In this work, the inhibition behaviour of rare earth (RE) salts (Y(NO 3 ) 3 .6H 2 O, CeCl 3 .7H 2 O) in conjunction with metasilicates (Na 2 SiO 3 .5H 2 O) for carbon steel A37 and in aerated 3%NaCl solutions has been investigated. Corrosion inhibition power evaluation and surface layer characterisation have been carried out by electrochemical measurements (potentiodynamic polarisation and impedance) followed by X-ray photoelectron spectroscopy. It was demonstrated that the binary RE/SiO 22 3 improved the protective role of oxide/hydroxide films formed on the steel. Electrochemical tests showed that the cathodic and anodic reactions were both inhibited to some extent, leading to a decreased rate of the global corrosion process. The maximum protective inhibition against corrosion attack was evident when an RE/SiO 22 3 ion mixture was added. Surface analysis revealed the diverse nature of inhibitor coverage on the steel.
The work presented in this paper deals with the determination of optimum parameters during the partial acidulation of the phosphate ore of Djebel Onk (Algeria) and the determination of P 2 O 5 water-soluble. The first part is devoted to P 2 O 5 conversion rate during partial acidulation of phosphate with different particle sizes (80 μm, 160 μm and 250 μm). These conversion rates are obtained by performing a series of reactions between phosphate and sulfuric acid diluted from 10 to 50 wt% and with reaction times ranging from 10 to 50 minutes. The best conversion rate (38.78%) was obtained at a reaction time of 50 minutes with phosphate particle size of 80 μm and an acid concentration of 50 wt%. The second part, concerns the measurement of P 2 O 5 water-soluble of phosphate partially acidulated (PAPRs) with 40% and 50 wt% sulfuric acid. The percentage of P 2 O 5 soluble in water has reached 14.98% for PAPRs obtained with phosphate particle size of 80 μm and an acid of 50 wt%.
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