Abstract
Surface of low carbon austenitic stainless steel (AISI 316L) was modified by duplex surface treatment to improve its wear behavior, without compromising corrosion resistance of the steel. The duplex surface treating process composed of pack boriding (B) and pack chromizing (Cr) stages. Some specimens were duplex surface treated by boriding followed by chromizing (B–Cr), while some others were treated via chromizing followed by boriding (Cr–B), to evaluate the effect of duplex treatment sequence on wear and corrosion resistances. Microstructural studies, phase identification, wear and corrosion behaviors of the specimens were evaluated by scanning electron microscope (SEM), X-ray diffractometer (XRD), pin-on-disc wear test, and potentiostat electrochemical test. The results show that the precedence of boriding stage to chromizing stage makes significant improvement in wear and corrosion resistances of the duplex coating, whereas B-Cr coating provided superior wear resistances (up to 49%) and reduced corrosion rate (up to 4.5 times) in comparison to Cr-B and boriding coatings. Corrosion resistance of B-Cr coating was comparable to that of the stainless steel.
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