Anodic Polarization Studies in Neutral and Alkaline Solutions Containing Corrosion Inhibitors

1962 ◽  
Vol 109 (2) ◽  
pp. 81 ◽  
Author(s):  
K. S. Rajagopalan ◽  
K. Venu ◽  
K. Balakrishnan
Keyword(s):  
Anodic Polarization ◽  
Corrosion Inhibitors ◽  
Alkaline Solutions ◽  
Polarization Studies

Inhibition of Corrosion of Commercial Aluminum In Alkaline Solutions

CORROSION ◽  
1961 ◽  
Vol 17 (1) ◽  
pp. 39t-44t ◽  
Author(s):  
J. SUNDARARAJAN ◽  
T. L. RAMA CHAR
Keyword(s):  
Sodium Hydroxide ◽  
Metal Surface ◽  
Anodic Polarization ◽  
Corrosion Process ◽  
Alkaline Solutions ◽  
Corrosion Rates ◽  
Mixed Control ◽  
Polarization Studies ◽  
Percent Manganese

Abstract The corrosion rates for commercial aluminum, containing 4 percent manganese and 3 percent iron, have been determined in sodium hydroxide solutions under different conditions. The inhibitor efficiencies have been calculated for the following substances, the efficiency decreasing from 90 to 60 percent in the order: agar-agar, gum-acaciae, dextrin, gelatin, glue. Corrosion potentials have been measured with and without dextrin inhibitor, and cathodic and anodic polarization studies made. The results show that the dissolution of the metal is electrochemical in character. The corrosion process appears to be under mixed control with predominance of action of dextrin inhibitor on the anodic areas of the metal surface. 6.4.2, 4.3.3, 5.8.2

Plasma Electrolytic Oxidation (PEO) Coatings on Aluminum Alloys: Kinetics and Formation Mechanism

2019 ◽  
Author(s):  
Alex Lugovskoy ◽  
Lyubov Snizhko
Keyword(s):  
Aluminum Alloys ◽  
Plasma Electrolytic Oxidation ◽  
Anodic Polarization ◽  
Point Of View ◽  
Alkaline Solutions ◽  
Inorganic Polymers ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic ◽  
Peo Coatings ◽  
First Time

In this review, the main kinetics and mechanism regularities of plasma electrolytic oxidation (PEO) of aluminum alloys are discussed. The material and heat balances of the PEO process, including anomalous gas evolution and possible thermochemical reactions are presented for the first time. Side effects accompanying spark discharges from both the surface and the electrolyte sides are analyzed. The influences of electrical regime (direct, alternative, and pulse current) on the rate of coatings growth are summarized from the electrochemical point of view. Different modes of anodic polarization and electrolyte composition (alkaline solutions with inorganic polymers and dispersed constituents) are discussed in the applicative aspect.

Polarization Studies of Aluminum Alloys In Water at 200 C and 300 C

CORROSION ◽  
1963 ◽  
Vol 19 (4) ◽  
pp. 146t-155t ◽  
Author(s):  
J. H. GREENBLATT ◽  
A. F. McMILLAN
Keyword(s):  
Anodic Polarization ◽  
Cathodic Polarization ◽  
Oxidation Potential ◽  
Electronic Conduction ◽  
Film Resistance ◽  
Applied Current ◽  
Weight Gain Data ◽  
Current Densities ◽  
Polarization Studies ◽  
Impressed Current

Abstract Specimens of commercial 2S aluminum and two special alloys containing iron and nickel were polarized anodically and cathodically at a number of different current densities at 200 C and 300 C. Weight gains were obtained and the potentials relative to the stainless steel autoclave were measured by an interrupter method. The weight gain data indicated that the polarizing current is being carried by electronic conduction. The potential-time curves for anodic polarization indicate differences between 2S aluminum and the alloys in that greater polarization is obtained with the latter. These curves also indicate that the impressed current decreases the film resistance. In all cases the potential reached a plateau value with time and this time was shorter for the alloys. The potential-time curves for cathodic polarization also show plateau values but the rise to a plateau value is in the opposite sense to the applied current. With increasing cathodic polarization the plateau values occur at more negative values of the potential. This latter trend is in the same direction as the applied polarizing current. This apparently is explained in terms of the build-up of the aluminum oxidation potential which acts in a sense opposite to the applied current. Again the time to reach plateau values was shorter for the alloys. Voltage current curves were also obtained on specimens left overnight (approximately 17 hours) at two different anodic polarizing currents. These curves indicated differences between 2S aluminum and the alloys; these differences are discussed in terms of the semi-conducting properties of the oxide film. The observations made on the differences in the properties of the oxide films on the materials examined as revealed by potential and polarization curves are discussed as to their significance in determining corrosion resistance.

Electrochemical Studies of some New Mannich Bases Compounds as Corrosion Inhibitors for Mild Steel in Acidic Media

2012 ◽  
Vol 538-541 ◽  
pp. 2329-2333 ◽  
Author(s):  
Hui Xia Feng ◽  
Jian Li ◽  
Xiao Hong Gao
Keyword(s):  
Mild Steel ◽  
Corrosion Inhibition ◽  
Corrosion Inhibitors ◽  
Steel Corrosion ◽  
Mannich Bases ◽  
Maximum Efficiency ◽  
Tafel Polarization ◽  
Mild Steel Corrosion ◽  
Polarization Studies ◽  
Inhibition Property

The corrosion inhibition behaviour of four selected Mannich bases compounds,namely 3-((N-methyl,N-phenyl)-methyl)2,4-Acetylacetone(MPMAA),3-((N-phenyl)-methyl) 2,4-Acetylacetone (PMAA),3-((N, N-diethyl)-methyl) 2, 4-Acetylacetone(DMAA) and 3-((N, N-methyl)-methyl) 2, 4-Acetylacetone (MMAA) as corrosion inhibitors for mild steel in 1M HCl solutions. Tafel polarization methods were performed to determine the corrosion parameters and inhibition efficiencies. Experimental results showed that PMAA is an excellent inhibitor for mild steel corrosion in 1M HCl solutions; showing a maximum efficiency 92.3% at concentration of 40mg/L. Polarization studies showed that the Mannich bases compounds can be regarded as mixed-type inhibitors and the inhibition efficiency of the four inhibitors followed the order PMAA > MPMAA > DMAA > MMAA. Then scanning electron microscope (SEM)techniques were also employed to examine the mechanism of corrosion inhibition property.

Anodic polarization studies of some ion-implanted metal surfaces

1983 ◽  
Vol 209-210 ◽  
pp. 867-871 ◽  
Author(s):  
Chen Qing-Ming ◽  
Chen He-Ming ◽  
Bai Xin-De ◽  
Zhang Ji-Zhong ◽  
Wang Hong-Hong ◽  
...  
Keyword(s):  
Metal Surfaces ◽  
Anodic Polarization ◽  
Polarization Studies ◽  
Ion Implanted

scholarly journals The Inhibition of Mild Steel Corrosion in Sulfuric Acid by New Dapsone Derivatives

2014 ◽  
Vol 10 (3) ◽  
pp. 2388-2402 ◽  
Author(s):  
M.P. Chakravarthy ◽  
Dr. K. N. Mohana ◽  
C.B. Pradeep Kumar
Keyword(s):  
Mild Steel ◽  
Corrosion Inhibitors ◽  
Electrochemical Impedance ◽  
Steel Corrosion ◽  
Tafel Polarization ◽  
New Class ◽  
Mild Steel Corrosion ◽  
Langmuir Isotherm Model ◽  
Polarization Studies ◽  
Corrosion Inhibition Efficiency

Dapsone derivatives Viz., 4, 4’-sulfonylbis(N-((1H-pyrrol-2-yl)methylene)aniline) (SBPMA) and 2-dimethylamino-5-[(4-{4-[(4-dimethylamino-benzylidene)-amino]-benzenesulfonyl}-phenylimino)-methyl]-benzene (DBBPB), a new class of corrosion inhibitors have been synthesized and their corrosion inhibition efficiency on mild steel in 0.5 M H2SO4 was investigated by mass loss,  Tafel polarization and AC impedance measurements. Potentiodynamic polarization studies showed that, these compounds behave as mixed type of corrosion inhibitors. The adsorption process was found to obey Langmuir isotherm model. Electrochemical impedance spectroscopy (EIS) studies revealed that polarization resistance (RP) increases and double layer capacitance (Cdl) decreases as the concentration of the inhibitors increases. Various thermodynamic parameters for the adsorption of inhibitors on mild steel were computed and discussed. FTIR, EDX and SEM analyses were performed to study the film persistency of the inhibitors.

Efficiency of Vapor Phase Corrosion Inhibitors for Ferrous Metals in Neutral and Alkaline Solutions

CORROSION ◽  
2011 ◽  
Vol 67 (4) ◽  
pp. 045001-1-045001-7 ◽  
Author(s):  
U. Rammelt ◽  
S. Koehler ◽  
G. Reinhard
Keyword(s):  
Vapor Phase ◽  
Corrosion Inhibitors ◽  
Alkaline Solutions ◽  
Ferrous Metals
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