Highly durable macromolecular epoxy resin as anticorrosive coating material for carbon steel in 3% NaCl: Computational supported experimental studies

Two derivatives of Iimidazolidin 4-one (IMID4) and Oxazolidin 5-one (OXAZ5), were investigated as corrosion inhibitors of corrosion carbon steel in sea water by employing the theoretical and experimental methods. The results revealed that they inhibit the corrosion process and their %IE followed the order: IMID4 (89.093%) > OXAZ5 (80.179%). The %IE obtained via theoretical and experimental methods were in a good agreement with each other. The thermodynamic parameters obtained by potentiometric polarization measurements have supported a physical adsorption mechanism which followed Langmuir adsorption isotherm. Quantum mechanical method of Density Functional Theory (DFT) of B3LYP with a level of 6-311++G (2d, 2p) were used to calculate the geometrical structure, physical properties and inhibition efficiency parameters, in vacuum and two solvents (DMSO and H2O), all calculated at the equilibrium geometry, and correlated with the experimental %IE. The local reactivity has been studied through Mulliken charges population analysis. The morphology of the surface changes of carbon steel were studied using SEM and AFM techniques.

Download Full-text

Theoretical and Experimental Studies for Inhibition Potentials of Imidazolidine 4-One and Oxazolidine 5-One Derivatives for the Corrosion of Carbon Steel in Sea Water

10.9734/bpi/mono/978-93-91882-61-7/ch8 ◽

2021 ◽

pp. 104-124

Author(s):

Rehab M. Kubba ◽

Nada M. Al-Joborry ◽

Naeemah J. Al-Lami

Keyword(s):

Carbon Steel ◽

Sea Water ◽

Experimental Studies

Download Full-text

Polymeric-Based Epoxy Cured with a Polyaminoamide as an Anticorrosive Coating for Aluminum 2024-T3 Surface: Experimental Studies Supported by Computational Modeling

Journal of Bio- and Tribo-Corrosion ◽

10.1007/s40735-019-0251-7 ◽

2019 ◽

Vol 5 (3) ◽

Cited By ~ 18

Author(s):

O. Dagdag ◽

R. Hsissou ◽

A. Berisha ◽

H. Erramli ◽

O. Hamed ◽

...

Keyword(s):

Computational Modeling ◽

Experimental Studies ◽

Anticorrosive Coating

Download Full-text

Corrosion in CO2 Systems with Impurities Creating Strong Acids

CORROSION ◽

10.5006/3110 ◽

2019 ◽

Vol 75 (11) ◽

pp. 1307-1314

Author(s):

Bjørn H. Morland ◽

Morten Tjelta ◽

Arne Dugstad ◽

Gaute Svenningsen

Keyword(s):

Sulfuric Acid ◽

Carbon Steel ◽

Stainless Steels ◽

Elemental Sulfur ◽

Experimental Studies ◽

Visual Observation ◽

Low Concentrations ◽

Strong Acids ◽

Safety And Environment

There are several proposed specifications for CO2 transport regarding how much impurities that can be allowed in the CO2 stream. Many of these specifications are based on health, safety, and environment (HSE) considerations in case of accidental spill, and only limited focus has been on the pipeline integrity. Previous work has demonstrated that many of the impurities that are expected to be present in CO2 captured from flue gasses may react and form corrosive species. The present paper studied impurity reactions and corrosion under simulated transport conditions (25°C and 10 MPa of CO2). An experiment was performed in a transparent autoclave which allowed for in situ visual observation. Chemical reactions between the impurities were observed even at very low concentrations (<100 ppmv). These reactions contributed to the production of nitric and sulfuric acid together with formation of elemental sulfur. Corrosion was observed on coupons of carbon steel, but not on stainless steels. The corrosion rate of carbon steel was low, but the amount of acids and solids (corrosion products) produced cannot be accepted from a pipeline integrity perspective. Further experimental studies are needed to determine specific limits for impurity concentrations in captured CO2 for transport.

Download Full-text

Numerical and Experimental Studies on the Development of Variable Density Nanocomposites for Structural Applications

Volume 9: Mechanics of Solids, Structures, and Fluids ◽

10.1115/imece2018-87252 ◽

2018 ◽

Cited By ~ 1

Author(s):

Jayaram R. Pothnis ◽

Dinesh Kalyanasundaram ◽

Suhasini Gururaja

Keyword(s):

Numerical Model ◽

Epoxy Resin ◽

Electric Fields ◽

Experimental Studies ◽

Electrical Characterization ◽

Variable Density ◽

Transient Nature ◽

Structural Applications ◽

Measured Sample ◽

Set Up

Numerical and experimental studies performed to develop nanocomposites with varying carbon nanotube (CNT) alignment density within an epoxy matrix are presented. A 3-D numerical model has been developed that looks at the behavior of CNTs in epoxy resin subjected to non-uniform electric fields by explicitly accounting for electric field coupled with fluid flow and particle motion considering the transient resin viscosity. The transient nature of resin viscosity has been incorporated into the simulation study with data related to resin viscosity variation with time and temperature generated experimentally. The response of CNTs due to the induced dielectrophoretic force was studied using the numerical model. The model facilitated the design of an optimal electrode configuration for the processing of variable density composites. A computer controlled Arduino UNO based circuitry was developed to control supply of voltage to the electrodes during sample fabrication. The circuit was then integrated with AC voltage supply units and the electrode set-up for fabricating the variable density composite samples. Low weight fractions of CNTs (0.05 wt.% and 0.1 wt.%) in epoxy resin were used for the experimental work and preliminary experimental studies were conducted. Electrical characterization results of the variable density nanocomposites indicate over 100% and 30% increase in electrical resistance measured across sample widths in 0.05 wt.% and 0.1 wt.% CNT samples, respectively. The measured sample resistance values confirmed that variation in CNT alignment density was achieved across the samples.

Download Full-text