Injectable Sodium Bentonite Inhibitors for Corrosion under Insulation

Cullin, Matthew; Birmingham, Grant; Srinivasan, Raghu; Hailu, Getu

doi:10.1061/(asce)ps.1949-1204.0000488

Cited by 3 publications

(2 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In these industries, the corrosion is grown invisibly in the metal substrate under insulation due to the intrinsic coating imperfections, humidity, and water invasion that makes structural thinning [7][8][9]. This structure's weakness can lead to a catastrophic failure on asset integrity which has several adverse consequences, including production losses, maintenance cost, environmental pollution, and personnel risk in terms of health and safety [10][11][12]. Therefore, an accurate and quick inspection for CUI detection is required to avoid the aforementioned consequences and enhance the system's overall integrity.…”

Section: Introductionmentioning

confidence: 99%

Prospect of Using Machine Learning-Based Microwave Nondestructive Testing Technique for Corrosion Under Insulation: A Review

et al. 2022

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Prospect of Using Machine Learning-Based Microwave Nondestructive Testing Technique for Corrosion Under Insulation: A Review

et al. 2022

View full text Add to dashboard Cite

“…CUI inspection in the field requires a complicated and time-consuming process. Existing techniques, such as visual inspection, infrared testing, radiography, moisture detectors, and/or removers, either require the removal of insulation and cladding or cannot give a direct and reliable indication of the corrosion status of the materials [8,[13][14][15]. ASTM standard (G189-07) for laboratory simulation of CUI includes a provision for using a potentiostat to conduct electrochemical polarization resistance measurement under isothermal/cyclic temperature and wet/dry conditions simulating desired conditions in service [16].…”

Section: Introductionmentioning

confidence: 99%

In Situ Monitoring of Corrosion under Insulation Using Electrochemical and Mass Loss Measurements

Yang

Liu

2022

International Journal of Corrosion

View full text Add to dashboard Cite

Corrosion under insulation (CUI) refers to the external corrosion of piping and vessels when they are encapsulated in thermal insulation. To date, very limited information (especially electrochemical data) is available for these “difficult-to-test” CUI conditions. This study was aimed at developing a novel electrochemical sensing method for in situ CUI monitoring and analysis. Pt-coated Ti wires were used to assemble a three-electrode electrochemical cell over a pipe surface covered by thermal insulation. The CUI behavior of X70 carbon steel (CS) and 304 stainless steel (SS) under various operating conditions was investigated using mass loss, linear polarization resistance (LPR), and electrochemical impedance spectroscopy (EIS) measurements. It was found that both the consecutive wet and dry cycles and cyclic temperatures accelerated the progression of CUI. LPR and EIS measurements revealed that the accelerated CUI by thermal cycling was due to the reduced polarization resistance and deteriorated corrosion film. Enhanced pitting corrosion was observed on all tested samples after thermal cycling conditions, especially for CS samples. The proposed electrochemical technique demonstrated the ability to obtain comparable corrosion rates to conventional mass loss data. In addition to its potential for in situ CUI monitoring, this design could be further applied to rank alloys, coatings, and inhibitors under more complex exposure conditions.

show abstract

Performance of a Volatile Corrosion Inhibitor for Mitigating Corrosion Under Insulation

et al. 2023

View full text Add to dashboard Cite

This study evaluated the efficacy of a commercial volatile corrosion inhibitor (VCI) in mitigating the corrosion of carbon steel insulated with mineral wool insulation, especially as a retrofitted solution to CUI management. When VCI was added in dry insulation before the test solution was introduced, severity of CUI was reduced after 14-day exposure. However, when the exposure time was extended to 90 days, no significant mitigation effect was observed. Furthermore, VCI was ineffective when added to pre-corroded insulated systems, indicating that it could not be used as a retrofitted solution to alleviate CUI problems. A separate set of tests with bare steel samples exposed to 10 mL VCI in closed jars showed that VCI was adsorbed on the corrosion products but could not effectively impede the propagation of localized corrosion. The possible influences of insulation jacketing, insulation properties, VCI dosages and dosing methods were also discussed, suggesting the need for further investigations.

show abstract

Injectable Sodium Bentonite Inhibitors for Corrosion under Insulation

Cited by 3 publications

References 17 publications

Prospect of Using Machine Learning-Based Microwave Nondestructive Testing Technique for Corrosion Under Insulation: A Review

Prospect of Using Machine Learning-Based Microwave Nondestructive Testing Technique for Corrosion Under Insulation: A Review

In Situ Monitoring of Corrosion under Insulation Using Electrochemical and Mass Loss Measurements

Performance of a Volatile Corrosion Inhibitor for Mitigating Corrosion Under Insulation

Contact Info

Product

Resources

About