Some Experiences With Sodium Silicate As a Corrosion Inhibitor in Industrial Cooling Waters★

CORROSION ◽  
1957 ◽  
Vol 13 (11) ◽  
pp. 41-46 ◽  
Author(s):  
J. W. WOOD ◽  
J. S. BEECHER ◽  
P. S. LAURENCE
Keyword(s):  
Sodium Silicate ◽  
Normal Development ◽  
Cooling Water ◽  
Low Carbon Steel ◽  
Control Agent ◽  
Low Carbon ◽  
Silica Films ◽  
Influence Of Ph ◽  
Inhibitive Action

Abstract The use of sodium silicate as a corrosion control agent for open-recirculating cooling water systems is discussed. Emphasis is placed on the results of tests made with low-carbon steel coupons in eight operating plants. The normal development of silica films, effect of prior corrosion and the influence of pH, water temperature and magnesium hardness are discussed. Long-term test data indicated that crystalloidal silica is highly effective in stopping corrosion of mild steel by a wide variety of industrial cooling waters. Thirty to forty ppm of total crystalloidal silica provided adequate protection in waters containing upwards of 500 ppm of chlorides and sulfates. Magnesium hardness in concentrations above 250 ppm as CaCOa was found to greatly reduce the inhibitive action. 5.8.2

Influence of Iron Bacteria on the Corrosion Behavior of Carbon Steel: SEM Study

2013 ◽  
Vol 65 (1) ◽  
Author(s):  
E. Hamzah ◽  
C. L. Khohr ◽  
Ahmad Abdolahi ◽  
Z. Ibrahim
Keyword(s):  
Carbon Steel ◽  
Cooling Water ◽  
Low Carbon Steel ◽  
Iron Hydroxides ◽  
Low Carbon ◽  
X Ray Diffraction ◽  
X Ray ◽  
Iron Bacteria ◽  
Microbially Influenced Corrosion ◽  
Sem Study

In this work, the iron bacteria were cultured and inoculated into the cooling water before immersion, and low carbon steel coupons were immersed for one month. Then, microbially influenced corrosion (MIC) of carbon steel in the presence of these bacteria was investigated using scanning electron microscopy (SEM), x-ray diffraction spectroscopy (XRD) and weight loss methods. SEM results showed that large amounts of corrosion products and heterogeneous biofilm layer were formed on the coupon surface. SEM also revealed the uniform-pitting corrosion on the steel surface due to bacteria colonization. XRD results show that the main constituents present in corrosion product are composed of iron oxides and iron hydroxides. 

scholarly journals Performance of Methyl-5-Benzoyl-2-Benzimidazole Carbamate (Mebendazole) as Corrosion Inhibitor for Mild Steel in Dilute Sulphuric Acid

2020 ◽  
Vol 2020 ◽  
pp. 1-11 ◽  
Author(s):  
F. O. Edoziuno ◽  
A. A. Adediran ◽  
B. U. Odoni ◽  
M. Oki ◽  
P. P. Ikubanni ◽  
...  
Keyword(s):  
Mild Steel ◽  
Inhibition Efficiency ◽  
Elevated Temperatures ◽  
Physical Adsorption ◽  
Electrochemical Techniques ◽  
Low Carbon Steel ◽  
Gravimetric Analysis ◽  
Low Carbon ◽  
Maximum Inhibition ◽  
Inhibitive Action

The inhibitive effect of mebendazole (MBZ) on the corrosion of low-carbon steel in H2SO4 was investigated by gravimetric and electrochemical techniques as well as examination of specimens in the scanning electron microscope with attached energy dispersive X-ray spectrometer (EDS). From gravimetric analysis, the highest inhibition efficiency of about 96.6% was obtained for 1.0 g of inhibitor in H2SO4 solution at 24 h, while with longer exposure times of between 72 to 120 h, the efficiencies averaged between 92 and 95%. Tafel extrapolations from the polarization curves showed that 1.0 g MBZ gave a maximum inhibition efficiency of approximately 99% for the investigation conducted at 30°C, whereas 1.5 g of MBZ gave a maximum inhibition efficiency of about 85% at 60°C. Inhibition efficiency increased with increasing concentrations of MBZ and decreased at elevated temperatures. The inhibitive action was attributed to physical adsorption of MBZ species on the mild steel surface which followed the Langmuir adsorption isotherm. MBZ performed as a mixed-type inhibitor on mild steel in dilute H2SO4.

High-cycle fatigue failure of low-carbon steel after long-term aging

2010 ◽  
Vol 46 (14) ◽  
pp. 1570-1577 ◽  
Author(s):  
L. R. Botvina ◽  
I. M. Petrova ◽  
I. V. Gadolina ◽  
V. P. Levin ◽  
Yu. A. Demina ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Fatigue Failure ◽  
High Cycle Fatigue ◽  
Low Carbon Steel ◽  
Cycle Fatigue ◽  
Low Carbon

scholarly journals Stress Induced in Low Carbon Steel Tubes of Kids Bicycle Upon Impact

2019 ◽  
Vol 9 (2S4) ◽  
pp. 199-201
Keyword(s):  
Carbon Steel ◽  
Product Innovation ◽  
New Products ◽  
Low Carbon Steel ◽  
High Rate ◽  
Low Carbon ◽  
Steel Tubes ◽  
A Company ◽  
Continuous Product

The market environment is characterized by keen competition, an oversupply of goods, rapidly shifting tastes and a high rate of product innovation ad obsolescence. The long term profitability or the very survival of a company depends on new products and on commitments to continuous product innovation. Firms are seeking differential advantage and their actions continue to segment large market into smaller sub-segments. There is often a back and forth action between market reconsolidation based on innovation and fragmentation based on competition.

Improvement of Mechanical Properties and Structure Modifications of Low Carbon Steel by Inoculations with Nano-Size Silicon Nitride

2017 ◽  
Vol 47 ◽  
pp. 24-32 ◽  
Author(s):  
Ahmed Shash ◽  
Mohamed K. El-Fawkhry ◽  
Sherif Ali Abd El Rahman ◽  
Iman S. Elmahallawi ◽  
Taha Mattar
Keyword(s):  
Mechanical Properties ◽  
Treatment Process ◽  
Adhesive Wear ◽  
Cold Deformation ◽  
Low Carbon Steel ◽  
Structural Steels ◽  
Low Carbon ◽  
Nano Size ◽  
Lamellar Cementite

AISI 1020 steel is considered to be one of the most applicable structural steels, in particular in the cold drawn form. Heating of this grade of steel prior to AC1 must have been applied to spheroidize the lamellar cementite, and consequently enhances the cold formability character of the steel. Si3N4 nanoinoculation of this grade of steel has been used in this study, where it is added to the molten steel, in order to avoid the high cost long term heat treatment process prior to cold deformation process. Optical microscopy and SEM have been used to evaluate the morphology of cementite after nanoinoculation process with Si3N4. Tensile properties of nanoinoculated steels have been investigated. Finally, wear adhesive resistance of investigated samples has been evaluated. The obtained results showed a great enhancement in the mechanical properties, strength, ductility and adhesive wear resistance, as a result of the nucleation of cementite into a new spheroidal phase and grain refinement by Si3N4 inoculation and allow usage of AISI 1020 steels inoculated by nanoinoculant Si3N4 in further technological applications.

Loading Frequency Effects on the Fatigue Crack Growth Rate and Fracture Surface Morphology of Low Carbon Steel in Case of Long-Term Use in Hydrogen Gas

2011 ◽  
Vol 488-489 ◽  
pp. 323-326
Author(s):  
A. Nishimoto ◽  
Yasuji Oda ◽  
Hiroshi Noguchi
Keyword(s):  
Carbon Steel ◽  
Fracture Surface ◽  
Surface Morphology ◽  
Low Carbon Steel ◽  
Hydrogen Gas ◽  
Loading Frequency ◽  
Fracture Surface Morphology ◽  
Low Carbon ◽  
Frequency Effects

Loading frequency effects on FCGR and fracture surface morphology were investigated on pre-strained low carbon steel in high FCGR range. Loading frequency effects showed the different trend between internal hydrogen and environmental hydrogen. The effects of combined condition hydrogen revealed similar tendency of environmental hydrogen.

Long-term strain-ageing effects on low-carbon steel reinforcement

2019 ◽  
Vol 228 ◽  
pp. 116606 ◽  
Author(s):  
Giuseppe Loporcaro ◽  
Stefano Pampanin ◽  
Milo V. Kral
Keyword(s):  
Carbon Steel ◽  
Low Carbon Steel ◽  
Steel Reinforcement ◽  
Low Carbon ◽  
Strain Ageing ◽  
Ageing Effects
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