The synergetic effect of molybdenum and nitrogen alloying elements on austenitic stainless steels pitting resistance

摘要

Stainless steels are extensively used in aggressive environments because of their good mechanical properties and corrosion resistances. Molybdenum increases the corrosion resistance of stainless steels in acidic and neutral environments [1]. Nitrogen is also known to make them stronger and more resistant to corrosion [2]. However, the interaction of Mo and N as alloying elements in the same grade is not clearly understood. Some studies suggested that this synergy is due to Mo increasing the potentials of metal dissolution and pitting [3]. Others suggested that Mo supresses pit initiation while N decreases the passive current density by accumulating beneath the passive film [4].