Abstract: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, electroch… Show more
“…3. 17,24 During the impact process, the kinetic energy of the erodent particle is transferred directly to the coating and materials are removed by formation of cracks. 35 The velocity of the impacting sand particles varies at different sections of volute.…”
Section: Resultsmentioning
confidence: 99%
“…The interactions between the processes of erosion and corrosion have only been evaluated for a limited range of parameters, though in reality erosion-corrosion occurs over a wide range of variables. 24 The exposure of substrate to the water should be least for minimising corrosion and for this porosity has to be kept close to zero. Inspection of failed components revealed that the failure process is corrosion initiated and then erosion dominant corrosion initiated layers are removed faster due to combination of factors like micro pitting, local cavitations and impulsive jet of water with sand erodents.…”
Section: Other Influencing Factorsmentioning
confidence: 99%
“…The interactions between the processes of erosion and corrosion have only been evaluated for a limited range of parameters, though in reality erosion–corrosion occurs over a wide range of variables. 24…”
The centrifugal pumps made of grey cast iron deployed in mining conditions encounter severe erosion and corrosion problems causing sudden failures. To combat this, the thermal spray 'high velocity oxyfuel' (HVOF) process was selected to provide a cermet coating, namely, WC-Co-Cr-Ni. After design investigation on coatings, erosion and corrosion experiments were conducted and characterisation studies involving microstructure, surface morphology and energy dispersive X-ray fluorescence analysis were made. The operating parameters on the different sections of impact volute surface were assessed and accordingly, the coating thickness was designed scientifically for maximum impact loads and minimum corrosion failures. The life of the coated pump casings has been improved up to 12 times by optimising the coating thickness.
“…3. 17,24 During the impact process, the kinetic energy of the erodent particle is transferred directly to the coating and materials are removed by formation of cracks. 35 The velocity of the impacting sand particles varies at different sections of volute.…”
Section: Resultsmentioning
confidence: 99%
“…The interactions between the processes of erosion and corrosion have only been evaluated for a limited range of parameters, though in reality erosion-corrosion occurs over a wide range of variables. 24 The exposure of substrate to the water should be least for minimising corrosion and for this porosity has to be kept close to zero. Inspection of failed components revealed that the failure process is corrosion initiated and then erosion dominant corrosion initiated layers are removed faster due to combination of factors like micro pitting, local cavitations and impulsive jet of water with sand erodents.…”
Section: Other Influencing Factorsmentioning
confidence: 99%
“…The interactions between the processes of erosion and corrosion have only been evaluated for a limited range of parameters, though in reality erosion–corrosion occurs over a wide range of variables. 24…”
The centrifugal pumps made of grey cast iron deployed in mining conditions encounter severe erosion and corrosion problems causing sudden failures. To combat this, the thermal spray 'high velocity oxyfuel' (HVOF) process was selected to provide a cermet coating, namely, WC-Co-Cr-Ni. After design investigation on coatings, erosion and corrosion experiments were conducted and characterisation studies involving microstructure, surface morphology and energy dispersive X-ray fluorescence analysis were made. The operating parameters on the different sections of impact volute surface were assessed and accordingly, the coating thickness was designed scientifically for maximum impact loads and minimum corrosion failures. The life of the coated pump casings has been improved up to 12 times by optimising the coating thickness.
“…Consequently, hardness increased significantly due to the uniformly distributed secondary hard carbides and hard complex phases. Zhuo and associates deposited a nano-Al 2 O 3 reinforced Ni-based alloying layer by plasma alloying to have better erosion resistant 316L steel [94]. They found the increased erosion resistance beyond a certain rotational speed.…”
Silt erosion causes big efficiency and economic losses to hydro turbines and other industries involving the relative motion of the slurry/silt. This article reviews various techniques employed in the literature to mitigate the silt erosion. The main prominence is given to the latest technologies rather than the number of articles on the same technology. The available techniques are classified into two broad categories namely, surface modification techniques, and bulk material modification techniques; then reviewed systematically. The parameters (properties) which largely influence the material loss, for corresponding techniques, are also familiarized. In addition to this, how these parameters were improved and why these parameters enhanced the slurry erosion performance are discussed. Surface coating increases the surface hardness, is found to be the most addressed and most successful technique for the said purpose. The hardness of the substrate was found to be the most addressed property which can largely control the silt erosion.
“…Electric brush plating technology, as one of the methods of electrodeposition, has been applied widely to fabricate metallic and composite coatings in engineering 68 The coatings can be deposited on the surfaces of arbitrary size and shape.…”
Nanocrystalline nickel coatings were fabricated on smooth steel substrates using electric brush plating technology. The coatings were characterised by X-ray diffraction, scanning electron microscopy, field emission scanning electron microscopy and atomic force microscope. Cetyltrimethyl ammonium bromide (CTAB) as cationic surfactant is used to improve the surface morphologies of coatings. With the content of CTAB increasing in electrolyte, the size of microscale nodules consisting of nanoscale grains were reduced, (111) texture was formed, and the surface having totally single nanosized grains structure was prepared on the surface of brush plating coatings. The formation mechanisms of nickel coatings deposited were also analysed based on the process of deoxidisation, adsorbing and withdrawing.
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