The aim of the present study was to study the effect of nano-Al2O3 particles on erosion–corrosion behaviour of Ni based alloying layer in acidic slurry flow. The nano-Al2O3 reinforced Ni based alloying layer was prepared by double glow plasma alloying on 316L stainless steel surface, where Ni/nano-Al2O3 was firstly predeposited by brush plating. AISI 316L stainless steel and single Ni based alloying layer without Ni/nano-Al2O3 interlayer were used as reference materials. Potentiodynamic polarisation, electrochemical impedance spectroscopy and mass loss techniques were applied to study the corrosion and erosion–corrosion behaviour of nano-Al2O3 reinforced Ni based alloying layer in acidic solution (10 wt-%HCl), acidic flow (10 wt-%HCl) and acidic slurry flow (10 wt-%HCl z 10 wt-% sand particles). Results of potentiodynamic polarisation indicated that the corrosion potentials Ecorr of investigated materials were decreased and anodic current densities of investigated materials were increased under acidic flow condition when compared with that of obtained in static corrosion. Comparing with that obtained in acidic flow condition, a further decrease in corrosion potential Ecorr and increase in anodic current density was observed under acidic slurry flow condition. Among the investigated materials, the corrosion current densities icorr of nano-Al2O3 reinforced Ni based alloying layer were higher than that of Ni based alloying layer, but obviously lower than that of 316L stainless steel under three different conditions. The impedance measurements revealed that the size of semicircle diameters of investigated materials decreased continuously with rotating the samples in acidic flow and acidic slurry flow, comparing with that of obtained in static corrosion. The corrosion resistance of nano-Al2O3 reinforced Ni based alloying layer was lower than that of single alloying layer under three different conditions. Mass loss studies under acidic slurry flow conditions indicated that there was a threshold of rotational speed vc, above which the mass loss of nano-Al2O3 reinforced Ni based alloying layer was apparently lower than that of single alloying layer. At 3·45 m s–1 ( vc<3·45 m s–1), the percentage of synergism of nano-Al2O3 reinforced Ni based alloying layer decreased by 17·26 and 16·76% as compared to that of AISI 316L stainless steel and single Ni based alloying layer.
The present study was focused on understanding the effect of the added nano-Al 2 O 3 on erosioncorrosion behaviour of composite alloying layer. The nano-Al 2 O 3 reinforced composite alloying layer was prepared by duplex surface treatment, which consisted of Ni/nano-Al 2 O 3 predeposited by brush plating and a subsequent surface alloying with Ni-Cr-Mo-Cu by double glow process on the surface of AISI 316L stainless steel. Current response with applied potential, potentiodynamic polarisation curve, electrochemical impedance spectroscopy and weight loss techniques were applied to evaluate the erosion-corrosion behaviour of composite alloying layer compared with the single alloying layer and 316L stainless steel under hydrodynamic conditions. Results of electrochemical measurements showed that the erosion-corrosion resistance of composite alloying layer was lower than that of single alloying layer when the rotating velocity of tested samples was below 2?51 m s 21 , whereas the erosion-corrosion resistance of composite alloying layer was higher than that of single alloying layer when the rotating velocity of tested samples above 2?51 m s 21 . The weight loss rate studies and surface analysis suggested that the dispersive undissolved nano-Al 2 O 3 particles and c9 prime (Ni 3 Al) phase were helpful to improve the erosion-corrosion resistance of composite alloying layer at high rotational speed, though the c9 prime phase was deleterious to corrosion resistance of composite alloying layer. Xu et al. Effect of nano-Al 2 O 3 on erosion-corrosion behaviour of composite alloying layer Corrosion Engineering, Science and Technology 2011 VOL 46 NO 3 Xu et al. Effect of nano-Al 2 O 3 on erosion-corrosion behaviour of composite alloying layer Corrosion Engineering, Science and Technology 2011 VOL 46 NO 3 Xu et al. Effect of nano-Al 2 O 3 on erosion-corrosion behaviour of composite alloying layer Corrosion Engineering, Science and Technology 2011 VOL 46 NO 3
In order to improve the corrosion and erosion-corrosion resistance of 316L stainless steel in engineering application, two kinds of composite alloying layers were prepared by a duplex treatment, consisting of Ni/nano-SiC and Ni/nano-SiO 2 predeposited by brush plating, respectively, and a subsequent surface alloying with Ni-Cr-Mo-Cu by double glow process. Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) were performed on the two kinds of composite alloying layer using 10 wt% HCl solution to assess the corrosion behavior. Erosion-corrosion tests were carried out by erosion-corrosion test rig in acidic flow and acidic slurry flow for test time of 20 h at four different rotational speeds. Results of electrochemical tests indicated that the corrosion resistance of composite alloying layer with brush plating Ni/nano-SiO 2 particles interlayer approximated to that of single Ni-based alloying layer, whereas the corrosion resistance of the composite alloying layer with brush plating Ni/nano-SiC particles interlayer was apparently inferior to that of Ni-based alloying layer in 10 wt% HCl solution at static state. Under the conditions of acidic flow and acidic slurry flow, the mass losses of tested samples increased with increase in the time of erosion-corrosion tests and the rotational speeds of samples. The mass losses of composite alloying layer with brush plating Ni/nano-SiO 2 particles interlayer were lower than that of single Ni-based alloying layer at all rotational speeds, except at 1.88 m/s in acidic flow. The mass losses of composite alloying layer with brush plating Ni/nano-SiC particles interlayer were higher than that of single Ni-based alloying layer at all rotational speeds, but were obviously lower than that of AISI 316L stainless steel. The influences of second phase on the corrosion and erosion-corrosion of the two kinds of composite alloying layer were discussed in this paper.
In order to improve the high-temperature behaviors of hot work die steel in engineering application, the high-temperature wear and thermal fatigue behavior of brush plating Ni/nano-SiO 2 composite coating have been investigated. The microstructure of Ni/nano-SiO 2 composite coating has been analyzed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). TEM observation of Ni/nano-SiO 2 composite coating has shown that the added SiO 2 particle with an average size of about 20 nm is uniformly distributed in Nickel matrix. The high-temperature wear behavior of Ni/nano-SiO 2 composite coating has been investigated using a ball-on–block test rig. The results from the high-temperature wear behaviors studies indicate that the steady-state friction coefficient and the specific wear rate of Ni/nano-SiO 2 composite coating are lower than that of Cr 12 MoNi steel. The thermal fatigue tests were fulfilled by heating and quenching in water at a cycle period of 2 min. The results of thermal fatigue testing show that brush plating Ni/nano-SiO 2 composite coating can improve thermal fatigue resistance as compared to the Cr 12 MoNi hot rolling tool steel.
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