Electrochemical investigations on pitting corrosion inhibition of mild steel by provitamin B5 in circulating cooling water

2016 ◽  
Vol 202 ◽  
pp. 262-268 ◽  
Author(s):  
M.A. Deyab
Keyword(s):  
Mild Steel ◽  
Corrosion Inhibition ◽  
Pitting Corrosion ◽  
Cooling Water ◽  
Circulating Cooling Water

scholarly journals Experimental study on scale and corrosion inhibition of circulating cooling water in power plant

2020 ◽  
Vol 474 ◽  
pp. 052104
Author(s):  
Shiyu Zhou ◽  
Chunbo Zhang ◽  
Jianxin Zhang ◽  
Xiyang Liu ◽  
Jingting Hu ◽  
...  
Keyword(s):  
Experimental Study ◽  
Power Plant ◽  
Corrosion Inhibition ◽  
Cooling Water ◽  
Circulating Cooling Water

scholarly journals Improvement in Corrosion Inhibition Efficiency of Molybdate-Based Inhibitors via Addition of Nitroethane and Zinc in Stimulated Cooling Water

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Saeed Mohammadi ◽  
Fatemeh Baghaei Ravari ◽  
Athareh Dadgarinezhad
Keyword(s):  
Electron Microscopy ◽  
Weight Loss ◽  
Mild Steel ◽  
Corrosion Inhibition ◽  
Inhibition Efficiency ◽  
Cooling Water ◽  
Ac Impedance ◽  
Uniform Corrosion ◽  
Corrosion Inhibition Efficiency ◽  
Zinc Inhibition

An investigation was conducted to improve the corrosion inhibition efficiency of molybdate-based inhibitors for mild steel which is the main construction material of cooling water systems, using nitroethane as an organic compound beside zinc. In this study a new molybdate-based inhibitor was introduced with the composition of 60 ppm molybdate, 20 ppm nitrite, 20 ppm nitroethane, and 10 ppm zinc. Inhibition efficiency of molybdate alone and with nitrite, nitroethane, and zinc on the uniform corrosion of mild steel in stimulated cooling water (SCW) was assessed by electrochemical techniques such as potentiodynamic polarization and electrochemical impedance (AC impedance) measurements. Weight loss measurements were made with coupon testing specimens in the room temperature for 48 h. Studies of electron microscopy, including scanning electron microscopy (SEM) photograph and X-ray energy dispersive spectrometry (EDS) microanalysis, were used. The results obtained from the polarization and AC impedance curves were in agreement with those from the corrosion weight loss results. The results indicate that the new inhibitor is as effective as molybdate alone, though at one-ninth of the concentration range of molybdate, which is economically favorable.

scholarly journals Effect of nitrate ion on corrosion inhibition of mild steel in simulated cooling water

2010 ◽  
Vol 14 (2) ◽  
Author(s):  
Siragul Karim ◽  
C. M. Mustafa ◽  
Md. Assaduzzaman ◽  
Mayeedul Islam
Keyword(s):  
Mild Steel ◽  
Corrosion Inhibition ◽  
Cooling Water ◽  
Nitrate Ion

Cooling Water Screening Test of Corrosion and Scale Inhibitors

2011 ◽  
Vol 694 ◽  
pp. 794-798
Author(s):  
Mo Jie Sun ◽  
Yu Lei ◽  
Li Juan Xi ◽  
Yong Hua Liu ◽  
Xu Wang
Keyword(s):  
Power Plant ◽  
Corrosion Inhibition ◽  
Screening Test ◽  
Cooling Water ◽  
Scale Inhibitor ◽  
Circulating Cooling Water

Through to a certain power plant circulating cooling water do laboratory static scale and corrosion inhibition experiments, identified best dosage of three scale inhibitor A、B and C, which had improved the concentration rate of the circulating cooling water and had played an important role in preventing the circulation cooling water corrosion and scaling.

scholarly journals Corrosion Inhibition of Mild Steel and 304 Stainless Steel in 1 M Hydrochloric Acid Solution by Tea Tree Extract and Its Main Constituents

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5016
Author(s):  
Jae-Yeon Kim ◽  
Inji Shin ◽  
Jai-Won Byeon
Keyword(s):  
Stainless Steel ◽  
Mild Steel ◽  
Corrosion Inhibition ◽  
Pitting Corrosion ◽  
304 Stainless Steel ◽  
Uniform Corrosion ◽  
Tea Tree ◽  
Donor And Acceptor ◽  
Wide Range ◽  
Pharmaceutical Industries

Tea tree extract, containing antioxidant constituents α-terpineol, terpinen-4-ol, and α-terpinene, has a wide range of applications in the cosmetic, food, and pharmaceutical industries. In this study, tea tree extract showed an anticorrosive effect under 1 M HCl solution on mild steel (MS) and 304 stainless steel (STS). Uniform corrosion for MS and pitting corrosion for STS at 298 K were retarded, with inhibition efficiencies of 77% and 86%, respectively. The inhibition of uniform and pitting corrosion was confirmed by scanning electron microscopy and laser scanning confocal microscopy in terms of surface roughness and pitting morphologies. The most effective constituent contributing to the inhibitory performance of tea tree extract was revealed to be α-terpineol, with an inhibition efficiency of 83%. The adsorption of tea tree extract was confirmed by surface characterization analysis using Fourier transform infrared spectroscopy, Raman spectroscopy, and Electrochemical impedance spectroscopy. Interestingly, G- and D-peaks of Raman spectra were detected from the inhibited steels, and this finding is the first example in the corrosion inhibition field. The anticorrosion mechanism can be explained by the formation of organic-Fe complexes on the corroded steel surface via electron donor and acceptor interactions in the presence of an oxygen atom of the hydroxyl group or ether of organic inhibitors.

scholarly journals Synthesis, characterization and corrosion inhibition behavior of 2-aminofluorene bis-Schiff bases in circulating cooling water

RSC Advances ◽  
2020 ◽  
Vol 10 (30) ◽  
pp. 17816-17828 ◽  
Author(s):  
Wenchang Wei ◽  
Zheng Liu ◽  
Chuxin Liang ◽  
Guo-Cheng Han ◽  
Jiaxing Han ◽  
...  
Keyword(s):  
Corrosion Inhibition ◽  
Schiff Bases ◽  
Polarization Curve ◽  
Potentiodynamic Polarization ◽  
Cooling Water ◽  
Potentiodynamic Polarization Curve ◽  
Circulating Cooling Water

Two new bis-Schiff bases, namely 2-bromoisophthalaldehyde-2-aminofluorene (M1) and glutaraldehyde 2-aminofluorene (M2) were synthesized and were characterized, the potentiodynamic polarization curve confirmed that they were anode type inhibitors.

scholarly journals Organic Phosphorus Compounds as Inhibitors of Corrosion of Carbon Steel in Circulating Cooling Water: Weight Loss Method and Thermodynamic and Quantum Chemical Studies

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Liang Liu ◽  
Ting-Ting Cao ◽  
Qi-Wei Zhang ◽  
Chong-Wei Cui
Keyword(s):  
Carbon Steel ◽  
Corrosion Inhibition ◽  
Corrosion Inhibitors ◽  
Inhibition Efficiency ◽  
Organic Phosphorus ◽  
Cooling Water ◽  
Circulating Cooling Water ◽  
Weight Loss Method ◽  
Corrosion Inhibition Efficiency ◽  
Loss Method

Circulating cooling water plays an important role in industrial water use. In this study, the corrosion inhibition effects of PBTCA, HEDP, and ATMP organic phosphorus inhibitors were investigated using the weight loss method by varying the dosage of inhibitors, ClO2 concentrations, and pH values on carbon steel in recirculating cooling water with a low concentration of ClO2 solution. The results showed that the three corrosion inhibitors had a satisfactory corrosion inhibition effect and that corrosion inhibition efficiency is positively correlated with the concentration of organic phosphorus inhibitors and pH. The average corrosion inhibition efficiency of the three inhibitors was about 80% at the concentration of inhibitors = 35 mg/L, pH = 9.0, and the concentration of ClO2 = 7.0 mg/L, of which the single-phosphorus molecular corrosion inhibitor proved to be the best inhibitor. When the ClO2 concentration was 7 mg/L, the corrosion inhibition efficiencies of the three corrosion inhibitors were relatively stable. Using the density functional theory (DFT) algorithm in the Gaussian 09 program, the optimization calculation was completed by the B3LYP/6-31G (d, p) method at the microlevel. The molecular structures of the three organic phosphorus inhibitors and the number of phosphorus-containing atoms were compared to the sustained-release properties. Organic phosphorus inhibitors, as an electronic buffer, not only provided electrons but also received electrons. They formed a complex with iron and zinc ions in water in order to attach to the surface of the carbon steel and to alleviate corrosion. In addition, the adsorption with a metal surface followed the Langmuir adsorption isotherm.

Sign in / Sign up

Export Citation Format

Share Document