scholarly journals Corrosion inhibition and statistical data of low carbon steel in HCl media by admixed organic compounds

2021 ◽  
Vol 2070 (1) ◽  
pp. 012149
Author(s):  
Roland Tolulope Loto ◽  
Cleophas Akintoye Loto ◽  
Richard Leramo ◽  
Babatunde Oyebade
Keyword(s):  
Carbon Steel ◽  
Organic Compounds ◽  
Corrosion Inhibition ◽  
Exposure Time ◽  
Inhibition Efficiency ◽  
Low Carbon Steel ◽  
Calculated Data ◽  
Carbon Steels ◽  
Low Carbon ◽  
Inhibitor Concentration

Abstract Corrosion inhibition of carbon steels with organic compounds exhibiting effective corrosion inhibition is an on-going research. The corrosion inhibition of low carbon steel in 1M HCl solution by the combined admixture of vanillin and benzonitrile (VBN), and salvia officinalis with lavendulan officinalis (SLV) was studied by weight loss method. Results obtained show that VBN and SLV performed effectively with maximum inhibition efficiency 91.03% at 1.5% VBN concentration and 97.89% at 5% SLV concentration. The inhibition efficiency of VBN increased with concentration but decreased with exposure time compared to the values obtained for SLV which showed non-dependence on concentration and exposure time after 1% SLV concentration. Correlation plots of inhibition efficiency versus inhibitor concentration show VBN to be more concentration dependent in performance. Calculated data for standard deviation shows the degree of variation from mean values for both compounds is significant at low inhibitor concentration due to time dependence action. Statistical analysis through ANOVA shows inhibitor concentration overwhelmingly influences the inhibition performance of the despite even though exposure time is statistically relevant to minimal degree.

Corrosion Inhibition Effect of Neem Leaf Oil Distillates on Low Carbon Steel in Dilute HСl and NH4Cl Acid Media

2021 ◽  
Vol 1042 ◽  
pp. 101-108
Author(s):  
Roland Tolulope Loto ◽  
Kingsley Akpanyung
Keyword(s):  
Standard Deviation ◽  
Carbon Steel ◽  
Corrosion Inhibition ◽  
Exposure Time ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Acid Media ◽  
Loss Analysis ◽  
Improved Stability ◽  
Leaf Oil

Neem leaf oil distillates (NLD) was evaluated for its corrosion inhibition properties on low carbon steel in 0.5 M HCl, 1 M HCl, 3.74 M NH4Cl and 5.61 M NH4Cl solutions. Weight loss analysis shows NLD performed effectively at all concentrations studied in HCl media with optimal inhibition efficiencies of 97.54% and 97.56% at 5% NLD concentrations. NLD performed poorly at 1-4% NLD concentration in 3.74 M and 5.61 M NH4Cl solutions with protection performance values below 50%. At 5% NLD concentration the protection performance values increased sharply to 78.53% and 79.0% at 312 h of exposure. Standard deviation values for NLD protection performance output in 0.5 M HCl solution were significantly high indicating highly unstable inhibition behavior and thermodynamic tendency to corrode with respect to exposure time. At 5% NLD concentration the standard deviation value decreased significantly. In 1 M HCl, 3.74 M NH4Cl and 5.61 M NH4Cl solutions the standard deviation values were relatively low due to improved stability of protonated NLD molecules in interaction with the steel surface. Experimental data showed 92.44%, 100%, 30.77% and 20% of NLD protection performance data from 0.5 M HCl, 1 M HCl, 3.74 M NH4Cl and 5.61 M NH4Cl solutions are above 70% inhibition value with margin of error of +7.99, +0, +11.22 and +9.72. Statistical data from analysis of variance showed exposure time dominates the performance output of NLD distillate on low carbon steel from 0.5 M HCl and 1 M HCl at values of 81.76% and 82.03% compared to the effect of NLD concentration which were negligible. In NH4Cl solution, NLD concentration dominates the protection performance output of NLD on the carbon steel compared to exposure time with values of 96.42% and 96.95%.

Effect of Soaking Time on Paste Carburizing of Carburized Low Carbon Steel

2017 ◽  
Vol 740 ◽  
pp. 93-99
Author(s):  
Muhammad Hafizuddin Jumadin ◽  
Bulan Abdullah ◽  
Muhammad Hussain Ismail ◽  
Siti Khadijah Alias ◽  
Samsiah Ahmad
Keyword(s):  
Carbon Steel ◽  
Carbon Content ◽  
Low Carbon Steel ◽  
Case Depth ◽  
Carbon Steels ◽  
Low Carbon ◽  
Soaking Time ◽  
Low Carbon Steels ◽  
Carburized Steel ◽  
Carburizing Process

Increase of soaking time contributed to the effectiveness of case depth formation, hardness properties and carbon content of carburized steel. This paper investigates the effect of different soaking time (7-9 hours) using powder and paste compound to the carburized steel. Low carbon steels were carburized using powder and paste compound for 7, 8 and 9 hours at temperature 1000°C. The transformation of microstructure and formation carbon rich layer was observed under microscope. The microhardness profiles were analyzed to investigate the length of case depth produced after the carburizing process. The increment of carbon content was considered to find the correlation between types of carburizing compound with time. Results shows that the longer carburized steel was soaked, the higher potential in formation of carbon rich layer, case depth and carbon content, which led to better hardness properties for carburized low carbon steel. Longer soaking time, 9 hours has a higher dispersion of carbon up to 41%-51% compare to 8 hours and 7 hours. By using paste carburizing, it has more potential of carbon atom to merge the microstructure to transform into cementite (1.53 wt% C) compare to powder (0.97 wt% C), which increases the hardness of carburized steel (13% higher).

Predicting the Effects of Cold Working on the Machining Characteristics of Low Carbon Steels

1987 ◽  
Vol 109 (3) ◽  
pp. 257-264 ◽  
Author(s):  
E. M. Kopalinsky ◽  
P. L. B. Oxley
Keyword(s):  
Flow Stress ◽  
Carbon Steel ◽  
Cutting Forces ◽  
Cold Working ◽  
Low Carbon Steel ◽  
Carbon Steels ◽  
Low Carbon ◽  
Low Carbon Steels ◽  
Steel Work ◽  
Machining Characteristics

Experiments show that the cold working of low carbon steel work materials can improve their machinability by reducing cutting forces and improving surface finish and tool life. The somewhat paradoxical result of reducing cutting forces by cold working a material so that its hardness is increased is explained in this paper by using a machining theory which takes account of the flow stress properties of the work material and can thus allow for the effects of cold working.

Phenylcoumarin Glucoside as a Natural Inhibitor in the Protection of Low Carbon Steel Against Corrosion

MRS Advances ◽  
2017 ◽  
Vol 2 (62) ◽  
pp. 3909-3915
Author(s):  
Héctor M. Barbosa Cásarez ◽  
Araceli Espinoza Vázquez ◽  
Francisco J. Rodríguez-Gomez
Keyword(s):  
Carbon Steel ◽  
Inhibition Efficiency ◽  
Electrochemical Impedance ◽  
Electrochemical Techniques ◽  
Low Carbon Steel ◽  
Steel Corrosion ◽  
Low Carbon ◽  
Low Concentrations ◽  
Natural Inhibitor ◽  
Polarization Studies

AbstractPhenylcoumarin glucoside (4-PC) is a compound extracted from the plant Hintona latiflora and was studied as inhibitor for AISI 1018 steel corrosion in 3% NaCl solution using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques, which may find application as eco-friendly corrosion inhibitors. The 4-PC provides inhibitor properties that protect AISI 1018 low carbon steel against corrosion at low concentrations (5 ppm) obtained by EIS. Polarization studies showed that the inhibitor was of mixed type. The inhibition efficiency by the two electrochemical techniques shows similar results. The inhibitor adsorption was demonstrated to be a combined process (physisorption and chemisorption) according to the Langmuir isotherm.

A Laboratory Corrosion Inhibition Study of Carbon Steel Using 2-Mercaptobenzothiazole (MBT) under Post-combustion CO2 Capture Conditions

CORROSION ◽  
10.5006/3663 ◽  
2021 ◽  
Author(s):  
Wei Li ◽  
James Landon ◽  
Dali Qian ◽  
Kunlei Liu
Keyword(s):  
Carbon Steel ◽  
Corrosion Inhibition ◽  
Co2 Capture ◽  
Carbon Steels ◽  
Inhibition Mechanism ◽  
Low Carbon ◽  
Inhibition Study ◽  
Corrosion Rates ◽  
Organic Corrosion Inhibitor ◽  
Carbon Dioxide Co2

Corrosion mitigation is an important aspect of amine-based post-combustion carbon dioxide (CO2) capture operations due to the desire to use less expensive but corrosion-vulnerable materials such as low carbon steels in the construction of a capture system. In this study, the corrosion behavior of A106 (grade B) carbon steel with an in-house proprietary amine-based solvent was investigated in a laboratory environment at 80 °C using an organic corrosion inhibitor, 2 Mercaptobenzothiazole (MBT). The corrosion inhibition mechanism was interpreted by electrochemical methods and surface analyses. The results revealed that the corrosion rates of carbon steel were significantly retarded using MBT. The critical inhibitor concentration was determined to be lie between 10 to 50 ppm under the tested conditions.

Effect of Ti, Al and Mg Addition on the Impact Toughness of Heat Affected Zone in Low Carbon Steel

2009 ◽  
Vol 79-82 ◽  
pp. 143-146
Author(s):  
Jiang Hua Ma ◽  
Dong Ping Zhan ◽  
Zhou Hua Jiang ◽  
Ji Cheng He
Keyword(s):  
Carbon Steel ◽  
Impact Toughness ◽  
Heat Affected Zone ◽  
Low Carbon Steel ◽  
Optical Microscope ◽  
Carbon Steels ◽  
Low Carbon ◽  
Welding Simulation ◽  
Mg Addition ◽  
The Impact

In order to understand the effects of deoxidizer such as aluminium, titanium and magnesium on the impact toughness of heat affected zone (HAZ), three low carbon steels deoxidized by Ti-Al, Mg and Ti-Mg were obtained. After smelting, forging, rolling and welding simulation, the effects of Al, Ti and Mg addition on the impact toughness of HAZ in low carbon steel were studied. The inclusion characteristics (size, morphology and chemistry) of samples before welding and the fracture pattern of the specimens after the Charpy-type test were respectively analyzed using optical microscope and scanning electron microscopy (SEM). The following results were found. The density of inclusion in Ti-Mg deoxidized steel is bigger than Ti-Al deoxidized steel. The average diameter is decreased for the former than the latter. The addition of Ti-Mg can enhance the impact toughness of the HAZ after welding simulation. The maximal value of the impact toughness is 66.5J/cm2. The complex particles of MgO-TiOx-SiO2-MnS are most benefit to enhance impact toughness. The improvement of HAZ is attributable to the role of particle pinning and the formation of intergranular ferrite.

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