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51317--9721-Use of Micelle Detection for Corrosion Inhibitor Screening

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This paper describes a method of exploiting the critical micelle concentration (CMC) of the corrosion inhibitors to show that the use of CMC can be used as a laboratory screening method for corrosion inhibitor selection.

Product Number: 51317--9721-SG
ISBN: 9721 2017 CP
Author: Melanie Reid
Publication Date: 2017
Industry: Chemical Inhibitors
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Corrosion inhibitors are formulated with surfactants solvents and synergists and applied to mitigate internal corrosion across oil and gas production systems. Candidate corrosion inhibitors for use in these systems are subjected to a series of corrosion mitigation and secondary properties tests. A balance is sought between the product which is most effective for preventing corrosion and that which does not contribute to unwanted effects of dosing such a product including: emulsion formation foaming water haziness etc.The process of determining which the most suitable candidate is may begin with simple linear polarisation resistance and rotating cylinder electrode testing and progress to testing involving high shear temperature and pressure. These tests will be sequentially dosed and the candidates which show the best inhibition at the lowest dose rate are brought forward to emulsion foaming and solubility testing. The dose rate determined by the corrosion rate testing is that which is used for the secondary properties testing. Due to the nature of sequential dosing this dose rate may be higher than the true optimal dose rate and could lead to candidate inhibitors being applied above this dose rate leading to false failures in the secondary property testing phase and otherwise good candidates being dismissed. In this paper we describe a method of exploiting the critical micelle concentration of the corrosion inhibitors to quickly determine the optimal dose rate of each which will allow the best inhibition from that product. We compare this optimal dose rate to that determined by sequential dosing and to secondary property testing to show that the use of critical micelle determination can be used as a laboratory screening method for corrosion inhibitor selection.

Key words: micelle, critical micelle concentration, CMC, corrosion inhibitor, linear polarization resistance

Corrosion inhibitors are formulated with surfactants solvents and synergists and applied to mitigate internal corrosion across oil and gas production systems. Candidate corrosion inhibitors for use in these systems are subjected to a series of corrosion mitigation and secondary properties tests. A balance is sought between the product which is most effective for preventing corrosion and that which does not contribute to unwanted effects of dosing such a product including: emulsion formation foaming water haziness etc.The process of determining which the most suitable candidate is may begin with simple linear polarisation resistance and rotating cylinder electrode testing and progress to testing involving high shear temperature and pressure. These tests will be sequentially dosed and the candidates which show the best inhibition at the lowest dose rate are brought forward to emulsion foaming and solubility testing. The dose rate determined by the corrosion rate testing is that which is used for the secondary properties testing. Due to the nature of sequential dosing this dose rate may be higher than the true optimal dose rate and could lead to candidate inhibitors being applied above this dose rate leading to false failures in the secondary property testing phase and otherwise good candidates being dismissed. In this paper we describe a method of exploiting the critical micelle concentration of the corrosion inhibitors to quickly determine the optimal dose rate of each which will allow the best inhibition from that product. We compare this optimal dose rate to that determined by sequential dosing and to secondary property testing to show that the use of critical micelle determination can be used as a laboratory screening method for corrosion inhibitor selection.

Key words: micelle, critical micelle concentration, CMC, corrosion inhibitor, linear polarization resistance

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