Volume-5 ~ Issue-1

Abstract: The corrosion inhibition effect of surfactant, N,N-Dimethyl-N-(2-Phenoxyethyl)dodecan-1- aminiumbromide(DPDAB) on mild steel corrosion in 0.5M Sulphuric acid was investigated by weight loss, potentiodynamic polarization and Electrochemical impedance spectroscopic techniques. DPDAB is an excellent inhibitor and its inhibition efficiency increases with increase in concentration and maximum inhibition efficiency was observed above the critical micelle concentration (CMC). The polarization curves reveal that DPDAB acts as mixed type inhibitor with predominantly of anodic type. The corrosion inhibition efficiency of DPDAB increases with increase in concentration and decreases with increase in temperature from 298K to 308K and then increases and shows maxima at 318K and then decreases at 328K.. The adsorption of the inhibitor on the mild steel in 0.5M H2SO4 was found to obey Langmuir's adsorption isotherm. Scanning electronic microscopy (SEM) confirmed the existence of an adsorbed protective film on the metal surface. The kinetic and thermodynamic parameters were calculated and discussed.

Key Words: CMC, Corrosion Inhibition, EIS, Mild steel, Surfactant

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[9]. Prathibha B.S, P. Kotteeswaran, V. Bheema raju, Study on the inhibition of Mild steel corrosion by N, N- dimethyl-N-(2-phenoxyethyl) dodecan-1-aminiumbromide in HCl Medium, IOSR-JAC, 2(5), 2012, 61-70.

[10]. Bentiss F., M. Lebrini and M. Lagrenee, Thermodynamic characterization of metal dissolution and inhibitor adsorption processes in mild steel/2,5-bis(n-thienyl)-1,3,4-thiadiazoles/hydrochloric acid system, Corros. Sci., 47,2005, 2915-2931.

Abstract: Wool and nylon fabrics were dyed using four different types of acid dyes of various colours i.e Lugani 101 (black), brown 3RG, nylomine (navy blue), methyl orange. Generally both wool and nylon fabrics exhibited higher percentage exhaustion. Relatively, nylon showed higher percentage exhaustion compared to wool. Also the dyed wool and nylon fabrics possess good fastness towards bleaching rubbing, pressing and perspiration but poor fastness to higher and washing.

Keywords – Acid dyes, exhaustion, fastness, nylon, wool,

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[10] A.Guesmi, N. B. Hamadi, N. Ladhari, F.. Sakli, Sonicator dyeing of modified acrylic fabric with indin caxanthin natural dye. Industrial crop and Products, 42, 63-69 (2013).

Abstract: Exerting necessitated concentrations of Nitrate and fluoride to the organic highland cropping systems is a vital management technique. All the chemical elements of the earth's crust occur in widely differing omnipresent concentrations, due to their different nuclear chemical formation and geochemical history. The use of biological nitrogen and fluoride inputs complicates its balancing act due to dandier uncertainty in inorganic Nitrogen and Fluoride availability. The growers to strike maintain Nitrogen provisioning to support crop growth and retention of limit pollution followed by fluoride associated soils. Due to various activities of the man in domestic field, agriculture area and industrial establishment the environment around us consisting soil, water and air gets polluted. Fluoride inexhaustible concentrations forbid the growth of crop even though nitrates reposit in the cultivated soils. The purpose of this project was to establish kinetics when nitro fluorides associated in the highland soils to different crop systems towards environmental pollutions. Cordia Africana and alfalfa are the plants which make soil to get enrichment of Nitrates and deescalate of concentrations of fluorides from cultivated soils through its decomposition. This entire study went on its conventionally tilled crops followed by Cordia Africana and alfalfa stems and leaf particles. Surface soil nitrate concentrations were measured weekly, biweekly by volumetric analysis and nitrate leaching was estimated from tension Lysimeters which were buried at the soil bedrock interface. Subsequently by using Orion 720A fluoride ion meter, deescalated concentrations of fluorides have been measured. The demonstrated concentrations of Soil in NO3 variables, coefficients of variations from the mean concentrations across all samplings have been recorded sporadically. The total area of the soil bed was maintained the same PH values until project was completed by weigh Lysimeters. The timing of elevated Nitrate concentrations (10-15PPM) and the concentrations of fluoride in deeper soil water corresponds with fallow periods. These dynamics will assist growers in adapting the timing management operations and reduces nitrate departures.

Keywords: Highland cultivation, Lysimeters, Orion fluoride Ion, biomasses.

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