The extraction of uranium from groundwaters on iron surfaces

2005 ◽  
Vol 461 (2057) ◽  
pp. 1247-1259 ◽  
Author(s):  
Thomas B Scott ◽  
Geoffrey C Allen ◽  
Peter J Heard ◽  
Andrew C Lewis ◽  
Darren F Lee
Keyword(s):  
Mild Steel ◽  
Steel Surfaces

The observation of uranium remediation from groundwater onto mild-steel surfaces is reported. Mechanisms for uranium immobilization are proposed.

The changing topography of corroding mild steel surfaces in seawater

2007 ◽  
Vol 49 (5) ◽  
pp. 2270-2288 ◽  
Author(s):  
Robert Jeffrey ◽  
Robert E. Melchers
Keyword(s):  
Mild Steel ◽  
Steel Surfaces

scholarly journals THERMODYNAMIC PROPERTIES AND CHARACTERIZATIONS OF CHITOSAN NANO-PARTICLES CORROSION INHIBITION ON THE SURFACE OF MILD STEELIN PEAT WATER MEDIA

2016 ◽  
Vol 12 (1) ◽  
pp. 27
Author(s):  
Maria Erna ◽  
Emriadi Emriadi ◽  
Admin Alif ◽  
Syukri Arief
Keyword(s):  
Thermodynamic Properties ◽  
Mild Steel ◽  
Corrosion Inhibition ◽  
Steel Surface ◽  
Complex Compounds ◽  
Nano Particles ◽  
Water Media ◽  
Weight Loss Method ◽  
Steel Surfaces ◽  
Loss Method

The thermodynamic properties and characterizations of corrosion inhibition of chitosan nano-particles on the surface of mild steel in peat water media had been studied using weight loss method at temperatures of 30 - 50 <sup>o</sup>C. Steel surfaces were characterized by FT-IR spectra and SEM-EDS morphology photos. The research found that the value of DG<sup>o </sup>approaching -40 kJmol<sup>-</sup><sup>1</sup>. The negative value of Gibbs free energy shows that the adsorption of inhibitor molecules on the surface of mild steel was achemisorption and it occurred spontaneously. Meanwhile, the values of DH<sup>o </sup>is also negative confirming that the adsoprtion of inhibitor molecules is an exothermic process. The value of DS<sup>o </sup>obtained is positive, it indicates hat the inhibitor molecules were adsorbed spontaneously on the mild steel surface. The analysis on mild steel surfaces hows that the nano-particle chitosan was adsorbed on the steel surface to form the complex compounds.

Numerical Prediction of Erosion of Mild Steel Surfaces by Boiler Fly Ash Particles

Volume 1 ◽  
2004 ◽  
Author(s):  
John G. Mbabazi ◽  
Thomas J. Sheer
Keyword(s):  
Fly Ash ◽  
Mild Steel ◽  
Flue Gas ◽  
Gas Flow ◽  
Erosive Wear ◽  
Test Facility ◽  
Experimental Investigations ◽  
Power Station ◽  
Erosion Rates ◽  
Steel Surfaces

Fly ash particles entrained in the flue gas from boiler furnaces in coal-fired power stations can cause serious erosive wear on steel surfaces along the downstream flow path. This paper describes research into fly ash impingement erosion on such surfaces, with particular reference to the heat transfer plates in rotary regenerative air heaters. The effect of the ash particle impact velocity and impact angle on the erosive wear of mild steel surfaces was determined through experimental investigations, using three different power station ash types. The experimental data were used to calibrate a fundamentally-derived model for the prediction of erosion rates. This erosion model was incorporated into a particle-tracking CFD flow simulation of the ash-laden flue gas flow through the complex channels between corrugated air heater plates. The predicted erosion rates were compared with measured erosion rates obtained using a large accelerated-erosion test facility located at a power station. Good agreement was obtained, the predictions generally being within 20 percent of the measured values.

An XPS study of the adsorption of organic inhibitors on mild steel surfaces

2000 ◽  
Vol 42 (7) ◽  
pp. 1197-1211 ◽  
Author(s):  
C-O.A. Olsson ◽  
P. Agarwal ◽  
M. Frey ◽  
D. Landolt
Keyword(s):  
Mild Steel ◽  
Organic Inhibitors ◽  
Steel Surfaces ◽  
Xps Study

A model to predict erosion on mild steel surfaces impacted by boiler fly ash particles

Wear ◽  
2004 ◽  
Vol 257 (5-6) ◽  
pp. 612-624 ◽  
Author(s):  
J.G Mbabazi ◽  
T.J Sheer ◽  
R Shandu
Keyword(s):  
Fly Ash ◽  
Mild Steel ◽  
Steel Surfaces ◽  
Boiler Fly Ash

The Electrodeposition of Ni-Fe-Cr Alloy Coatings on Mild Steel Surfaces and Evaluation of Corrosion Resistance

2013 ◽  
Vol 785-786 ◽  
pp. 948-952 ◽  
Author(s):  
Qi Jun Zhong ◽  
Li Bin Yu ◽  
Yi Xiao ◽  
Jian Feng Gu ◽  
Qing Dong Zhong ◽  
...  
Keyword(s):  
Mild Steel ◽  
Electrochemical Impedance ◽  
Trivalent Chromium ◽  
Equivalent Circuits ◽  
Polarisation Resistance ◽  
Heat Treated ◽  
Steel Surfaces ◽  
Eis Measurements ◽  
Scanning Electron ◽  
Electrodeposited Alloy

The electrodeposition of Ni-Fe-Cr alloys was investigated in a trivalent chromium electrolyte on the surface of mild steel over a range of current density. Scanning Electron Microscopy (SEM), Tafel plot and Electrochemical Impedance Spectroscopy (EIS) measurements were used to compare plated alloy coatings and heat-treated electrodeposited alloy coatings. The heat-treated alloy coatings showed a relatively large impedance values and corrosion inhibiting efficiency. Moreover, the polarisation resistance, Rp, was obtained by EIS modeling using equivalent circuits.

scholarly journals Corrosion Resistance of Mild Steel Coated with Orgainc Material Containing Pyrazol Moiety

Coatings ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 330 ◽  
Author(s):  
Fadoua El Hajjaji ◽  
Farid Abrigach ◽  
Othman Hamed ◽  
Abdelfatah Hasan ◽  
Mustapha Taleb ◽  
...  
Keyword(s):  
Benzoic Acid ◽  
Mild Steel ◽  
Electrochemical Impedance ◽  
Molecular Structures ◽  
Carboxyl Group ◽  
Before And After ◽  
Steel Surfaces ◽  
Surface Morphologies ◽  
Electronic Resonance ◽  
The Relationship

Pyridine (P1) and benzoic acid (P2) derivatives with pyrazole moieties were synthesized and evaluated as corrosion inhibitors for mild steel in acidic medium. The evaluation was performed by electrochemical impedance spectroscopy (EIS), potentiodynamic polarization, and weight loss measurement. The surface morphologies of the control and steel samples coated with the pyrazole derivatives P1 and P2 were examined by the scanning electron microscopy (SEM), UV-Vis, and X-ray photoelectron spectrocopy (XPS) spectroscopies. Results revealed minor changes on steel surfaces before and after immersion in a 1 M HCl solution. Both derivatives, P1 and P2, showed good inhibition efficiency that is dependent on inhibitor concentration. Both P1 and P2 act as mixed-type inhibitors. The benzoic acid derivative (P2) showed a higher efficiency than P1, which could be attributed to the carboxyl group that is located at the para position to the amino group. This induces a direct electronic resonance between the two groups, the amino and the carboxyl. As a result of this, a higher electron density on the carboxyl group and a stronger bonding to the metal surface occurred. Results also show that, the bonding of both pyrazoles on mild steel surface obey Langmuir adsorption isotherm. Quantum chemical calculations were performed to theoretically define the relationship between the molecular structures and inhibition efficiencies of P1 and P2.

Sign in / Sign up

Export Citation Format

Share Document