corrosion inhibition of aisi 304 stainless steel using zinc nitride coating

The corrosion behavior of zn/ (aisi304) annealed at different temperatures with flow of nitrogen gas was investigated  in  the  3.5%nacl  solution. crystallography  structure  of  the  samples  was analyzed using x-ray diffraction (xrd) pattern. the results showed that with increasing annealing temperature, the intensities of oxide and nitride phases were increased. surface morphology of the samples  was  studied  using  atomic  force  microscope  (afm)  before  corrosion  tests. afm  results showed that by increasing annealing temperature, grains become greater that may be the result of heat accumulation,  causing  higher  rate  of  diffusion  in  the  sample. electrochemical  impedance spectroscopy (eis) and polarization tests were carried out for corrosion resistance investigation of the produced samples. the corrosion results revealed that highest corrosion resistance was achieved for  the  sample  at  the  highest  annealing  temperature. for  more  in  depth  analysis, the  equivalent circuit of samples was obtained, using the eis data. finally, the surface  of the corroded samples was observed using scanning electron microscopy (sem).