scholarly journals Galvanic Sensor for Detecting Corrosion during Acid Cleaning of Magnetite in Steam Boilers

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 343
Author(s):  
Abdullah M. Al-Mayouf ◽  
Matar N. Al-Shalwi
Keyword(s):  
Base Metal ◽  
Corrosion Inhibitors ◽  
Steel Corrosion ◽  
Iron Corrosion ◽  
Acid Cleaning ◽  
Magnetite Layer ◽  
Steam Boilers ◽  
Oxide Removal ◽  
Time Required ◽  
Galvanic Sensor

A simple galvanic sensor was developed to determine the onset of iron corrosion under conditions similar to those used for removing the iron oxide (magnetite) layer from steam boilers with a hy-drochloric acid solution. Since the potentials of magnetite and iron are different, the initiation of the dissolution of the magnetite layer without corroding the base metal can be determined by moni-toring the potential of a sensor made of magnetite layers of different thicknesses that can be placed directly on the iron surface. Moreover, the time at which the addition of corrosion inhibitors is required to protect the base metal can be specified using this sensor. It has been shown that the time required for the iron base metal to start was dependent on the magnetite layer thickness in the sensor. With this sensor, the onset of the steel corrosion during the cleaning can be detected in re-al-time which makes the oxide removal process less harmful to the base metal.

Biomass Conversion Products as Steel Corrosion Inhibitors

2019 ◽  
Vol 92 (5) ◽  
pp. 620-624
Author(s):  
V. I. Mishurov ◽  
E. N. Shubina ◽  
V. A. Klushin ◽  
A. A. Chizhikova ◽  
V. P. Kashparova ◽  
...  
Keyword(s):  
Corrosion Inhibitors ◽  
Biomass Conversion ◽  
Steel Corrosion

NATURAL CORROSION INHIBITORS FOR STEEL REINFORCEMENT IN CONCRETE — A REVIEW

2015 ◽  
Vol 22 (03) ◽  
pp. 1550040 ◽  
Author(s):  
PANDIAN BOTHI RAJA ◽  
SEYEDMOJTABA GHOREISHIAMIRI ◽  
MOHAMMAD ISMAIL
Keyword(s):  
Reinforced Concrete ◽  
Corrosion Inhibitors ◽  
Construction Materials ◽  
Steel Corrosion ◽  
Vital Role ◽  
Prevention Measures ◽  
Main Culprit ◽  
Chloride Attack ◽  
Reinforced Steel ◽  
Metal Protection

Reinforced concrete is one of the widely used construction materials for bridges, buildings, platforms and tunnels. Though reinforced concrete is capable of withstanding a large range of severe environments including marine, industrial and alpine conditions, there are still a large number of failures in concrete structures for many reasons. Either carbonation or chloride attack is the main culprit which is due to depassivation of reinforced steel and subsequently leads to rapid steel corrosion. Among many corrosion prevention measures, application of corrosion inhibitors play a vital role in metal protection. Numerous range of corrosion inhibitors were reported for concrete protection that were also used commercially in industries. This review summarizes the application of natural products as corrosion inhibitors for concrete protection and also scrutinizes various factors influencing its applicability.

scholarly journals Inhibition of Pipeline Steel Corrosion in 0.5 M H2SO4 Using Cotyledon of Chrysophyllum Albidum

2020 ◽  
Vol 24 (4) ◽  
pp. 691-697
Author(s):  
E.P. Othaki ◽  
N.C. Ngobiri
Keyword(s):  
Corrosion Inhibitors ◽  
Inhibition Efficiency ◽  
Adsorption Process ◽  
Pipeline Steel ◽  
Steel Corrosion ◽  
Langmuir Adsorption ◽  
Extract Concentration ◽  
Ir Studies ◽  
Ft Ir ◽  
As Adsorption

The corrosion inhibition characteristics of Chrysophyllum albidum cotyledon extract was studied as a green and sustainable corrosion inhibitors for pipeline steel in acidic environment attemperatures, 303,313 and 323K using gravimetric technique.The results obtained showed that the inhibition efficiency increased with increase in extract concentration but decrease with increase in temperature. The extract attained an inhibition efficiency of 94 % with 5 g/L at 303 K and 52.2 % with 1 g/L at 333K. Also increase in concentration of the extract lead to increase in activation energydepicting an exothermic process.Fourier transform infrared spectroscopy (FT-IR) studies showed the mode of inhibition as adsorption of phytochemicals from the extract on pipeline steel surface. Langmuir adsorption isotherm best fitted into the adsorption process which is spontaneous and physical. Keywords: Chrysophyllum albidum, Pipeline steel, Inhibition, Adsorption.

Reactivity and Fe complexation analysis of a series of quinoxaline derivatives used as steel corrosion inhibitors

2019 ◽  
Vol 31 (2) ◽  
pp. 631-645 ◽  
Author(s):  
Z. El Adnani ◽  
M. Mcharfi ◽  
M. Sfaira ◽  
M. Benzakour ◽  
A. T. Benjelloun ◽  
...  
Keyword(s):  
Corrosion Inhibitors ◽  
Steel Corrosion ◽  
Quinoxaline Derivatives

Electrochemical Studies of some New Mannich Bases Compounds as Corrosion Inhibitors for Mild Steel in Acidic Media

2012 ◽  
Vol 538-541 ◽  
pp. 2329-2333 ◽  
Author(s):  
Hui Xia Feng ◽  
Jian Li ◽  
Xiao Hong Gao
Keyword(s):  
Mild Steel ◽  
Corrosion Inhibition ◽  
Corrosion Inhibitors ◽  
Steel Corrosion ◽  
Mannich Bases ◽  
Maximum Efficiency ◽  
Tafel Polarization ◽  
Mild Steel Corrosion ◽  
Polarization Studies ◽  
Inhibition Property

The corrosion inhibition behaviour of four selected Mannich bases compounds,namely 3-((N-methyl,N-phenyl)-methyl)2,4-Acetylacetone(MPMAA),3-((N-phenyl)-methyl) 2,4-Acetylacetone (PMAA),3-((N, N-diethyl)-methyl) 2, 4-Acetylacetone(DMAA) and 3-((N, N-methyl)-methyl) 2, 4-Acetylacetone (MMAA) as corrosion inhibitors for mild steel in 1M HCl solutions. Tafel polarization methods were performed to determine the corrosion parameters and inhibition efficiencies. Experimental results showed that PMAA is an excellent inhibitor for mild steel corrosion in 1M HCl solutions; showing a maximum efficiency 92.3% at concentration of 40mg/L. Polarization studies showed that the Mannich bases compounds can be regarded as mixed-type inhibitors and the inhibition efficiency of the four inhibitors followed the order PMAA > MPMAA > DMAA > MMAA. Then scanning electron microscope (SEM)techniques were also employed to examine the mechanism of corrosion inhibition property.

5-Arylpyrimido-[4,5-b]quinoline-diones as new and sustainable corrosion inhibitors for mild steel in 1 M HCl: a combined experimental and theoretical approach

RSC Advances ◽  
2016 ◽  
Vol 6 (19) ◽  
pp. 15639-15654 ◽  
Author(s):  
Chandrabhan Verma ◽  
L. O. Olasunkanmi ◽  
I. B. Obot ◽  
Eno E. Ebenso ◽  
M. A. Quraishi
Keyword(s):  
Molecular Dynamics ◽  
Weight Loss ◽  
Molecular Dynamics Simulation ◽  
Mild Steel ◽  
Quantum Chemical ◽  
Corrosion Inhibitors ◽  
Steel Corrosion ◽  
Dynamics Simulation ◽  
Simulation Methods ◽  
Mild Steel Corrosion

The inhibition of mild steel corrosion in 1 M HCl by four 5-arylpyrimido-[4,5-b]-quinoline-diones has been investigated using weight loss, electrochemical, surface, and quantum chemical calculations and molecular dynamics simulation methods.

Studies on carbon steel corrosion in molybdate and silicate solutions as corrosion inhibitors

1991 ◽  
Vol 247 (2-3) ◽  
pp. 352-359 ◽  
Author(s):  
Jiann-Ruey Chen ◽  
Huei-Yun Chao ◽  
Yuh-Lin Lin ◽  
Iua-Jou Yang ◽  
Jung-Chou Oung ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Corrosion Inhibitors ◽  
Steel Corrosion
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