Impact of High-Velocity Oxy-Fuel ZrO₂ Coating on Corrosion Resistance and Fatigue Life of AISI 316L Austenitic Stainless Steel

Abstract

Purpose. The purpose of this research paper is to investigate the corrosion and fatigue life of AISI 316L austenitic stainless steel in the absence and presence of high-velocity oxy-fuel ZrO2 coating. Design/Methodology/Approach. AISI 316L austenitic stainless steel is chosen for the investigation, keeping in mind, its widespread usage in naval and marine applications where the members are exposed to corrosive sea water environment. ZrO2 coating is a popular surface treatment provided to mechanical members to improve their corrosion resistance. Being a refractory material, ZrO2 inhibits the corrosion of the AISI 316L austenitic stainless steel in marine applications. But, the study of the effect of ZrO2 coating on the corrosion and fatigue life of the material hitherto is scarce and hence the present investigation is undertaken. The corrosion and fatigue analysis of the coated specimens are carried out by taking two control parameters, namely, rotational speed of job and axial speed of torch, into consideration and applying L4 Taguchi orthogonal array. Findings. The corrosion resistance of the material has increased but the fatigue strength has decreased upon coating of ZrO2 on AISI 316L austenitic stainless steel. The failure has occurred because of the formation of oxide layers on the steel during coating.

Effect of Al2TiO5 powder coating on the tribological, corrosion and mechanical properties of AISI 316L stainless steel

“…The fatigue life of the base material without coating is 11253 cycles while the coated samples had a fatigue life in the range of 9856-10895 cycles. A similar trend is recorded with the fatigue life for AISI 316L with ZrO 2 [7].…”

“…The corrosion resistance measured in terms of pitting potential is in the range of 1038-1092 mV. The coat thickness and the pitting potential are found to be in the monotonically increasing function and similar trend was observed for AISI 316L with a coating of ZrO 2 [7].…”

“…Coating of Zirconia by HVOF method on AISI 316L substrate abridged its fatigue life but resistance to corrosion increased considerably. Zirconia coating enabled to the increase in pitting potential of the substrate from 914 mV to 1009 mV; however the fatigue life was decreased from 11220 cycles, in case of uncoated specimen to 11010 cycles for the coated counterpart [7]. Coating of Al 2 O 3 -TiO 2 increased the corrosion stability, especially for the HVOF-sprayed coatings [8].…”

TOPSIS – Taguchi Analysis of Notch Parameters on the Fatigue Life of Super Duplex Stainless Steel

“…The notch concentration factor has increased with the increase of notch width and depth. It is observed that, higher the notch concentration factor, lower is the fatigue life of the specimen and vice-versa; this result is also in tandem with the materials when those are subjected to static and fluctuating loads [11]. In multiple response situations, compensatory methods like TOPSIS allow trade-off between criteria, where a poor result in one criterion may be neglected by a good result in another criterion, provides a realistic form of modelling and hence normalization is performed with weights [12,13].…”