Search
Filters
Close

Save 20% on select titles with code HIDDEN24 - Shop The Sale Now

Study on Effect of Phosphate Species on Green Rust Transformation in Steel in Marine Environment

Product Number: 51300-11403-SG
Author: Gadadhar Sahoo, Shun Fujieda, Kozo Shinoda and Shigeru Suzuki
Publication Date: 2011
$0.00
$20.00
$20.00
Green Rust I (Cl-) (GRI(Cl-)) was prepared from ferrous and ferric chloride solution. The effect of phosphate on GRI(Cl-) and final products was studied by adding Na2HPO4 to GRI(Cl-) suspensions prior to oxidation according to Fe/P molar ratio of 10.5, 55 and 137, and water blank without containing any phosphate. Analysis of supernatant solution of intermediate and final product by inductively couple plasma spectrometer (ICP) showed complete adsorption and retention of phosphate in GRI(Cl-) and final product respectively. The X-ray diffraction (XRD) patterns of intermediate and final products revealed that phosphate stabilizes GRI(Cl-) and the effect is more pronounced for highest phosphate concentration (Fe/P of 10.5). The substantial broad XRD peaks of lepidocrocite in the case of Fe/P molar ratio of 10.5 indicated the effect of phosphate in reducing crystallite size. The dramatically reduction in particle size was noticed from the TEM observation with the addition of phosphate species. The presence of phosphate species in rust may be beneficial in terms of improved corrosion resistance for stabilization of GRI(Cl-) and smaller particle size of final products.

Key words: Green Rust I(Cl-), Phosphate, Lepidocrocite, Steel, Corrosion, Marine environment
Green Rust I (Cl-) (GRI(Cl-)) was prepared from ferrous and ferric chloride solution. The effect of phosphate on GRI(Cl-) and final products was studied by adding Na2HPO4 to GRI(Cl-) suspensions prior to oxidation according to Fe/P molar ratio of 10.5, 55 and 137, and water blank without containing any phosphate. Analysis of supernatant solution of intermediate and final product by inductively couple plasma spectrometer (ICP) showed complete adsorption and retention of phosphate in GRI(Cl-) and final product respectively. The X-ray diffraction (XRD) patterns of intermediate and final products revealed that phosphate stabilizes GRI(Cl-) and the effect is more pronounced for highest phosphate concentration (Fe/P of 10.5). The substantial broad XRD peaks of lepidocrocite in the case of Fe/P molar ratio of 10.5 indicated the effect of phosphate in reducing crystallite size. The dramatically reduction in particle size was noticed from the TEM observation with the addition of phosphate species. The presence of phosphate species in rust may be beneficial in terms of improved corrosion resistance for stabilization of GRI(Cl-) and smaller particle size of final products.

Key words: Green Rust I(Cl-), Phosphate, Lepidocrocite, Steel, Corrosion, Marine environment
Product tags
Also Purchased
Picture for 98357 Recent Progress in the Study of Protective
Available for download

98357 Recent Progress in the Study of Protective Rust-Layer Formation on Weathering Steel

Product Number: 51300-98357-SG
ISBN: 98357 1998 CP
Author: M.Yamashita, T.Misawa
$20.00
Picture for 11132 Optimization of the Coating Anomaly Detection and Prioritization Methodology
Available for download

Optimization of the Coating Anomaly Detection and Prioritization Methodology Using Voltage Gradient Surveys

Product Number: 51300-11132-SG
ISBN: 2011 11132 CP
Author: Chijioke Ukiwe and Shamus McDonnell
Publication Date: 2011
$20.00