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Krishnaveni K.,Mission Research | Ravichandran J.,Mission Research | Selvaraj A.,CBM College
Acta Metallurgica Sinica (English Letters) | Year: 2013

The Morinda tinctoria (MT) plant leaves extract was prepared in aqueous and hydrochloric acid media and was used as corrosion inhibitor for mild steel in hydrochloric acid medium. MT is found to be an efficient inhibitor at room temperature and the efficiency decreases with increase in temperature. Results from colorimetric studies predict the amount of iron present in the test solution and the percentage inhibition efficiency values calculated from this data fit well with the weight loss experiments. The AC impedance studies reveal that the mild steel surface is positively charged and the process of inhibition is through charge transfer. Polarisation studies indicate the mixed nature of the inhibitor. Thermodynamic parameters obtained predict that the process of inhibition is a spontaneous one. © The Chinese Society for Metals and Springer-Verlag Berlin Heidelberg.

Mallaiya K.,PSG College of Technology | Subramaniam R.,PSG College of Technology | Srikandan S.S.,PSG College of Technology | Gowri S.,PSG College of Technology | And 2 more authors.
Electrochimica Acta | Year: 2011

The corrosion inhibition efficiency of a newly synthesized Schiff's base for the corrosion of mild steel was studied in 1.0 M HCl and 0.5 M H 2SO4 solutions. The results of weight loss measurements, electrochemical impedance and potentiodynamic polarization measurements consistently demonstrated that the Schiff's base synthesized is a good corrosion inhibitor with an inhibitory efficiency of approximately 92% at an optimum inhibitor concentration of 600 mg/L. The inhibition in both of the corrosive media was observed to be a mixed type. The potential of zero charge (PZC) at the metal-solution interface was determined for both the inhibited and uninhibited solutions to provide the mechanism of inhibition. The inhibitor formed a film on the metal surface through chloride or sulfate bridges depending upon the medium. The temperature dependence of the corrosion rate was also studied in the temperature range from 27 to 50 °C. The value of the activation energy (Ea) calculated showed that the inhibition film formation on the metal surface occurred through chemisorption. The thermodynamic parameters such as the adsorption equilibrium constant (Kads) and the free energy of adsorption (ΔGads) were calculated and discussed. Several adsorption isotherms were tested and the experimental data fit well with the Langmuir adsorption isotherm. © 2011 Elsevier Ltd. All rights reserved.

Krishnaveni K.,Mission Research | Ravichandran J.,Mission Research | Selvaraj A.,CBM College
Ionics | Year: 2014

The corrosion inhibition of mild steel in 0.5 M sulphuric acid by aqueous and acid extracts of leaves of Morinda tinctoria was studied using weight loss, colorimetric and electrochemical techniques. Results obtained indicate that both the extracts are effective in sulphuric acid medium and the efficiency decreases with increase in temperature. Added halide additives improve the efficiency of the inhibitor. From the thermodynamic, spectral, and surface analyses, the nature of adsorption has been found out. © 2013 Springer-Verlag Berlin Heidelberg.

Chitra S.,PSGR Krishnammal College For Women | Parameswari K.,PSGR Krishnammal College For Women | Vidhya M.,PSGR Krishnammal College For Women | Kalishwari M.,PSGR Krishnammal College For Women | Selvaraj A.,CBM College
International Journal of Electrochemical Science | Year: 2011

Novel Quinoxaline derivatives have been synthesised and evaluated as corrosion inhibitors for mild steel in 1M sulphuric acid by weight loss, gasometry and electrochemical techniques. Results obtained showed that they are efficient corrosion inhibitors. Tafel polarisation studies revealed that the quinoxalines were mixed type inhibitors but slightly cathodic in nature. The adsorption of all the quinoxalines on the mild steel surface from the acid solution has been found to obey Langmuir adsorption isotherm. Addition of halide ions synergistically enhanced the inhibition of the quinoxalines. © 2011 by ESG.

Fawzia Khan F.,Karpagam University | Mallika R.,CBM College
International Journal of Applied Engineering Research | Year: 2015

Object Oriented JavaScript is the most popularly used programming language by most of the web page developers for creating user friendly interaction pages. During the creation of web pages using the Java script, few bugs might be created which causes functionality failure of the web pages and affects the user friendly environment. There are many types of bugs in the object oriented java script which are needed to be detected for maintaining the user flexibility of the web pages. The detection of bugs is a tedious process normally done by using various Java script tools. In this research, tools such as JavaScriptLint, JSLint, CodeBeautify, ScrypTik, PMD and Yasca core are utilized to detect the bugs effectively. All these tools, however, exempted some bugs. The bug detection using the effective tools is evaluated and the limitations of bug exemption are discussed to develop a framework called Effective Object Oriented Bug Detection (EOOBD) based on the detection and non-detection of the bugs by these tools. For better detection of bugs, a matching algorithm called Boyer-Moore matching is utilized. The development of EOOBD is to evaluate what kind of bugs can be effectively detected using the detection tools and helps in understanding how to utilize suitable tools for different types of bugs in the Object Oriented Java script code. The experimental results also show that the proposed EOOBD provides sufficient understanding of various bugs and efficient tools to detect them with better accuracy. © Research India Publications.

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