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Paper Information

Journal:   JOURNAL OF ULTRAFINE GRAINED AND NANOSTRUCTURED MATERIALS   JUNE 2017 , Volume 50 , Number 1; Page(s) 33 To 42.
 
Paper: 

CORROSION INHIBITION OF SODIUM PHOSPHATE FOR COARSE AND NEAR ULTRAFINED-GRAIN MILD STEEL SURFACE

 
 
Author(s):  SABET BOKATI KAZEM, DEHGHANIAN CHANGIZ*
 
* 1SCHOOL OF METALLURGY AND MATERIALS ENGINEERING, COLLEGE OF ENGINEERING, UNIVERSITY OF TEHRAN, TEHRAN, IRAN
 
Abstract: 

An ultrafine grain surface layer with average crystallite size of 28 nm was produced on annealed mild steel through a wire brushing process. The effects of grain size reduction on the inhibition performance of sodium phosphate were investigated using polarization and electrochemical impedance spectroscopy (EIS) measurements. The crystal grain size of wire brushed surface was analyzed by X-ray diffractometry (XRD) and field emission scanning electron microscopy (FESEM). The electrochemical tests were conducted in artificial sea water (ASW) in the presence and absence of 250 mg/lit sodium phosphate (SP). The wire brushed surface indicated considerable deformed plastic flows and high surface roughness. Due to the accumulated strains, a deformed layer with thickness of 20±5 mm was produced and the crystal grain size of severe deformed zone was about 28 nm. Wire brushed surface increased uniform corrosion rate of mild steel due to enhanced surface roughness and preferential sites to adsorption of corrosive ions. However, the wire brushed surface showed a positive effect on inhibition performance of sodium phosphate. The electrochemical results revealed that average inhibition efficiency increased from 65 to about 80 percent in ASW solution containing 1.5 mM Na3PO4 for coarse grained samples in comparison to that of ultra-fined grain samples respectively. The wire brushing process encouraged passivity on the surface in SP-containing solution due to a high density of nucleation sites which increased the adsorption of phosphate ions leading to a high fraction of passive layers and low corrosion rates.

 
Keyword(s): MILD STEEL, ULTRAFINE GRAIN SURFACE, INHIBITION PERFORMANCE, SODIUM PHOSPHATE
 
 
References: 
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Click to Cite.
APA: Copy

sabet Bokati, K., & Dehghanian, C. (2017). CORROSION INHIBITION OF SODIUM PHOSPHATE FOR COARSE AND NEAR ULTRAFINED-GRAIN MILD STEEL SURFACE. JOURNAL OF ULTRAFINE GRAINED AND NANOSTRUCTURED MATERIALS, 50(1), 33-42. https://www.sid.ir/en/journal/ViewPaper.aspx?id=570860



Vancouver: Copy

sabet Bokati Kazem, Dehghanian Changiz. CORROSION INHIBITION OF SODIUM PHOSPHATE FOR COARSE AND NEAR ULTRAFINED-GRAIN MILD STEEL SURFACE. JOURNAL OF ULTRAFINE GRAINED AND NANOSTRUCTURED MATERIALS. 2017 [cited 2021May11];50(1):33-42. Available from: https://www.sid.ir/en/journal/ViewPaper.aspx?id=570860



IEEE: Copy

sabet Bokati, K., Dehghanian, C., 2017. CORROSION INHIBITION OF SODIUM PHOSPHATE FOR COARSE AND NEAR ULTRAFINED-GRAIN MILD STEEL SURFACE. JOURNAL OF ULTRAFINE GRAINED AND NANOSTRUCTURED MATERIALS, [online] 50(1), pp.33-42. Available: https://www.sid.ir/en/journal/ViewPaper.aspx?id=570860.



 
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