Laser Surface Alloying of 316L Stainless Steel with Ru and Ni Mixtures

• Published in: International journal of corrosion Vol. 2012; no. 2012; pp. 1 - 4
• Main Authors: Lekala, M. B., Pityana, S. L., van der Merwe, J. W.
• Format: Journal Article
• Language: English
• Published: Cairo, Egypt Hindawi Puplishing Corporation 01-01-2012; Hindawi Publishing Corporation; Hindawi Limited
• Subjects: Alloy powders; Alloy steels; Alloying elements; Alloys; Austenitic stainless steels; Behavior; Corrosion; Corrosion potential; Corrosion tests; Heat resistant steels; Lasers; Nickel; Ruthenium; Stainless steel
• ISSN: 1687-9325; 1687-9333
• DOI: 10.1155/2012/162425

The surfaces of AISI 316L stainless steel were laser alloyed with ruthenium powder and a mixture of ruthenium and nickel powders using a cw Nd:YAG laser set at fixed operating parameters. The microstructure, elemental composition, and corrosion characteristics of the alloyed zone were analyzed using optical and scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and corrosion potential measurements. The depth of alloyed zone was measured using the AxioVision program and found to be approximately 1.8 mm for all the alloyed specimens. Hardness profile measurements through the surface-substrate interface showed a significant increase from 160 HV for the substrate to a maximum of 247 HV for the alloyed layer. The sample laser alloyed with 80 wt% Ni-20 wt% presented the most noble corrosion potential (Ecorr) of −0.18 V and the lowest corrosion current density (icorr).