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Influence of inhibitors on the corrosion behavior of the X5CrNi18 10 stainless steel‐welded joint
Author(s) -
Radojković Bojana,
Kovačina Jovanka,
Jegdić Bore,
Bobić Biljana,
Alić Behar,
Marunkić Dunja,
Simović Anđela
Publication year - 2021
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.202012039
Subject(s) - corrosion , materials science , metallurgy , pitting corrosion , intergranular corrosion , welding , passivation , dielectric spectroscopy , microstructure , base metal , electrochemistry , composite material , electrode , layer (electronics) , chemistry
This study considers the corrosion behavior of the X5CrNi18 10 stainless steel‐welded joint in NaCl solution, with and without the presence of several corrosion inhibitors (NaNO 3 , Ce(NO 3 ) 3 , and CeCl 3 ). The degree of sensitization of the welded joint to intergranular corrosion is determined using the electrochemical potentiokinetic reactivation method with a double‐loop method. Pitting corrosion tests are performed by the potentiodynamic method. Resistance to general corrosion and the stability of the passive film is assessed based on the results of electrochemical impedance spectroscopy measurements, as well as on the values of the corrosion and passivation current. The main goal of this study is to determine the relation of the welded joint microstructure to general and pitting corrosion in the presence of the corrosion inhibitors. The value of pitting potential for the base metal and weld metal in the presence of the NaNO 3 or Ce(NO 3 ) 3 inhibitor is shifted to potentials in the transpassive area. The pitting potential for the heat‐affected zone also possesses a noticeable higher value. However, nitrate ions do not increase the general corrosion resistance of any part of the welded joint. CeCl 3 does not increase resistance to general or pitting corrosion.