Composite coating methods play a major role in enhancing the life of the components by improving the wear resistance of the surface coating used. Electrodeposited composite coatings consist of a metal matrix with either a ceramic or cermets particle addition which represents the new development in the field of coating processes. Electrode position has been identified to be a technologically feasible and for many applications, economically superior technique for the production of nanocrystalline materials. The objective of giving a coating to a substrate is to enhance Engineering and physical properties of the substrate material or to obtain an entirely new property. Electroplating, as a methodology is used to produce a thin layer or an additional surface on to a given substrate. Thin layer is produced to modify the properties of the substrate such as wear resistance, hardness, lubricity, electrical resistance, etc. In this work an attempt is made for preparation of Ni-Al2O3 composite coatings by adjusting the plating parameters such as current density, pH value of the bath, Amount of Al2O3 particles in the bath, Agitation speed and temperature of the bath. The mass of deposit for various Ni- Al2O3 composite coated specimens at different plating parameters are measured experimentally. A neural network model is also developed for the prediction of mass of deposit in the coated specimens for various plating parameters.
Key words: Composite coatings, metal matrix, electro deposition, neural network model, Ni- Al2O3
[...] Hence, in this study, it is proposed to develop neural network model for prediction of mass of deposit of the composite coating RESULT AND DISCUSSION 7.1 Discussions of experimental results The effect of composite deposition in the substrate material is affected by the plating parameters array. In these work only five parameters has considered. The two parameters such stirrer revolution and bath concentration are maintained at constant level throughout the experiment. The following table illustrates the experimental trials and the mass of deposits as the output for different plating conditions. [...]
[...] Comparison chart for Experimental and ANN results CONCLUSIONS The above neural network model is developed based on 5 plating parameters such as pH value of the bath, current density, rotational agitation speed, temperature of the bath and amount of aluminium oxide particles in the bath only. It is also noted that the experimental and neural network model developed is only for prediction of mass of deposit. Based on those results, the following conclusions have been made. The optimum conditions for plating are found to be, Current Density = 3 A/dm2 Temperature = 60°C EXP. [...]
[...] The Watt's Nickel Bath contains the following: Nickel Sulphate = 250 gpl Nickel Chloride = 30 gpl Boric Acid Surfactant = 40 gpl = 0.02 m Fig 1 Electroplating Experimental Setup The Al2O3 composite particles of 5 microns size is also assorted in the above Watt's Bath electrolyte and continuously agitated to maintain the composite particles always in suspension in the electrolyte solution by mechanical stirrer. The plating parameters such as pH value of the bath, Current density, rotational agitation speed and Al2O3 amount in the bath and temperature of the electrolyte are continuously monitored with appropriate instruments. [...]
[...] The various applications of Nickel Aluminiumoxide electro deposition are surface coating of Textile Mill Rollers, Engine Cylinder Block, Smaller size gears and Cams ALUMINIUM OXIDE AS COMPOSITE PARTICLES The different composite particles normally used are Silicon carbide, Silicon nitride, Boron carbide Diamond particles, Aluminium oxide for improved wear resistance. The reasons for chosen the Aluminium oxide particles as composite material in the above electro deposition is due to the features such as excellent heat and wear resistance, hard ceramic material, provides good adherent with metal matrix, cheap and ease of availability, and good chemical stability ELECTROPLATING AS A METHOD OF DEPOSITION There are numerous methods of surface deposition available for composite coatings such as Physical vapour Deposition and Chemical Vapour Deposition, Thermal Spraying, Hard facing etc.,. [...]
[...] Curre nt dens ity pH value 4 30°C 45°C 60°C Ms o d p s a s f e o it pH value 4 30°C 45°C 60°C Cur re nt de ns ity 3 as pos it M s of de Fig.7.pH Fig.5.pH Vs Mass of deposit in Vs Mass of deposit in milligrams at Current density 3 A/dm2 milligrams at Current density 1in A/dm2 Curre nt de ns ity pH value 4 30°C 45°C 60°C Ms o d p s a s f e o it Fig.6.pH Vs Mass of deposit in milligrams at Current density 2 A/dm2 The maximum deposition is obtained when the pH is maintained at 3.5 for a given value of current density and temperature Effect of Temperature Current density Tem perature Mass of deposit 140 Mass of deposit Tem perature pH 3 pH 3.5 pH 4 Current density 2 pH 3 pH 3.5 pH 4 Fig.8.Temperature in Vs Mass of deposit at A/dm2 Current density 1 Fig.9.Temperature in Vs Mass of deposit at Current density 2 A/dm2 Current density Mass of deposit Tem perature pH 3 pH 3.5 pH 4 Fig.10.Temperature Vs Mass of deposit at Current density 3 A/dm ARTIFICIAL NEURAL NETWORKS ANN is an information processing system and consists of a large number of very simple in a highly interconnected processor called neurodes or neurons. [...]
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