Surface and Electrochemical Behaviour of Carbon Steel in Neutral aqueous Environment (original) (raw)
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2012
The synergistic effect of THAM –Molybdate and Zn 2+ on the inhibition of corrosion of mild steel in aqueous environment containing 60 ppm Cl has been evaluated by the weight loss method. The mechanistic aspects of corrosion inhibition have been studied. The nature of the protective film has been analyzed by using potentiostatic polarization study, impedance spectra, U.V-visible absorption spectra and fluorescence spectra. The formulation consisting of THAM (50ppm) and 50 ppm of Zn 2+ - SM (250 ppm) has 82% corrosion inhibition efficiency.
2015
Research on the effect of the concentration of the inhibitor on the corrosion behavior of carbon-steel material has been done. The research was started by immersing the prepared carbon-steel plate in a 1 M HCl en-vironment. After that, corrosion inhibitor was added with several concentrations, which are 0, 100, 200, 300, and 400 ppm in to that environment, to be stirred using a magnetic stirrer at 300 rpm for 30 minutes under room temperatur condition. The effect of the added inhibitor was then analyzed using the Electrochemical Impedance Spectroscopies (EIS) method. The experiment results showed that the greater the concentration of the inhibitor, the greater the resistance, so that the metal is more pro-tected from corrosion attack. The calculation results showed that the inhibitor efficiency is directly proportional to the concentration of inhibitor that is achieved at a concentration of 400 ppm with an efficiency of 71.24%.
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The inhibitive action of pharmaceutically active compound on corrosion of carbon steel (CS) in 1.0 M HCl was studied by weight loss, potentiodynamic polarization and Electrochemical impedance spectroscopy techniques. Effect of temperature was investigated at temperature range (303-333 K). The obtained results indicate that the examined compound is an excellent inhibitor in 1.0 M HCl, and the inhibition efficiency (η %) increases with increasing the inhibitor concentration while it decreases with rising the temperature solution. Polarization curves show that the studied drug is mixed-type inhibitor in acidic medium. The adsorption of the inhibitor on the CS surface obeys the Langmuir adsorption isotherm. Thermodynamic parameters have been calculated and discussed. Surface analysis was performed to emphasis the inhibition efficiency of the studied drug inhibitor.
Inhibition of Carbon Steel Corrosion by DTPMP – SPT – Zn2+ System
With the objective of developing a new eco-friendly inhibitor formulation for the corrosion of carbon steel on neutral aqueous solution containing 60 ppm Cl-. The phosphonic acid {diethylenetriamine penta(methylene phosphonic acid)}(DTPMP) was chosen as the inhibitor, which gives the inhibition efficiency of 93%. Many phosphonic acids are used as good corrosion inhibitors like ATMP, HEDP and DTPMP etc. Among which we have used the DTPMP as a potent corrosion inhibitor for this study. Because it contains number hetero atoms like Oxygen and Nitrogen. The Sodium potassium Tartrate (SPT) which is an environment friendly and used as the first synergist, Zn2+ may be second synergist so it may used as a ternary inhibitor system. When DTPMP used alone shows some inhibition efficiency. If we combine with the formulation of 60 ppm Cl-, 50 ppm DTPMP, 25 ppm SPT, and 10 ppm Zn2+, it gives maximum inhibition efficiency. From FTIR spectra it was observed that the protective film is formed on the metal surface. EIS spectra also confirms the formation of protective film on the metal.
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Indian Journal of Chemical Technology, 2005
The inhibition efficiency (IE) of adipic acid (AA)-Zn 2+ system in controlling corrosion of carbon steel immersed in well water has been evaluated by weight-loss method. The formulation consisting of 50 ppm of AA and 50 ppm of Zn 2+ has 95% IE. At lower pH value(pH=6) IE decreases and in alkaline medium (pH=8) IE increases. Polarization study reveals that AA-Zn 2+ system functions as a mixed inhibitor. AC impedance spectra reveal that a protective film is formed on the metal surface. FTIR spectra reveal that the protective film consists of Fe 2+-AA complex and Zn(OH) 2 .