Evaluación de la corrosión en caliente por métodos electroquímicos de un acero aisi 304h en presencia del óxido de níquel como inhibidor

In this research, the behaviour of nickel oxide as inhibitor of hot corrosion of stainless steel AISI 304H in presence of a salt compound for 80% V2O5 20%Na2SO4 in weight and oxidant atmosphere of 99%O2 1%SO2 was studied. Two molars ratios inhibitor / salt 2:1 and 3:1 were used and electrochemical techniques as linear polarization resistance, EIS and Tafel extrapolation were employed to evaluate the influence of temperature and time in the NiO inhibition, to determine oxidation rate and inhibitor efficiency on the material damage. Results showed that the techniques of direct current only were effectives when the electrolyte have a ionic behaviour, while that the techniques of alternate current were reliable for the alls condition test, showed an high resistance to the transference charge. The results showed that the damage of material were controlled for a charge transference very high through solid electrolyte and oxide layer formed, this was confirmed by SEM techniques carried to the tested samples..In this research, the behaviour of nickel oxide as inhibitor of hot corrosion of stainless steel AISI 304H in presence of a salt compound for 80% V2O5 20%Na2SO4 in weight and oxidant atmosphere of 99%O2 1%SO2 was studied. Two molars ratios inhibitor / salt 2:1 and 3:1 were used and electrochemical techniques as linear polarization resistance, EIS and Tafel extrapolation were employed to evaluate the influence of temperature and time in the NiO inhibition, to determine oxidation rate and inhibitor efficiency on the material damage. Results showed that the techniques of direct current only were effectives when the electrolyte have a ionic behaviour, while that the techniques of alternate current were reliable for the alls condition test, showed an high resistance to the transference charge. The results showed that the damage of material were controlled for a charge transference very high through solid electrolyte and oxide layer formed, this was confirmed by SEM techniques carried to the tested samples.. En la presente investigación se estudió el comportamiento del óxido de níquel como inhibidor de la corrosión en caliente de un acero AISI 304H en presencia de una sal compuesta por 80% V2O5 20%Na2SO4 en peso y una atmósfera oxidante de 99%O2 1%SO2. Se utilizaron dos relaciones molares inhibidor / sal: 2:1 y 3:1 y se emplearon las técnicas electroquímicas de resistencia a la polarización lineal, EIS y extrapolación de Tafel, con el fin de evaluar la influencia d