The Active-to-passive Transition of Chalcopyrite

2019 ◽  
Vol 2 (3) ◽  
pp. 165-175 ◽  
Author(s):  
Gonzalo Viramontes-Gamboa ◽  
Berny Fernando Rivera-Vasquez ◽  
David G. Dixon
Keyword(s):  
Passive Transition

Initial Computational Investigation Toward Passive Transition Delay Using a Phononic Subsurface

2021 ◽  
Author(s):  
Caleb J. Barnes ◽  
Carson L. Willey ◽  
Kevin Rosenberg ◽  
Albert Medina ◽  
Abigail T. Juhl
Keyword(s):  
Computational Investigation ◽  
Passive Transition ◽  
Transition Delay

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.

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).

Role of nickel and chrome in the active-passive transition in low-strength steels in media with high pH values

1989 ◽  
Vol 25 (1) ◽  
pp. 35-39
Author(s):  
A. V. Vasilik ◽  
S. I. Girnyi ◽  
R. K. Melekhov
Keyword(s):  
High Ph ◽  
Ph Values ◽  
Passive Transition ◽  
Low Strength
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