Abstract
Laser surface alloying was used in this study to introduce nitrogen-containing stainless steel layers on carbon steel to improve its corrosion resistance. The alloying materials used were FeCrNiSi 3N 4 and FeCrMnSi 3N 4 powders which were pre-mixed before laser irradiation. The chemical composition, the microstructure and the electrochemical behavior of the alloyed layers were of particular interest and analyzed. Potentiodynamic polarization tests were performed to evaluate the corrosion resistance of the laser treated alloys in deaerated 3.5 wt.% NaCl solution at pH 4. Two austenitic stainless steels, namely 316L and P900N, were tested for comparison. Experimental results indicated that nitrogen contents in the laser treated FeCrNiSiN and FeCrMnSiN alloys could reach 0.38 and 0.83 wt.% respectively. The FeCrNiSiN layer exhibited higher resistance to pitting corrosion in Cl − containing solution as compared with those of 316L and P900N stainless steels. However, the pitting corrosion resistance of FeCrMnSiN layer was inferior to those of the 316L and P900N stainless steels.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have