Inhibition of Corrosion of Carbon Steel in Sea Water by Sodium Molybdate – ZN2+ System (original) (raw)
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Inhibition of Corrosion of Carbon Steel in Sea Water by Sodium Gluconate - Zn2+ System
Portugaliae Electrochimica Acta, 2013
The inhibition efficiency of sodium gluconate (SG)-Zn 2+ system in controlling corrosion of carbon steel in sea water has been evaluated by weight-loss method. The formulation consisting of 250 ppm of SG and 75 ppm of Zn 2+ has 98% IE. Influence of duration of immersion on the IE of SG-Zn 2+ has been evaluated. The mechanistic aspects of corrosion inhibition have been investigated by polarization study and AC impedance spectra. The protective film has been analysed by FTIR and luminescence spectra. The surface morphology and the roughness of the metal surface have been analysed by atomic force microscopy. The protective film consists of Fe 2+-SG complex and Zn(OH) 2. It is found to be UV-fluorescent.
2013
The inhibition efficiency of sodium gluconate (SG)-Zn 2+ system in controlling corrosion of carbon steel in sea water has been evaluated by weight-loss method. The formulation consisting of 250 ppm of SG and 75 ppm of Zn 2+ has 98% IE. Influence of duration of immersion on the IE of SG-Zn 2+ has been evaluated. The mechanistic aspects of corrosion inhibition have been investigated by polarization study and AC impedance spectra. The protective film has been analysed by FTIR and luminescence spectra. The surface morphology and the roughness of the metal surface have been analysed by atomic force microscopy. The protective film consists of Fe 2+ -SG complex and Zn(OH) 2 . It is found to be UV -fluorescent.
INHIBITION OF CORROSION OF CARBON STEEL IN A DAM WATER BY SODIUM MOLYBDATE - Zn2+ SYSTEM
The inhibition efficiency of sodium molybdate (SM) in controlling corrosion of carbon steel in Sothuparai dam water, Tamil Nadu, India, in the absence and presence of Zn 2+ has been evaluated by the weight loss method. The formulation consisting of 250 ppm of SM and 30 ppm of Zn 2+ offers 82% inhibition efficiency to carbon steel. A synergistic effect exists between SM and Zn 2+. Polarization study reveals that SM-Zn 2+ system functions as an anodic inhibitor, and the formulation controls the anodic reaction predominantly. 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+-MoO 4 2─ complex and Zn(OH) 2. The protective film is found to be UV fluorescent.
Synergistic Effect of THAM- Molybdate and Zn 2+ on the Inhibition of Corrosion of Mild Steel in
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.
Inhibition of corrosion of carbon steel by heptane sulphonic acid – Zn 2+ system
2012
Corrosion inhibition of carbon steel in dam water by sodium heptane sulphonate (SHS) and zinc ion system was investigated using weight loss and potentiodynamic polarization methods. Results of weight loss method indicated that inhibition efficiency (IE) increased as the inhibitor concentration increased. A synergistic effect existed between SHS and Zn 2+. The influence of sodium potassium tartrate (SPT) on the IE of the SHS-Zn 2+ system was evaluated. As the immersion period increased, the IE decreased. Polarization study revealed that SHS-Zn 2+ system functioned as a cathodic inhibitor. AC impedance spectra revealed that a protective film was formed on the metal surface. The nature of the metal surface was analyzed by FTIR spectra, SEM and AFM analyses.
European Chemical Bulletin, 2013
The corrosion inhibition efficiency of Isonicotinamide (ISN) in controlling the corrosion of carbon steel in one normal(1N) hydrochloric acid solution(HCl) in absence and presence of Zn 2+ has been studied by weight loss method. Weight Loss study reveals that the formulation consisting of 10 ppm of ISN and 10 ppm of Zn 2+ has 78% inhibition efficiency. The results of polarisation study shows that the formulation function controls the anodic reaction predominantly. The AC impedance spectra reveal that a protective film formed on the metal surface. FTIR spectrum reveal that the protective film consists of Fe 2+ -ISN complex on the anodic sites of metal surface and Zn(OH) 2 formed on cathodic sites of metal surface.
The inhibition effect of MGD (Malachite green dye) on the corrosion of mild steel was studied by weight loss, Potentiodymanic polarization and FTIR spectra. The absence and presence of Zn 2+ was studied. MGD alone has some inhibition efficiency of 76%. Increasing the concentration of MGD and Zn 2+ , the efficiency has increases. The influence of the TSC (Trisodium citrate) on the corrosion inhibition of MGD+Zn 2+ system was studied and the IE is 100%. Present study was aimed to investigate the inhibition efficiency of MGD-Zn 2+-TSC in controlling the corrosion of carbon steel immersed in aqueous solution containing 60 ppm Cl-. Potentiodymanic polarization study and FTIR shows that protective film formed on the metal surface.
Surface Protection of Carbon Steel by Hexanesulphonic Acid-Zinc Ion System
ISRN Corrosion, 2014
Inhibition of corrosion of carbon steel in dam water by hexanesulphonic acid as its sodium salt C6H13SO3Na (SHXS) in the absence and presence of a bivalent cation zinc ion (Zn2þ) has been investigated using weight loss method. Results of weight loss method indicate that inhibition efficiency (IE) increased with increase of inhibitor concentration. Polarization study reveals that SHXS-Zn2+system controls the cathodic reaction predominantly. AC impedance spectra reveal that a protective film is formed on the metal surface. The nature of the metal surface has been analysed by Fourier Transform Infrared Spectroscopy (FTIR) and Atomic Force Microscopy (AFM).
The Inhibition Efficiency (IE) of Sodium-Potassium Tartrate (SPT), in controlling corrosion of carbon steel in RO water in the absence and presence of Zn 2+ has been evaluated by mass-loss method. The formulation consisting of 175ppm SPT and 10ppm Zn 2+ has 92.1% IE. It is found that the Inhibition efficiency of SPT increases with the addition of Zn 2+ ion. A synergistic effect exists between SPT and Zn 2+. Polarization and surface characterization analyses study and FT-IR spectrum confirm the protection of the carbon steel surface by inhibitive film. A suitable mechanism for corrosion inhibition has been proposed based on the results obtained from the above studies.
Korean Journal of Chemical Engineering, 2019
The performance of sodium molybdate (Na 2 MoO 4) (VI) as a corrosion inhibitor for medium carbon steel corrosion in saline water containing nitrate and chloride ions was studied at various inhibitor concentrations, temperatures, exposure times and rotational velocities. Mass loss and electrochemical techniques were used to evaluate the corrosion rates. The individual and interactive effects of these four parameters were optimized for minimum response of corrosion rate using central composite design (CCD) with response surface methodology (RSM). Nonlinear regression strategy in light of Gauss-Newton technique was utilized for modeling and optimization of the corrosion inhibition experiments. Second-order polynomial model was suggested to predict the corrosion rates as a function of four variables. The individual effect of temperature on corrosion rate was higher than the individual effects of inhibitor concentration, exposure time and rotational velocity, respectively. The interaction effects of independents variables were also addressed. Open circuit potential measurements were used as a significant way to gain information about the behavior of steel corrosion. Steady state potential was reached after one hour of immersion time. Mass loss results were in a good agreement with potentiodynamic polarization technique. Optimum inhibition efficiency was 95.9% at optimum operating conditions. Polarization plots revealed that the inhibitor acts as the anodic-type inhibitor.