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51316-7018-Pmoa - A New Corrosion Inhibitor For Cooling Systems Based On Natural Organic Acid

Picture for Pmoa - A New Corrosion Inhibitor For Cooling Systems Based On Natural Organic Acid
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Corrosion tests have been carried out in dependence of important application parameters, applying electrochemical methods, beaker tests and long term tests in cooling circuit simulating devices. The results show excellent efficiency and significant synergies between the new substance and other inhibitors.

Product Number: 51316-7018-SG
ISBN: 7018 2016 CP
Author: Wolfgang Hater
Publication Date: 2016
Industry: Chemical Inhibitors
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State of the art corrosion inhibitor programs for evaporative cooling systems are based on phosphate, phosphonates, zinc and combinations thereof. Although generally satisfying control of corrosion can be achieved, all programs have drawbacks such as lack of biodegradability and content of heavy metals. Consequently, there is a need for corrosion inhibitors with an improved environmental profile and/or improved performance. This contribution shows the results obtained with a newly developed corrosion inhibitor, phosphorous modified organic acid (PMOA). It is free of heavy metals and has an excellent environmental profile. Corrosion tests have been carried out in dependence of important application parameters, applying electrochemical methods, beaker tests and long term tests in cooling circuit simulating devices. The results show excellent efficiency and significant synergies between the new substance and other inhibitors. Pilot plant studies of a formulation based on the new inhibitor show the same or better performance compared to commercially available products, but a marked reduction of the phosphorous entry into the waste water. The improved performance can be transferred directly into savings. The positive results were confirmed in a cooling water system of a German refinery.

 

Key words: downloadable, corrosion inhibitor, cooling systems, low-phosphorous, environmental friendly, PMOA

State of the art corrosion inhibitor programs for evaporative cooling systems are based on phosphate, phosphonates, zinc and combinations thereof. Although generally satisfying control of corrosion can be achieved, all programs have drawbacks such as lack of biodegradability and content of heavy metals. Consequently, there is a need for corrosion inhibitors with an improved environmental profile and/or improved performance. This contribution shows the results obtained with a newly developed corrosion inhibitor, phosphorous modified organic acid (PMOA). It is free of heavy metals and has an excellent environmental profile. Corrosion tests have been carried out in dependence of important application parameters, applying electrochemical methods, beaker tests and long term tests in cooling circuit simulating devices. The results show excellent efficiency and significant synergies between the new substance and other inhibitors. Pilot plant studies of a formulation based on the new inhibitor show the same or better performance compared to commercially available products, but a marked reduction of the phosphorous entry into the waste water. The improved performance can be transferred directly into savings. The positive results were confirmed in a cooling water system of a German refinery.

 

Key words: downloadable, corrosion inhibitor, cooling systems, low-phosphorous, environmental friendly, PMOA

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02274 EFFECTIVENESS OF CORROSION INHIBITORS IN RETARDING PROPAGATION OF LOCALISED CORROSION

Product Number: 51300-02274-SG
ISBN: 02274 2002 CP
Author: A. Turnbull, D. Coleman, A.J. Griffiths, P.E. Francis, and L. Orkney
Publication Date: 2002
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In many service applications excursions in solution chemistry, temporary loss of inhibitor, or transient increases in temperature may give rise to localised corrosion. To test the return of inhibition when the loss is remedied, the use of an artificial pit has been investigated using simulations of cooling water and of of oil production formation water.
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02276 WHY CORROSION INHIBITORS DO NOT PERFORM WELL IN SOME MULTIPHASE CONDITIONS: A MECHANISTIC STUDY

Product Number: 51300-02276-SG
ISBN: 02276 2002 CP
Author: Hongbin Wang, Hongwei Wang, Hua Shi, Cheolho Kang, and Paul W. Jepson
Publication Date: 2002
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Results of inhibitor performance at slug flow in a 101.6 mm inner diameter horizontal pipeline. Electrochemical Impedance Spectroscopy (EIS) and scanning electrom microscope (SEM) techniques are used to reveal that the strong bubble impact, high shear stress and turbulent intensity are the reasons for a poor performance of inhibitor.
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02288 EVALUATION OF INHIBITOR PERFORMANCE FOR PROTECTION AGAINST LOCALIZED CORROSION

Product Number: 51300-02288-SG
ISBN: 02288 2002 CP
Author: J. Marsh, J. W. Palmer and R. C. Newman
Publication Date: 2002
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 A novel evaluation technique, based on an artificial pit electrode, has been developed for inhibitor studies. The first example is of three generic inhibitors, against localised corrosion. The second is of three industrial inhibitors against existing localised corrosion on a north sea production platform
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