Corrosion inhibitors for acid cleaning of desalination heat exchangers: Progress, challenges and future perspectives

2019 ◽  
Vol 296 ◽  
pp. 111760 ◽  
Author(s):  
I.B. Obot ◽  
Abdelkader Meroufel ◽  
Ikenna B. Onyeachu ◽  
Abdulrahmane Alenazi ◽  
Ahmad A. Sorour
Keyword(s):  
Heat Exchangers ◽  
Corrosion Inhibitors ◽  
Future Perspectives ◽  
Acid Cleaning

scholarly journals Inhibition of Brass Corrosion in Acid Medium Using Thiazoles

2013 ◽  
Vol 14 ◽  
pp. 87-102
Author(s):  
K.K. Taha ◽  
Musa E. Mohamed ◽  
S.A. Khalil ◽  
S.A. Talab
Keyword(s):  
Weight Loss ◽  
Thermal Properties ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Corrosion Rate ◽  
Heat Exchangers ◽  
Corrosion Inhibitors ◽  
Inhibition Efficiency ◽  
Electrochemical Impedance ◽  
Zinc Dissolution

Brass as an alloy composed mainly of copper is great industrial uses such as heat exchangers and similar other facility due to its good thermal properties. Due to the presence of the considerable ratio of zinc the alloy suffers from zinc dissolution or dezincification. Dezincification rate increases with the increase in the ratio of zinc in the alloy. In this study benzothiazole (BTH) and its substituent’s 2-methylbenzothiazole (MeBTH), 2-aminobenzothiazole (ABTH), 2-mercaptobenzothiazole (MBTH) and 2-phenylbenzothiazole (PhBTH) have been used as corrosion inhibitors for α-brass in stirred 0.1 M HClO4. The methods of investigation include weight loss, Tafel and linear polarizations and electrochemical impedance spectroscopy. The order of inhibition efficiency (%E) was calculated and the values obtained has indicated the sequence of inhibition efficiency was found to be BTH < MeBTH < ABTH < PhBTH < MBTH. The calculated values of thermodynamic parameters support this order. The inhibitors were found to suppress the corrosion rate by the formation of films which were identified by IR, SEM and EDAX techniques.

Progress in the development of sour corrosion inhibitors: Past, present, and future perspectives

2019 ◽  
Vol 79 ◽  
pp. 1-18 ◽  
Author(s):  
I.B. Obot ◽  
Moses M. Solomon ◽  
Saviour A. Umoren ◽  
Rami Suleiman ◽  
Mohamed Elanany ◽  
...  
Keyword(s):  
Corrosion Inhibitors ◽  
Future Perspectives ◽  
Sour Corrosion

Paper 2: Pre-Commission Acid Cleaning of Boilers and Heat Exchangers

1968 ◽  
Vol 183 (15) ◽  
pp. 9-13
Author(s):  
A. W. Gillis
Keyword(s):  
Heat Transfer ◽  
Water Quality ◽  
Heat Exchangers ◽  
Great Increase ◽  
Feed Water ◽  
Oil And Grease ◽  
Acid Cleaning ◽  
Heating Surfaces ◽  
Very High ◽  
Tube Metal

Until the 1950s it was generally sufficient to clean new boilers or heat exchangers before commissioning by boiling out with alkali to remove traces of oil and grease and by subsequent flushing to remove debris. However, with the great increase in heat transfer ratings in recent years, it is shown that deposits a few thousandths of an inch in thickness can cause high internal tube temperatures which in turn can lead to corrosion of the tube metal. It is therefore obvious that the feed water quality must be very high and that it must be treated to maintain correct conditions in the heat exchanger. It is also essential to ensure that the plant enters service in a meticulously clean condition with the minimum layer of magnetite on the heating surfaces to ensure freedom from attack. The method which would be adopted at the present time to acid clean a new boiler is summarized together with precautions which should be taken. In addition, the necessity for laboratory trials before acid cleaning heat exchangers containing exotic materials is emphasized.

scholarly journals Galvanic Sensor for Detecting Corrosion during Acid Cleaning of Magnetite in Steam Boilers

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 343
Author(s):  
Abdullah M. Al-Mayouf ◽  
Matar N. Al-Shalwi
Keyword(s):  
Base Metal ◽  
Corrosion Inhibitors ◽  
Steel Corrosion ◽  
Iron Corrosion ◽  
Acid Cleaning ◽  
Magnetite Layer ◽  
Steam Boilers ◽  
Oxide Removal ◽  
Time Required ◽  
Galvanic Sensor

A simple galvanic sensor was developed to determine the onset of iron corrosion under conditions similar to those used for removing the iron oxide (magnetite) layer from steam boilers with a hy-drochloric acid solution. Since the potentials of magnetite and iron are different, the initiation of the dissolution of the magnetite layer without corroding the base metal can be determined by moni-toring the potential of a sensor made of magnetite layers of different thicknesses that can be placed directly on the iron surface. Moreover, the time at which the addition of corrosion inhibitors is required to protect the base metal can be specified using this sensor. It has been shown that the time required for the iron base metal to start was dependent on the magnetite layer thickness in the sensor. With this sensor, the onset of the steel corrosion during the cleaning can be detected in re-al-time which makes the oxide removal process less harmful to the base metal.

scholarly journals Trends and future perspectives on the integration of phase change materials in heat exchangers

2021 ◽  
Vol 38 ◽  
pp. 102544
Author(s):  
Boniface Dominick Mselle ◽  
Gabriel Zsembinszki ◽  
Emiliano Borri ◽  
David Vérez ◽  
Luisa F. Cabeza
Keyword(s):  
Phase Change ◽  
Heat Exchangers ◽  
Phase Change Materials ◽  
Future Perspectives

Triazines as a potential class of corrosion inhibitors: Present scenario, challenges and future perspectives

2021 ◽  
Vol 321 ◽  
pp. 114747
Author(s):  
Dheeraj Singh Chauhan ◽  
M.A. Quraishi ◽  
W.B. Wan Nik ◽  
Vandana Srivastava
Keyword(s):  
Corrosion Inhibitors ◽  
Future Perspectives
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