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 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

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.

Electrochemical Behavior of Mg in H3PO4 and Phosphating Solution

2014 ◽  
Vol 1081 ◽  
pp. 318-321 ◽  
Author(s):  
Dao Bing Huang ◽  
Yuan Qiang Tu ◽  
Ting Hu ◽  
Guang Ling Song ◽  
Xing Peng Guo
Keyword(s):  
Corrosion Resistance ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Polarization Curve ◽  
Potentiodynamic Polarization ◽  
Electrochemical Behavior ◽  
Electrochemical Impedance ◽  
Potentiodynamic Polarization Curve

The electrochemical behavior of pure Mg in H3PO4 acid (0.42 M) and phosphating solution (0.42 M H3PO4+0.34 M ZnO) was investigated through electrochemical impedance spectroscopy (EIS), potentiodynamic polarization curve and XRD measurements. The results show that Mg has higher corrosion resistance in the phosphating solution than that in the H3PO4 acid which may be due to the relative protective phosphating film on the surface.

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.

Microbiologically Influenced Corrosion of Fe3Al/ZrO2 Composites in Marine Environment

2009 ◽  
Vol 79-82 ◽  
pp. 2251-2254
Author(s):  
Xue Ting Chang ◽  
Shou Gang Chen ◽  
Yan Sheng Yin
Keyword(s):  
Passive Film ◽  
Polarization Curve ◽  
Potentiodynamic Polarization ◽  
Electrochemical Impedance ◽  
High Hardness ◽  
Impedance Spectrum ◽  
Microbiologically Influenced Corrosion ◽  
Electrochemical Impedance Spectrum ◽  
Potentiodynamic Polarization Curve ◽  
Corrosion Resistant

Electrochemical impedance spectrum (EIS) and potentiodynamic polarization curve were applied to invest the corrosive behavior of Fe3Al/ZrO2 composites with different components in marine microbial medium. The results indicated that the existence of microbiology negatively moved the open circle potential. When the composites contained 30% (wt %) ZrO2, the passive film on electrodes surface was the thickest one, even after 25 days the material was still protected. When the content of ZrO2 was 90%, Fe3Al was in the least content, after 25 days the passive film has disappeared, but the material was still not eroded because of the high hardness and corrosion-resistant properties of ZrO2. When the content of ZrO2 was 80%, the passive film was partly damaged, which could lead to more serious local corrosion.

scholarly journals Effect of anodic dissolution and passivation on X80 steel in NaHCO3 solution

2020 ◽  
Author(s):  
Lai-Shun Yang ◽  
Chao Yang
Keyword(s):  
Anodic Dissolution ◽  
Double Layer ◽  
Formation Mechanism ◽  
Polarization Curve ◽  
Potentiodynamic Polarization ◽  
Electrochemical Reaction ◽  
Stray Current ◽  
Potentiodynamic Polarization Curve ◽  
Anodic Current ◽  
X80 Steel

AbstractThe effects of extreme stray current on the anodic dissolution and passivation of X80 steel in NaHCO3 solution were investigated using measurements of polarization curves and EIS, AFM and SEM techniques. Under the interference of anodic current (i = 0~200 A/m2), main constituents of corrosion products of X80 steel were FeO(OH) and Fe3O4. A double-layer film formed at i = 100 A/m2, in which FeOOH was in outer and Fe3O4 lied in inner. The formation mechanism of Fe3O4 was confirmed and described by the electrochemical reaction in various regions on anodic potentiodynamic polarization curve.

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