as Iron A48 class 25. Later, hot immersion, a coating similar to commercial blued generated, which refers an oxide layer that serves anchor for treatment with microcrystalline ozokerite wax. Through this wax possible seal the pores have effective protection against corrosion in 3% saline solution. The carried out 5M NaOH solution mixed 3M potassium chloride KNO 3 , one hour at 90°C order generate film (bluing process), stabilized tannic acid covered sample was electrochemically evaluated m/m saline. results Electrochemical Impedance Spectroscopy EIS, Scanning Electron Microscopy SEM are analyzed.