scholarly journals Inhibition Effect of Different Corrosion Inhibitors on Steel Bars Corrosion and Improvement Effect After Double Doped

2021 ◽  
Vol 9 (4) ◽  
pp. 105
Author(s):  
Minghui Jiang ◽  
Meiyan Hang ◽  
Yubing Yang ◽  
Teng Cheng ◽  
Hao Wang ◽  
...  
Keyword(s):  
Corrosion Inhibitors ◽  
Inhibition Effect ◽  
Steel Bars ◽  
Improvement Effect

Inhibition effect of monomeric/polymerized imidazole zwitterions as corrosion inhibitors for carbon steel in acid medium

2020 ◽  
Vol 312 ◽  
pp. 113436 ◽  
Author(s):  
Jinghui Wang ◽  
Dan Liu ◽  
Shuyun Cao ◽  
Shiguang Pan ◽  
Hengzhi Luo ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Acid Medium ◽  
Corrosion Inhibitors ◽  
Inhibition Effect

Modification of Ligustrum vulgare Leaves Extract as Eco-Friendly Corrosion Inhibitors in Oil Fields

2019 ◽  
Vol 814 ◽  
pp. 499-504
Author(s):  
Ren Jun Xu ◽  
Hua Lei He ◽  
Ying Li Tang ◽  
Min Lan Gao ◽  
Hai Peng Hui ◽  
...  
Keyword(s):  
Corrosion Inhibition ◽  
Corrosion Inhibitors ◽  
Adsorption Mechanism ◽  
Inhibition Efficiency ◽  
Oil Fields ◽  
Inhibition Effect ◽  
Langmuir Adsorption ◽  
Ligustrum Vulgare ◽  
Main Components ◽  
Dark Green

Ligustrum vulgare is an evergreen tree. The leaves are opposite, glossy dark green, 6–17 centimetres (2.4–6.7 in) long and 3–8 centimetres (1.2–3.1 in) broad. The ligustrum vulgare leaves contain two main components, one of which is oleanolic acid and the other is p-hydroxyphenylethanol which indicates its extracts suitable to be used as an effective corrosion inhibitor. Extracts of ligustrum vulgare leaves (PE) were modified with hydroxymethylation reaction (PM1) and Mannich reaction (PM2) to produce the relative stable green acidic corrosion inhibitors. The extracts of ligustrum vulgare leaves have been investigated on the corrosion inhibition of A3 steel with weight loss. The results show that these inhibitors have good corrosion inhibition effect on A3 steel. The PM2 are the most effective for corrosion inhibition, and the inhibition efficiency can reach 75.95%. When the temperature is 60°C, the corrosion inhibition rate of PE, PM1, PM2 is only 24.46%, 42.35% and 39.35% respectively which can not effectively prevent the corrosion of the metal. And the extracts inhibit corrosion mainly by adsorption mechanism. This adsorption accords with Langmuir adsorption isotherm.

The Effect of Corrosion Inhibitor in Hydrofluoric Acid Medium

2013 ◽  
Vol 750-752 ◽  
pp. 2258-2262 ◽  
Author(s):  
Wei Ming Wu ◽  
Ding Li ◽  
Hai Yan Du
Keyword(s):  
Weight Loss ◽  
Corrosion Resistance ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Mild Steel ◽  
Hydrofluoric Acid ◽  
Corrosion Inhibitors ◽  
Electrochemical Impedance ◽  
Potassium Thiocyanate ◽  
Inhibition Effect

The experiments were done to find some good corrosion inhibitors for mild steel in 5% HF solution by the method of weight loss and electrochemistry including polarization curves and electrochemical impedance spectroscopy (EIS). Results show that the thiourea, potassium thiocyanate, and hexamethylenetetramine have good inhibition effect for mild steel in 5% HF solution, especially potassium thiocyanate and thiourea. Their corrosion resistance was greatly enhanced in the presence of tested inhibitor. Thiourea is an anodic type inhibitor and its inhibition efficiencies up to 99.88% can be obtained. Equivalent circuit of the investigated system was suggested.

scholarly journals Ground Improvement. Effect of Steel Bars Reinforcement on Slope Stability.

1998 ◽  
Vol 47 (2) ◽  
pp. 140-143
Author(s):  
Kazuhiko NISHIDA ◽  
Tatsuaki NISHIGATA
Keyword(s):  
Slope Stability ◽  
Ground Improvement ◽  
Steel Bars ◽  
Improvement Effect

scholarly journals Research on Inhibiting Performance of Compound Corrosion Inhibitors Based on Nitrite

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Bing Yi ◽  
Jianmin Wang ◽  
Liyu Feng ◽  
Yilin Song ◽  
Junzhe Liu ◽  
...  
Keyword(s):  
Corrosion Inhibitors ◽  
Concrete Surface ◽  
Inhibitory Effect ◽  
Test Methods ◽  
Hydrogen Phosphate ◽  
Composite Repair ◽  
Inhibition Effect ◽  
Rebar Corrosion ◽  
Macrocell Corrosion ◽  
Low Dosage

To solve rebar corrosion in existing concrete structures, two test methods, adding corrosion inhibitors into concrete and applying corrosion inhibitors on the existing concrete surface by brushing and pouring and composite repair, combined with natural potential, XRD and SEM, were used to comprehensively evaluate the performance of nitrite-based compound corrosion inhibitors. The research results show that nitrite has a better inhibitory effect than phosphate, and when the respective mass fraction of hydrogen phosphate and sodium nitrite is about 1.5%, the rust inhibition effect is the optimum. Brushing, perfusion, and composite repair can all play a good role in inhibiting corrosion of which composite repair is the best. The addition of phosphate can improve the macrocell corrosion caused by the low dosage or uneven distribution of nitrite.

The study of thiadiazole derivatives as potential corrosion inhibitors of low-carbon steel in hydrochloric acid

2021 ◽  
Vol 103 (3) ◽  
pp. 93-102
Author(s):  
M.D. Plotnikova ◽  
◽  
A.B. Shein ◽  
M.G. Shcherban` ◽  
A.D. Solovyev ◽  
...  
Keyword(s):  
Weight Loss ◽  
Acetic Acid ◽  
Corrosion Inhibitors ◽  
Acid Corrosion ◽  
Low Carbon Steel ◽  
Corrosion Current ◽  
Low Carbon ◽  
Inhibition Effect ◽  
Weight Loss Method ◽  
Thiadiazole Derivatives

The inhibition effect of series of thiadiazole derivatives against the corrosion of mild steel in 15 % HCl was studied by weight-loss method and electrochemical measurements. The experiments were performed on steel St3 at 293 K, the exposure time of the samples in solution for weight-loss measurements was 24 h. Potentiodynamic polarization curves were obtained in a typical three electrode cell with the help of electrochemical measuring complex SOLARTRON 1280 C. A scan rate was 1 mV⋅s-1 and a measurement point was taken every 0.2 s. 2-aminothiazole, 5-amino-1,3,4-thiadiazole-2-thiol, 2-amino-1,3,4-thiadiazole, 2-amino-5-(furan-2-yl)- 1,3,4-thiadiazole, 1,3,4-thiadiazole-2-ylamide of acetic acid were studied as potential inhibitors. The maximal inhibition efficiency was obtained at concentration 0.10-0.20 g⋅L−1. The best result was demonstrated by 5-amino-1,3,4-thiadiazole-2-thiol (inhibition effect was more than 90 %). The minimal inhibition effect had 1,3,4-thiadiazole-2-ylamide acetic acid. The corrosion inhibition effect calculated from data of the corrosion current density and from the weight-loss measurements were in sufficiently good agreement. The effective activation energy of the corrosion of St3 increased significantly due the presence of the inhibitors (from 3.3 to 94.8 kJ⋅mol-1). The results point to promising of investigating of series of thiadiazole derivatives and inhibitory compositions based on thiadiazole as potential acid corrosion inhibitors.

Comparative Inhibition Effect of Synthesized Fatty Amides Mixture, Pyridine and Pyrrole on Carbon Steel in Saline Environment

2014 ◽  
Vol 575 ◽  
pp. 206-209 ◽  
Author(s):  
Izni Mariah Ibrahim ◽  
Junaidah Jai ◽  
Md Amin Hashim
Keyword(s):  
Corrosion Inhibitors ◽  
Saline Water ◽  
Carbon Steels ◽  
Saline Environment ◽  
Inhibition Effect ◽  
Linear Polarization Resistance ◽  
Fatty Amides ◽  
Chain Lengths ◽  
Better Than ◽  
Polarization Resistance Method

The inhibition effect of synthesized fatty amides mixture, pyridine and pyrrole as corrosion inhibitors on carbon steels in saline water had been compared using Linear Polarization Resistance Method (LPRM). It is still unknown which of these organics performed best than another. The experimental results showed that the inhibition effect of the synthesized fatty amides mixture is found to be better than pyridine and pyrrole, indicating the presence of various chain lengths of fatty amides molecules. These molecules provide a better surface on carbon steels than pyrrole and pyridine.

Experimental Study on the Water Penetration into Mortar under Water Pressure Condition

2008 ◽  
Vol 385-387 ◽  
pp. 681-684 ◽  
Author(s):  
Joh Yeong Yoo ◽  
Han Seung Lee ◽  
Young Jin Kim
Keyword(s):  
Experimental Study ◽  
Corrosion Inhibitors ◽  
Water Pressure ◽  
Applied Pressure ◽  
Pressure Condition ◽  
Water Penetration ◽  
Moisture Migration ◽  
Steel Bars ◽  
Conventional Technology ◽  
Corrosion Of Steel

Concrete is a type of porous materials and is physically and chemically damaged due to exposure to various environments from the placing to the service life. These reactions affect the corrosion of steel bars applied in concrete and that decreases the durability life and strength of such steel bars. Thus, it is very important to insert rust inhibitors into steel bars in the case of a deterioration element that exceeds the critical amount of corrosion in the location of steel bars. However, it is very difficult to guarantee corrosion resistance at the location of steel bars using conventional technology that applies corrosion inhibitors only on the surface of concrete. This study attempts to develop a method that penetrates corrosion inhibitors up to the location of steel bars and investigate the penetration depth of corrosion inhibitors by verifying moisture migration in concrete under an applied pressure.

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