On the corrosion resistance of AISI 316L-type stainless steel coated with manganese and annealed with flow of oxygen

Aisi 316l-type stainless steel was coated with 300-nm-thick mn thin films and post-annealed at 673 k with a constant flow of oxygen (250 cm^3/min). the films crystallographic and morphological structures were analyzed using x-ray diffraction (xrd) and atomic force microscopy (afm) before corrosion test and scanning electron microscopy (sem) after corrosion test. corrosion behavior of the samples in 0.3, 0.5 and 0.6 m nacl solutions was investigated by means of potentiodynamic and electrochemical impedance spectroscopy (eis) techniques. results showed that the corrosion inhibition of annealed mn/ss316l in all nacl solutions with different concentrations is higher than that of bare ss316l. a correlation is achieved between the structural variation of the films with the potentiodynamic and eis corrosion results.