scholarly journals Passivation of Recirculating Open Water Cooling Systems Using New Organic Passivator

2021 ◽  
Vol 23 (12) ◽  
pp. 375-386
Author(s):  
Mahmoud Abbas ◽  
◽  
M. A. Shahin ◽  
Mohamed M. I. Ahmed ◽  
Magdy Kasem ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Corrosion Rate ◽  
Water System ◽  
Cooling Water ◽  
Protective Layer ◽  
Steel Pipe ◽  
Equilibrium Potential ◽  
Nacl Solution ◽  
Running Water ◽  
Cooling Water System

It is well know that recirculating open cooling water system at metal/ water surface contact appear frequent corrosion products, like scales, foaling and material losses which are have great effect on cooling process. Passivation helps to maintain clean heat transfer surface by inhibiting oxides scales through creating outer passive layer. Passivators are substances which usually have a sufficiently high equilibrium potential and sufficiently low over potential decrease corrosion rate on attainment of passivity. One of the most popular passivator is organic phosphate Phosphinosuccinic oligomer C15H14O4P component (PSO) The study of passivation of carbon steel pipe line in recirculating open cooling water system was the aim of this present work. Maximum efficiency of passivator was determined and surface morphology were investigated using optical, scanning microscopy, phase analysis of the formed protective layer was exam by XRD and EDX. Corrosion in running water with and without PSO at 2 m3/hr flow rate was investigated using corrosion coupon rack. It was found that 200 ppm (PSO) decreases corrosion rate of carbon steel pipe in 3.5% NaCL solution from 23 to 7 mpy in stagnate water corrosion testing, while in running water in 3.5% NaCL solution it decreases from 45 to 18 mpy. XDR showed that the protective layer due to passivation is mainly Magnetite (Fe3O4) compound.

Under-Deposit Corrosion Rate Evaluation in Cooling Water System by Weight Loss, Profilometric and Electrical Resistance Methods

2014 ◽  
Vol 548-549 ◽  
pp. 242-246 ◽  
Author(s):  
K. Rithdang ◽  
P. Wongbunyakul ◽  
P. Jamawatr ◽  
P. Lortrakul ◽  
G. Lothongkum
Keyword(s):  
Weight Loss ◽  
Carbon Steel ◽  
Corrosion Rate ◽  
Electrical Resistance ◽  
Water System ◽  
Cooling Water ◽  
Corrosion Rates ◽  
Cooling Water System ◽  
Rate Evaluation

Under-deposit corrosion in cooling water system is often found in industries. The under-deposit corrosion rate in cooling water system is rarely found in a literature. The mechanism depends on the metal, types of deposit and corrosive species in the cooling water system. In this study, the under-deposit corrosion rates of carbon steel in cooling water at various times were determined by weight loss, profilometric and electrical resistance methods at 40C. From this experiment, these three methods showed the consistent results. The under-deposit corrosion rates of carbon steel were about 0.1-0.2 mm/y.

scholarly journals A STUDY ON PRASEODYMIUM 4-HYDROXYCINNAMATE AS AN INHIBITOR FOR CARBON STEEL IN FRESH COOLING WATER SYSTEM OF CA MAU FERTILIZER PLANT

2018 ◽  
Vol 55 (5B) ◽  
pp. 94
Author(s):  
D. T. Ngan
Keyword(s):  
Carbon Steel ◽  
Surface Analysis ◽  
Film Formation ◽  
Electrochemical Techniques ◽  
Water System ◽  
Cooling Water ◽  
Protective Film ◽  
Fertilizer Plant ◽  
Cooling Water System ◽  
Inhibition Performance

Praseodymium 4-hydroxycinnamate compound has been successfully studied as an effective corrosion inhibitor for carbon steel in 0.1 M NaCl solution using electrochemical techniques and surface analysis. The results of electrochemical techniques indicated that there were the decrease of current density and the appearance of protective film on the steel surface evidencing the presence of inhibitor and the effect of Pr(4OHCin)3 compound depending on its concentration in solution. The surface analysis show a confirmation of the protective film formation which is a result of adsorption between the metal and inhibitor components. In addition, inhibition performance of Pr(4OHCin)3 compound is also compared to the inhibition performance of TRACT 109, which has been added to a fresh cooling water system of Ca Mau fertilizer plant.

Protection of Low Carbon Steel in Industrial Cooling Water System by New Formulation

2020 ◽  
pp. 1-15
Author(s):  
Abdelhadi Rochdi ◽  
Rachid Touir ◽  
Mohamed Ebn Touhami
Keyword(s):  
Carbon Steel ◽  
Immersion Time ◽  
Inhibition Efficiency ◽  
Electrochemical Impedance ◽  
Water System ◽  
Cooling Water ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Cooling Water System ◽  
Ph Range

This chapter studies the operational parameters effects, such as immersion time, corrosion products, and pH, on the inhibition efficiency against corrosion for low carbon steel in simulated cooling water system of the mixture 1 (10-3 M 3-MPOX + 20 ppm CTAB), which corresponds to the best inhibition efficiency. The results show that the corrosion inhibition performance of the studied mixture reinforces with immersion time and has a maximum in the pH range 6.5–7.5. In addition, the analysis of the results shows that there is a dependence of the pH value of the solution and the corrosion current density (icorr). Indeed, a correlation can be established between log (icorr) and the pH using the polynomial equation. Finally, the mixture 1 provides good protection for the attack materials. These studies were evaluated from the polarization curves (PP), electrochemical impedance spectroscopy (EIS).

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