Abstract
A piece of iron is characterized chemically and metallographically, by nominal composition it is classified as Iron A48 class 25. Later, by hot immersion, a coating similar to a commercial blued coating is generated, which refers to an oxide layer that serves as an anchor for treatment with microcrystalline ozokerite wax. Through this wax it is possible to seal the oxide pores and have an effective protection against corrosion in 3% saline solution. The treatment is carried out in a 5M NaOH solution mixed with 3M potassium chloride KNO3, for one hour at 90°C in order to generate an oxide film (bluing process), stabilized with tannic acid and covered with ozokerite microcrystalline wax. The sample was electrochemically evaluated in 3% m/m saline. The results of Electrochemical Impedance Spectroscopy EIS, and Scanning Electron Microscopy SEM are analyzed.
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