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Shanmugam, K.
- Corrosion and Metallurgical Characteristics of AZ31B Magnesium Alloy Under NaCl Environment
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Authors
Affiliations
1 Department of Manufacturing Engineering, Annamalai University, Annamalainagar, Chidambaram, Tamil Nadu, IN
1 Department of Manufacturing Engineering, Annamalai University, Annamalainagar, Chidambaram, Tamil Nadu, IN
Source
Manufacturing Technology Today, Vol 15, No 11 (2016), Pagination: 9-28Abstract
An investigation was carried out to quantify and characterize the corrosion behaviour of AZ31B magnesium alloy. The specimens were underwent immersion, salt spray, pitting and galvanic corrosion tests in order to quantify and characterize the corrosion rates of the AZ31B specimens with the influence of different pH values, chloride ion concentration and the corrosion time. An attempt was also made to develop an empirical relationship to predict the corrosion rate of AZ31B magnesium alloy. Three factors, five level, central composite rotatable design matrix was used to minimize the number of experimental conditions. Response surface methodology was used to develop the relationship. The developed relationship can be effectively used to predict the corrosion rate of AZ31B magnesium alloy at 95% confidence level. The results show that the corrosion rate was higher in salt spray corrosion tests than the immersion, pitting and galvanic corrosion tests.Keywords
AZ31B Magnesium Alloy, Response Surface Methodology, Corrosion Rate.
References
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- Performance of Plasma Transferred ARC Hard Faced Friction Stir Welding Tools for Joining AA7075-T6 Aluminium Alloy
Abstract Views :196 |
PDF Views:1
Authors
Affiliations
1 Centre for Materials Joining & Research (CEMAJOR), Department of Manufacturing Engineering, Annamalai University, Annamalainagar, Tamil Nadu, IN
1 Centre for Materials Joining & Research (CEMAJOR), Department of Manufacturing Engineering, Annamalai University, Annamalainagar, Tamil Nadu, IN
Source
Manufacturing Technology Today, Vol 15, No 5 (2016), Pagination: 17-26Abstract
In the present work an attempt was made to develop low cost high temperature wear resistance hard facing tools. The hard facing was applied on mild steel rod using chromium carbide powder and tungsten carbide powder by plasma transferred arc (PTA) hard facing technique. A comparative study was done to study the performance of hard facing tools with conventional tools. In this work, friction stir welding of AA7075-T6 plate of 6 mm thickness was investigated with an aim to understand the performance of tool materials on weld microstructure and tensile properties. The results showed that sound joints can be achieved with a joint efficiency of 83% while using PTA hard faced tools with careful selection of optimized process parameters.Keywords
Plasma Transferred Arc Hard Facing, Friction Stir Welding, Aluminum Alloy, Tensile Properties.- Microstructural Characterization and Immersion Corrosion Behavior of Atmospheric Plasma Sprayed Alumina Coatings on AZ31B Magnesium Alloy in Nacl Solution
Abstract Views :185 |
PDF Views:2
Authors
Affiliations
1 Department of Manufacturing Engineering, Annamalai University, Annamalainagar, Chidambaram, Tamil Nadu, IN
1 Department of Manufacturing Engineering, Annamalai University, Annamalainagar, Chidambaram, Tamil Nadu, IN
Source
Manufacturing Technology Today, Vol 15, No 2 (2016), Pagination: 10-23Abstract
Plasma sprayed ceramic coatings are successfully used in many industrial applications, where high wear and corrosion resistance with thermal insulation are required. The corrosion degradation of a uncoated and atmospheric plasma sprayed alumina (APS) coatings on AZ31B magnesium alloy was investigated using immersion corrosion test in NaCl solutions of different chloride ion concentrations viz., 0.01 M, 0.2 M, 0.6M and 1M. The corroded surface was characterized by an optical microscope and X-ray diffraction. The results showed that the corrosion deterioration of uncoated and coated samples were significantly influenced by chloride ion concentration. The uncoated magnesium and alumina coatings was found to offer a superior corrosion resistance in lower chloride ion concentration NaCl solutions (0.01M and 0.2MNaCl). On the other hand the coatings and Mg alloy substrate were found to be highly susceptible to localized damage, and could not provide an effective corrosion protection in solutions containing higher chloride concentrations (0.6M and 1 M). It was found that the corrosion resistance of the ceramic coatings and base metal gets deteriorated with the increase in the chloride concentrations.Keywords
Atmospheric Plasma Spraying, Magnesium Alloy, Chloride Ion Concentration, Corrosion, NaCl.- Friction STIR Welding of Copper Alloys by Pta Hardfaced Tungsten Carbide Tools
Abstract Views :159 |
PDF Views:1
Authors
Affiliations
1 Department of Manufacturing Engineering, Annamalai University, Annamalainagar, Tamil Nadu, IN
1 Department of Manufacturing Engineering, Annamalai University, Annamalainagar, Tamil Nadu, IN
Source
Manufacturing Technology Today, Vol 14, No 11 (2015), Pagination: 3-11Abstract
In the present work an attempt was made to develop high temperature wear resistant hardfacing tools for friction stir welding (FSW) of commercial grade copper alloy. Hardfacing was applied on mild steel rod using Tungsten carbide forming powder by plasma transferred arc hardfacing (PTA) process. Commercially available tool materials like high carbon steel (HCS), high speed steel (HSS) and super high speed steel (SHSS) were also used to friction stir weld copper alloy for comparison purpose. From this investigation, it is found that the PTA hardfaced tool yielded defect free joints without tool wear compared to other joints. The optimum level of heat generation, formation of finer grains and higher hardness of stir zone are main reasons for the superior tensile properties of the joints fabricated by PTA hardfaced tungsten carbide tools.Keywords
Friction Stir Welding, Copper Alloy, Plasma Transferred Arc Hard Facing, Tensile Properties, Microstructure.- Statistical Analysis and Optimization of Atmospheric Plasma Spraying Parameters to Attain Maximum Corrosion Resistance in Alumina Coatings on AZ31B Magnesium Alloy
Abstract Views :149 |
PDF Views:1
Authors
Affiliations
1 Department of Manufacturing Engineering, Annamalai University, Annamalainagar, Chidambaram, Tamil Nadu, IN
1 Department of Manufacturing Engineering, Annamalai University, Annamalainagar, Chidambaram, Tamil Nadu, IN
Source
Manufacturing Technology Today, Vol 14, No 6 (2015), Pagination: 10-26Abstract
In this study, an attempt has been made to establish an empirical relationship is developed to predict corrosion rate of the atmospheric plasma sprayed alumina coatings on AZ31B magnesium alloy by incorporating process parameters such as power, stand-off distance and powder feedrate. Statistical tools such as design of experiments, analysis of variance, and regression analysis are used to develop the relationships. The developed empirical relationship can be effectively used to predict the corrosion rate of plasma sprayed alumina coated AZ31B magnesium alloy at the 95% confidence level. Sensitivity analysis was carried out and compared with the relative impact of three process parameters on corrosion rate to verify the measurement errors on the values of the uncertainty in estimated parameters. The results indicate that the input power has the greatest influence on corrosion rate, followed by stand-off distance and powder feedrate.Keywords
Atmospheric Plasma Spraying, Corrosion Rate, Response Surface Methodology Alumina Coating.- Comparative Study of the Corrosion Behavior of AZ31B Magnesium Alloy under Immersion and Salt Fog Environments
Abstract Views :176 |
PDF Views:0
Authors
Affiliations
1 Dept of Manufacturing Engineering, Annamalai University, Annamalainagar, Chidambaram, Tamil Nadu, IN
1 Dept of Manufacturing Engineering, Annamalai University, Annamalainagar, Chidambaram, Tamil Nadu, IN
Source
Manufacturing Technology Today, Vol 13, No 8 (2014), Pagination: 12-29Abstract
The comparative evaluation of corrosion behavior of AZ31B magnesium alloy was investigated by conducting immersion and salt spray tests in NaCl solution. The specimens were exposed to immersion and salt spray environments in order to characterize their corrosion rates. In addition, an attempt was made to develop an empirical relationship to predict the corrosion rate of the AZ31B magnesium alloy in immersion tests and salt spray corrosion tests using response surface methodology. The corrosion morphology observation was carried out by scanning electron microscopy. General corrosion was more prevalent on the immersion surface. However, the pits on the salt spray surface showed larger surface areas, larger volumes, and covered more area on the micrographs as compared to the pits on the immersion surfaces, due to the pit debris that trapped chloride ions within the pits. Finally, it concludes that the AZ31B magnesium alloys are suitable for immersion conditions than salt spray environments.Keywords
Magnesium Alloys, Immersion Tests, Salt Spray Tests, Corrosion Rate, Response Surface Methodology.- Predicting Porosity and Microhardness of the High Velocity Oxy-Fuel (HVOF) Sprayed Iron Based Amorphous Metallic Coatings
Abstract Views :216 |
PDF Views:4
Authors
Affiliations
1 Centre for Materials Joining and Research (CEMAJOR), Department of Manufacturing Engineering, Annamalai University, Annamalai Nagar, Tamil Nadu, IN
2 Protective Technologies Department, Naval Materials Research Laboratory (NMRL), Ambernath, Thane (Dist), Maharashtra, IN
1 Centre for Materials Joining and Research (CEMAJOR), Department of Manufacturing Engineering, Annamalai University, Annamalai Nagar, Tamil Nadu, IN
2 Protective Technologies Department, Naval Materials Research Laboratory (NMRL), Ambernath, Thane (Dist), Maharashtra, IN
Source
Manufacturing Technology Today, Vol 16, No 1 (2017), Pagination: 18-28Abstract
Fluid handling equipment such as propellers, impellers, pumps posses the inherent risk of flow-dependent erosion-corrosion problems. Though there are many coating materials available to combat erosion-corrosion damage in the above components, iron based amorphous coatings exhibits high erosion-corrosion resistance. High velocity oxy-fuel (HVOF) spray process is extensively used to deposit erosion-corrosion resistance amorphous coatings. In this investigation, iron based amorphous metallic coating was deposited on 316 stainless steel using HVOF spray process by varying the parameters such as oxygen flow rate, fuel flow rate, powder feed rate, carrier gas flow rate, and spray distance. Empirical relationships were established to predict the porosity and micro hardness of iron based amorphous coating. Microstructure observations of the coating were done by optical microscope. From the results, it is found that, fuel flow rate and spray distance appeared to be the most significant parameters affecting the mechanical properties of the iron based amorphous coating.Keywords
High Velocity Oxy Fuel Spray, Iron Based Amorphous Metallic Coating, Micro-Hardness, Porosity.References
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