Effect of Inhibitor Concentration and Immersion Time on the Corrosion Rate and Inhibition Efficiency of AISI 1019 Steel in Inhibited Seawater Environment

This work deals with the study of corrosion behaviour for zinc in (HNO3+ H2SO4) binary acid mixture containing ethanolamines. Corrosion rate increases with concentration of acid and temperature. At constant acid concentration, the inhibition efficiency of ethanolamines increases with the inhibitor concentration. Value of ΔGa increases and inhibition decreases with temperature. The mode of inhibition action appears to be chemisorption.

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CORROSION BEHAVIOR OF CARBON STEEL WITH HMTA INHIBITOR IN PICKLING PROCESS

Surface Review and Letters ◽

10.1142/s0218625x07010834 ◽

2007 ◽

Vol 14 (06) ◽

pp. 1067-1071 ◽

Cited By ~ 3

Author(s):

D. LIU ◽

L. P. HUANG

Keyword(s):

Surface Roughness ◽

Weight Loss ◽

Carbon Steel ◽

Corrosion Rate ◽

Immersion Time ◽

Inhibition Efficiency ◽

Adsorption Process ◽

Free Energies ◽

Pickling Process ◽

Hydrogen Evolution Reactions

In this investigation, attempts have been made to study the inhibitive effect of hexamethylenetetramine (HMTA) on carbon steel in 10% HCl (mass%) by weight loss, potentiodynamic polarization, EIS, and AFM. Results indicate that inhibition efficiency (IE) of HMTA increases with the increase in pickling immersion time from 10 to 60 min, and IE also increases with the increase in temperature. At higher temperatures (80°C), the IE values are higher and almost independent of pickling time. HMTA can be adsorbed on the surface of metal and reduce the corrosion rate of metal. HMTA is a kind of mixed inhibitor and can retard both the anodic dissolution and cathodic hydrogen evolution reactions independently. IE increases with the concentration of HMTA. Electrochemistry measurement shows that adsorption follows the Langmuir isotherm and the value of free energies of adsorption (ΔG ads ) is < 0, so the adsorption process can occur automatically. AFM analyses show HMTA can affect the surface roughness and protect metal.

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Investigating the Inhibitive Characteristics of Moringa Oleifera on the Corrosion of Mild Steel

International Journal for Research in Applied Science and Engineering Technology ◽

10.22214/ijraset.2021.38012 ◽

2021 ◽

Vol 9 (9) ◽

pp. 595-602

Author(s):

Okpaga D. M

Keyword(s):

Weight Loss ◽

Corrosion Rate ◽

Mild Steel ◽

Immersion Time ◽

Moringa Oleifera ◽

Inhibition Efficiency ◽

Sodium Hydroxide Solution ◽

Total Surface Area ◽

Corrosion Rates ◽

Very High

Abstract: This work deals with the inhibitive characteristics of Moringa oleifera fruits and leaves extracts in Hydrochloric Acid solution and Sodium Hydroxide solution respectively on the corrosion of mild steel. This was carried out using weight loss and polarization techniques. The effects of immersion time, the effect of acid and alkaline concentration on the corrosion behavior of mild steel in 1.0M HCl and 1.0 NaOH with addiction of extracts were deduced. The fruits which were dried and grounded to powder of 10g and the leaves which range from 25cm3 to 100cm3 were used for this study. The corrosion rate was very high in the absence of inhibitors (Moringa oleifera fruits and the leaves extracts). The mild steel was cut into coupon averaging a total surface area of 4.262cm2 . The sample was weighed and immersed into a beaker containing 1.0M NaOH with different volumes of moringa leaves and 1.0M HCl with 10g dried concentrated powdered moringa fruits with coupons removed every 7 days for weight loss measurements till 4 weeks. The corrosion rates were found to be decreased by 83% in 1.0M HCl and 78% in 1.0M NaOH respectively, values of inhibition efficiency (ࣁ (%were calculated from weight loss. The results obtained showed that the Moringa oleifera fruits and leaves extracts could serve as effective inhibitors on the corrosion of mild steel in HCl and NaOH respectively. Keywords: Moringa oleifera, Corrosion rate, Weight loss, Mild steel, Inhibitor.

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Studi Penambahan Inhibitor Organik Ekstrak Daun Bawang Tiwai (Eleutherine americana Merr.) pada Baja API 5L dalam Lingkungan 3,5% NaCl

SPECTA Journal of Technology ◽

10.35718/specta.v2i3.11 ◽

2018 ◽

Vol 2 (3) ◽

pp. 1

Author(s):

Yunita Triana ◽

Sari Shaimah Rinda ◽

Awali Jatmoko ◽

Sulistijono Sulistijono

Keyword(s):

Corrosion Rate ◽

Corrosion Test ◽

Immersion Time ◽

Test Results ◽

Inhibitor Concentration ◽

Corrosive Media ◽

Polarization Measurements ◽

Inhibitory Efficiency ◽

Eleutherine Americana ◽

Organic Inhibitor

One that can be used as an organic inhibitor is bawang tiwai leaves extract. This study used 3.5% NaCl as corrosive media with inhibitor concentration of bawang tiwai leaves extract from 0 ppm to 500 ppm and immersion time from 10 days up to 30 days. The efficiency of inhibition was measured using a weight loss corrosion test, while the corrosion rate was obtained from polarization measurements. The FTIR test results show that the extract contains flavonoid compounds that act as antioxidants and inhibit corrosion. Inhibitory efficiency achieved up to 95.4545% for the addition of 300 ppm inhibitor and 20 days of immersion time. This inhibitory behavior is also supported by polarization measurements where the lowest corrosion rate of 0.00128 mm/year is obtained at the same concentration and immersion time.

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SELECTED BIS-THIADIAZOLE: SYNTHESIS AND CORROSION INHIBITION STUDIES ON MILD STEEL IN HCL ENVIRONMENT

Surface Review and Letters ◽

10.1142/s0218625x20500146 ◽

2020 ◽

Vol 27 (12) ◽

pp. 2050014

Author(s):

ABBAS Z. SALMAN ◽

QUSAY A. JAWAD ◽

KHALID S. RIDAH ◽

LINA M. SHAKER ◽

AHMED A. AL-AMIERY

Keyword(s):

Mild Steel ◽

Immersion Time ◽

Inhibition Efficiency ◽

Langmuir Adsorption Isotherm ◽

Inhibitor Concentration ◽

Conjugation System ◽

Inhibition Effect ◽

Langmuir Adsorption ◽

Acid Environment ◽

Inhibition Studies

The inhibition effect of synthesized corrosion inhibitor namely 5,5′-(1,4-phenylene)bis([Formula: see text]-phenyl-1,3,4-thiadiazol-2-amine) (PBPA) on the corrosion of mild steel in 1-M hydrochloric acid environment are examined by gravimetric techniques at various temperature (303–343 K). The synthesized inhibitor concentrations are 0.1–0.5[Formula: see text]mM. The inhibition efficiency increased with the increase of the inhibitor concentration. The inhibition efficiency reached 94% at the highest studied concentration of 0.5[Formula: see text]mM for 5[Formula: see text]h of immersion time and 303[Formula: see text]K. Moreover, the inhibition efficiency decreased with the temperature increase. The adsorption of tested inhibitor molecules on the surface of mild steel follows the Langmuir adsorption isotherm. The studied inhibitor molecules showed excellent inhibition since PBPA molecules have nitrogen and sulfur atoms in addition to phenyl and thiadiazol rings which were linked together in conjugation system.

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Synthesis New Pyridinium Salts as Corrosion Inhibitors for Mild Steel in 1 M H2SO4

Al-Nahrain Journal of Science ◽

10.22401/anjs.24.2.03 ◽

2021 ◽

Vol 24 (2) ◽

pp. 14-20

Author(s):

Rania Kareem Hameed ◽

◽

Mehdi Salih Shihab ◽

Keyword(s):

Weight Loss ◽

Free Energy ◽

Corrosion Rate ◽

Mild Steel ◽

Corrosion Inhibitors ◽

Organic Molecules ◽

Inhibition Efficiency ◽

Pyridinium Salts ◽

Inhibitor Concentration ◽

Pyridinium Bromide

Some new pyridinium salts, namely 4-(4-Chloro-benzylidene-hydrazinocarbonyl)-1-phenyl-pyridinium bromide, C1; 4-(4-Chloro-benzylidene-hydrazinocarbonyl)-1-butyl-pyridinium bromide, C2; 4-(4-Chloro-benzylidene-hydrazinocarbonyl)-1-phencyl-pyridinium bromide, C3; were synthesized and Corrosion inhibitors for mild steel were tested in a 1M H2SO4aqueous solution at 20ºC for 24 hours using weight loss measurements. The findings revealed that the inhibition efficiency of all pyridinium bromide derivatives converges at the maximum concentration. An increase in inhibitor concentration is associated with a decrease in corrosion rate, an increase in inhibition efficiencies, and an increase in surface degree of coverage. The physisorption effects for (C1, C2, and C3) were revealed by the free energy values of adsorption, which provided useful information for predicting the interaction between the metal surface and organic molecules as corrosion inhibitors.

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Efficiency of Ketapang (Terminalia catappa L.) Leaves Tannin Extract as Organic Inhibitor Against Corrosion Rate of Iron Metal in Seawater

Journal of Technomaterials Physics ◽

10.32734/jotp.v2i1.5268 ◽

2020 ◽

Vol 2 (1) ◽

pp. 63-69

Author(s):

Eddy Marlianto

Keyword(s):

Corrosion Rate ◽

Immersion Time ◽

Leaf Extract ◽

Sea Water ◽

Corrosive Media ◽

Terminalia Catappa ◽

Iron Metal ◽

Ferrous Metals ◽

Seawater Environment ◽

Organic Inhibitor

The research is about effect of immersion time and mechanical properties on the rate of corrosion of ferrous metals by the addition of Ketapang (Terminalia catappa L.) leaf extract as an organic inhibitor in the seawater environment. In this study, ketapang leaf extract was used as a natural inhibitor to inhibit the rate of corrosion of ferrous metals. This inhibitor is used on iron metal plates which are immersed in corrosive media, namely sea water with variations in the composition of the inhibitors used at 0; 10% V; 20% V, and 40% V, with immersion time of 3 and 6 days. The characterizations tested included measurement of density, corrosion rate, inhibitor efficiency, and hardness testing using the Vickers method. From the measurement results, the density value decreases with the addition of the concentration of the inhibitor both on immersion 3 days and 6 days. The value of hardness increases with increasing composition of the inhibitor. The optimum hardness value is 165.03 N/m2 with immersion time of 6 days at an inhibitor concentration of 40% and a minimum hardness value of 145.603 N/m2 on immersion 6 days with no inhibitor. The smallest corrosion rate was obtained by samples with a composition of 40% inhibitor of 2.77 mpy with immersion time of 3 days and 1.33 mpy with immersion time of 6 days. And the efficiency value of Ketapang leaf extract inhibitors reached 47.01 % in the composition of 40% in the seawater environment with immersion time of 6 daysketapang leaves

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Adsorption and corrosion inhibition characteristics of two medicinal molecules

10.31221/osf.io/w7s8e ◽

2019 ◽

Author(s):

Chem Int

Keyword(s):

Hydrochloric Acid ◽

Corrosion Rate ◽

Mild Steel ◽

Corrosion Inhibition ◽

Half Life ◽

Thermodynamic Data ◽

Inhibition Efficiency ◽

Gravimetric Method ◽

Corrosive Environment ◽

Corrosion Inhibition Efficiency

The corrosion inhibition characteristics of two medicinal molecules phenylalanine and rutin on mild steel in 1.0M Hydrochloric acid were evaluated using gravimetric method. Corrosion inhibition efficiency of 83.78 and 90.40 % was obtained respectively after seven days. However, phenylalanine showed weak accumulative higher corrosion inhibition efficiency. The presence of both molecules in the corrosive environment reduced the corrosion rate constant and increased the material half-life. Thermodynamic data calculated suggests a spontaneous adsorption of the molecules on the mild steel’s surface.

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Inhibition of pipeline steel corrosion in acidic environment using sulphadoxine and pyrimethamine

10.31221/osf.io/854v9 ◽

2019 ◽

Author(s):

Chem Int

Keyword(s):

Inhibition Efficiency ◽

Pipeline Steel ◽

Electrochemical Techniques ◽

Steel Corrosion ◽

Acidic Environment ◽

Inhibitor Concentration ◽

Adsorption Data ◽

Corrosion Inhibition Efficiency ◽

Inhibitive Action ◽

Sulphadoxine Pyrimethamine

The anti-corrosive properties of sulphadoxine + pyrimethamine (S+P) on the corrosion of pipeline steel in acidic environment were investigated using electrochemical techniques. The results obtained showed an excellent inhibition efficiency which increased with increase in inhibitor concentration. The corrosion inhibition efficiency increased up to 99.04 % at 0.01M S+P and decreased with rise in temperature down to 85.93 % at 333 K and 0.01 M S+P, suggesting a physiosorptive mechanism of adsorption. Also the adsorption data was fitted into Langmuir and Temkin adsorption isotherms, while the inhibitive action was shown to proceed by mixed inhibition mode.

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