scholarly journals COMPARATIVE BEHAVIOUR OF CORROSION FOR CARBON STEEL IN NHATRANG BAY (VIETNAM) AND VLADIVOSTOK (RUSSIA) SEA WATER

2011 ◽  
Vol 14 (1) ◽  
pp. 65-77
Author(s):  
Xuan Ba Bui ◽  
Kharachenko U. V. ◽  
Beleneva I. A
Keyword(s):  
Carbon Steel ◽  
Mild Steel ◽  
Marine Environment ◽  
Russian Federation ◽  
Sea Water ◽  
East Sea ◽  
Natural Conditions ◽  
Seawater Salinity ◽  
Water Conditions ◽  
Comparative Results

Comparative results of corrosion testing for carbon steel in natural conditions of Nhatrang Bay (East Sea, Vietnam) and Vladivostok (Russian Federation) sea water are presented. It is concluded, that corrosion of carbon mild steel in marine environment of Nhatrang Bay at normal seawater salinity is 1.5 to 2.5 times higher than that in Vladivostoc sea water conditions.

scholarly journals 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

2020 ◽  
pp. 2776-2796
Author(s):  
Rehab M Kubba ◽  
Nada M. Al-Joborry ◽  
Naeemah J. Al-lami
Keyword(s):  
Carbon Steel ◽  
Density Functional ◽  
Sea Water ◽  
Physical Adsorption ◽  
Population Analysis ◽  
Experimental Studies ◽  
Experimental Methods ◽  
Equilibrium Geometry ◽  
Quantum Mechanical Method ◽  
Derivatives Of

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.

scholarly journals Salinity Sensing Characteristics Based on Optical Microfiber Coupler Interferometer

Photonics ◽  
2020 ◽  
Vol 7 (3) ◽  
pp. 77 ◽  
Author(s):  
Lingjun Zhou ◽  
Yang Yu ◽  
Huimin Huang ◽  
Yuyu Tao ◽  
Kui Wen ◽  
...  
Keyword(s):  
Sea Water ◽  
Technical Solution ◽  
Structure Parameters ◽  
Sensor Signal ◽  
Device Structure ◽  
Response Sensitivity ◽  
Reading Error ◽  
Seawater Salinity ◽  
Optical Microfiber ◽  
Sensing Characteristics

In this paper, we report a novel and compact sensor based on an optic microfiber coupler interferometer (OMCI) for seawater salinity application. The OMCI device is fabricated by connecting Faraday rotating mirrors to the two out-ports of the microfiber coupler, respectively. The sensor signal processing is based on a wavelength demodulation technique. We theoretically analyze the sensing characteristics with different device structure parameters. Besides, the results show that the date reading error decreases with the thinner waist region and longer arm difference. Through the experiment, the reflection spectra red-shifted as the sea water salinity increased; the highest response sensitivity of the OMCI salinity sensor reached 303.7 pm/‰ for a range of 16.6–23.8‰, and the resolution was less than 0.03‰. This study provides a new technical solution for the development of practical optical fiber seawater salinity sensors.

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