The Anodic Polarization Characteristics of Fe-Si-Al Alloys in 1N H2SO4

CORROSION ◽  
1984 ◽  
Vol 40 (4) ◽  
pp. 190-195 ◽  
Author(s):  
Sandra Wakefield ◽  
Franklin H. Beck ◽  
Gordon W. Powell
Keyword(s):  
Powder Metallurgy ◽  
Anodic Polarization ◽  
Aluminum Content ◽  
Al Alloys ◽  
Ingot Metallurgy ◽  
Corrosion Attack ◽  
Passive Transition ◽  
Polarization Characteristics ◽  
Passivation Potential

Abstract The anodic polarization characteristics in 1N H2SO4 (25 C) of Fe-8 Wt% Si, Fe-8Al and Fe-5Si-3Al alloys fabricated by conventional processing (ingot metallurgy) and of Fe-8Al fabricated by powder metallurgy were determined. With the exception of the Fe-8Si, the alloys undergo an active-to-passive transition. The passivation behavior is controlled by the aluminum content of the alloys, the aluminum decreasing the passivation potential. Although the appearance of the corrosion attack is different, the anodic polarization characteristics of the Fe-8Al alloy are essentially independent of the method of fabrication (i.e., ingot metallurgy vs powder metallurgy).

Fracture Toughness of Powder Metallurgy and Ingot Titanium Alloys – A Review

2013 ◽  
Vol 551 ◽  
pp. 143-160 ◽  
Author(s):  
Ajit Pal Singh ◽  
Brian Gabbitas ◽  
De Liang Zhang
Keyword(s):  
Fracture Toughness ◽  
Powder Metallurgy ◽  
Titanium Alloys ◽  
Alloy Composition ◽  
Low Cost ◽  
Ingot Metallurgy ◽  
Metal Powders ◽  
Critical Factors ◽  
Microstructural Characteristics ◽  
High Degree

Powder metallurgy (PM) is potentially capable of producing homogeneous titanium alloys at relative low cost compared to ingot metallurgy (IM). There are many established PM methods for consolidating metal powders to near net shapes with a high degree of freedom in alloy composition and resulting microstructural characteristics. The mechanical properties of titanium and its alloys processed using a powder metallurgical route have been studied in great detail; one major concern is that ductility and toughness of materials produced by a PM route are often lower than those of corresponding IM materials. The aim of this paper is to review the fracture toughness of both PM and IM titanium alloys. The effects of critical factors such as interstitial impurities, microstructural features and heat treatment on fracture toughness are also discussed

Effect of Halide Additions on Anodic Behavior of Nickel in Sulfuric Acid Solutions

CORROSION ◽  
1967 ◽  
Vol 23 (4) ◽  
pp. 109-114 ◽  
Author(s):  
JOHN POSTLETHWAITE ◽  
LEONARD B. FREESE
Keyword(s):  
Sulfuric Acid ◽  
Corrosion Potential ◽  
Negative Slope ◽  
Potential Range ◽  
Anodic Behavior ◽  
Passive Region ◽  
Hydrogen Electrode ◽  
Passive Transition ◽  
Passivation Potential ◽  
Sulfuric Acid Solutions

Abstract A potentiokinetic study, dE/dt = 950 mV/hr, has been made of the effects of sodium chloride, bromide and iodide additions, in the range 0.001 to 0.1 M, on the anodic behavior of pure nickel in deaerated N/10 sulfuric acid. Each experiment comprised a forward and reverse sweep in the potential range (relative to the standard hydrogen electrode) −0.5 to +1.2 V. Halide additions affected the anodic behavior of the nickel in both active and passive regions. All halides studied lowered the corrosion potential, raised the primary passivation potential and increased the critical passivation current density. Additions of 0.01 M and greater resulted in elimination of the normal passive region. Reactivation was much greater on reverse sweeps with chloride additions than in either plain acid or with other halides. Negative slope marking the active-passive transition on forward sweep sometimes was eliminated but was evident always on the reverse sweep showing that even when attacks in active and passive regions merge there is a change of electrode process at the normal active passive transition.

Potentiostatic Polarization of Inconel X-750

CORROSION ◽  
1972 ◽  
Vol 28 (9) ◽  
pp. 331-336 ◽  
Author(s):  
B. L. TROUT ◽  
R. D. DANIELS
Keyword(s):  
Anodic Polarization ◽  
Chloride Ion ◽  
Ion Concentration ◽  
Anodic Passivation ◽  
Solution Treated ◽  
Heat Treated ◽  
Polarization Characteristics ◽  
Potentiostatic Polarization

Abstract The anodic polarization characteristics of Inconel X-750 Alloy in two heat treated conditions, (1) solution treated and (2) solution treated and aged, were examined for sensitivity to temperature and to chloride ion concentration. The effects of microstructure and environment on the anodic passivation behavior of this alloy are correlated and discussed.

Structure investigations of ferromagnetic Co-Ni-Al alloys obtained by powder metallurgy

2010 ◽  
Vol 237 (3) ◽  
pp. 374-378 ◽  
Author(s):  
W. MAZIARZ ◽  
J. DUTKIEWICZ ◽  
L. LITYŃSKA-DOBRZYŃSKA ◽  
R. SANTAMARTA ◽  
E. CESARI
Keyword(s):  
Powder Metallurgy ◽  
Al Alloys ◽  
Structure Investigations

Gigacycle fatigue response of tool steels produced by powder metallurgy compared to ingot metallurgy tool steels

2010 ◽  
Vol 101 (9) ◽  
pp. 1140-1150 ◽  
Author(s):  
Christian Sohar ◽  
Agnieszka Betzwar-Kotas ◽  
Christian Gierl ◽  
Herbert Danninger ◽  
Brigitte Weiss
Keyword(s):  
Powder Metallurgy ◽  
Ingot Metallurgy ◽  
Tool Steels

scholarly journals Copper alloys with improved properties: standard ingot metallurgy vs. powder metallurgy

2014 ◽  
Vol 20 (3) ◽  
pp. 207-216
Author(s):  
Milan T. Jovanović ◽  
Višeslava Rajković ◽  
Ivana Cvijović-Alagić
Keyword(s):  
Electrical Conductivity ◽  
Powder Metallurgy ◽  
Mechanical Alloying ◽  
Internal Oxidation ◽  
Copper Alloys ◽  
Microstructural Characterization ◽  
Ingot Metallurgy ◽  
Vacuum Melting ◽  
X Ray ◽  
Scanning Electron

Three copper-based alloys: two composites reinforced with Al2O3 particles and processed through powder metallurgy (P/M) route, i.e. by internal oxidation (Cu-2.5Al composite) and by mechanical alloying (Cu-4.7Al2O3 ) and Cu-0.4Cr-0.08Zr alloy produced by ingot metallurgy (vacuum melting and casting) were the object of this investigation. Light microscope and scanning electron microscope (SEM) equipped with electron X-ray spectrometer (EDS) were used for microstructural characterization. Microhardness and electrical conductivity were also measured. Compared to composite materials, Cu-0.4Cr-0.08Zr alloy possesses highest electrical conductivity in the range from 20 to 800 ℃, whereas the lowest conductivity shows composite Cu-2.5Al processed by internal oxidation. In spite to somewhat lower electrical conductivity (probably due to inadequate density), Cu-2.5Al composite exhibits thermal stability enabling its application at much higher temperatures than materials processed by mechanical alloying or by vacuum melting and casting.

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