Effect of sulphide ions on corrosion behaviour of iron in alkaline solutions

2008 ◽  
Vol 43 (3) ◽  
pp. 225-230 ◽  
Author(s):  
S.M. Abd Haleem ◽  
E.E. Abd El Aal
Keyword(s):  
Corrosion Behaviour ◽  
Alkaline Solutions ◽  
Sulphide Ions

scholarly journals Corrosion Behaviour of a New Low-Nickel Stainless Steel Reinforcement: A Study in Simulated Pore Solutions and in Fly Ash Mortars

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
M. Criado ◽  
S. Fajardo ◽  
J. M. Bastidas
Keyword(s):  
Stainless Steel ◽  
Fly Ash ◽  
Lower Cost ◽  
Electrochemical Impedance ◽  
Corrosion Behaviour ◽  
Nickel Content ◽  
Alkaline Solutions ◽  
Humidity Measurements ◽  
Evolution With Time ◽  
Alkali Activated

The present paper studies the corrosion behaviour of a new lower-cost type of austenitic stainless steel (SS) with a low nickel content in alkaline-saturated calcium hydroxide solution (a simulated concrete pore (SCP) solution) with sodium chloride (0.0%, 0.4%, 1.0%, 2.0%, 3.0%, and 5.0% NaCl) and embedded in alkali-activated fly ash (AAFA) mortars manufactured using two alkaline solutions, with and without chloride additions (2% and 5%), in an environment of constant 95% relative humidity. Measurements were performed at early age curing up to 180 days of experimentation. The evolution with time of electrochemical impedance spectroscopy was studied.Rctvalues obtained in SCP solution or in fly ash mortars were so high that low-nickel SS preserved its passivity, exhibiting high corrosion resistance

Colloidal sulphur production by electrochemical oxidation of sulphide in a swirling flow reactor

2021 ◽  
Author(s):  
Camila C. Contigiani ◽  
Juan P. Fornés ◽  
Omar González Pérez ◽  
J. M. Bisang
Keyword(s):  
Electrochemical Oxidation ◽  
Flow Reactor ◽  
Swirling Flow ◽  
Alkaline Solutions ◽  
Sulphide Ions ◽  
Cylindrical Reactor ◽  
Colloidal Sulphur

A cylindrical reactor with swirling flow is tested for the production of colloidal sulphur via the oxidation of sulphide ions with a concentration of 2 g dm−3 in alkaline solutions...

The effect of stress on the corrosion behaviour of mild steel in alkaline solutions

1979 ◽  
Vol 19 (4) ◽  
pp. 215-224 ◽  
Author(s):  
V.K. Gouda ◽  
A.A. Abdul Azim ◽  
H.A. El-Sayed
Keyword(s):  
Mild Steel ◽  
Corrosion Behaviour ◽  
Alkaline Solutions

Corrosion behaviour and chemical stability of transparent hybrid sol-gel coatings deposited on aluminium in acidic and alkaline solutions

2018 ◽  
Vol 124 ◽  
pp. 286-295 ◽  
Author(s):  
Peter Rodič ◽  
Ingrid Milošev ◽  
Maria Lekka ◽  
Francesco Andreatta ◽  
Lorenzo Fedrizzi
Keyword(s):  
Chemical Stability ◽  
Corrosion Behaviour ◽  
Sol Gel ◽  
Alkaline Solutions

The Corrosion Behaviour of a Hypereutectic Al-Si Alloy Obtained by Spray Forming in Acid, Neutral and Alkaline Solutions

2006 ◽  
Vol 530-531 ◽  
pp. 126-131 ◽  
Author(s):  
H.O. Santos ◽  
Clarice Terui Kunioshi ◽  
J.L. Rossi ◽  
Isolda Costa
Keyword(s):  
Electrochemical Impedance ◽  
Corrosion Behaviour ◽  
Technological Development ◽  
High Strength ◽  
Spray Forming ◽  
Alkaline Solutions ◽  
Neutral Medium ◽  
Corrosion Performance ◽  
Acid Electrolyte ◽  
Cylinder Liners

Al-Si hypereutectic alloys produced by spray forming represent an important technological development for application in the aeronautical and automotive industries. Due to some special properties these alloys find application as cylinder liners, mainly due to their high strength and wear resistance. Much research has been carried out to evaluate the mechanical properties of these alloys but the literature on their corrosion performance is still very scarce. In this study, the corrosion behaviour of a spray formed Al-Si-Cu hypereutectic alloy was investigated by electrochemical impedance spectroscopy (EIS) in acid (pH 3.3), neutral (pH 7) and alkaline (pH 11) solutions. Intense localized attack occurred in the acid electrolyte and the impedance decreased with time of immersion. In the neutral medium, the alloy was passivated but localized attack also occurred on weak areas of the passive film. In the alkaline medium, precipitation of corrosion products occurred during the first hours of immersion causing the increase of impedance but thickening of this layer led to cracks growth with time and, consequently, to the exposure of metallic substrate, resulting in the decrease in impedance for longer periods.

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