Physical and local electrochemical techniques for measuring corrosion rates of metals

2014 ◽  
pp. 169-196 ◽  
Author(s):  
B. Tribollet ◽  
V. Vivier
Keyword(s):  
Electrochemical Techniques ◽  
Corrosion Rates

scholarly journals Corrosion Behavior of Al in Ethanol–Gasoline Blends

Energies ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 5544
Author(s):  
Alfredo Brito-Franco ◽  
Jorge Uruchurtu ◽  
Isai Rosales-Cadena ◽  
Roy Lopez-Sesenes ◽  
Sergio Alonso Serna-Barquera ◽  
...  
Keyword(s):  
Corrosion Behavior ◽  
Sugar Cane ◽  
Electrochemical Noise ◽  
Electrochemical Impedance ◽  
Pure Aluminum ◽  
Electrochemical Techniques ◽  
Intermediate Compound ◽  
Corrosion Process ◽  
Corrosion Rates ◽  
Adsorption Desorption

The corrosion behavior of pure aluminum (Al) in 20 v/v% ethanol–gasoline blends has been studied using electrochemical techniques. Ethanol was obtained from different fruits including sugar cane, oranges, apples, or mangos, whereas other techniques included lineal polarization resistance, electrochemical noise, and electrochemical impedance spectroscopy for 90 days. Results have shown that corrosion rates for Al in all the blends were higher than that obtained in gasoline. In addition, the highest corrosion rate was obtained in the blend containing ethanol obtained from sugar cane. The corrosion process was under charge transfer control in all blends; however, for some exposure times, it was under the adsorption/desorption control of an intermediate compound. Al was susceptible to a localized, plotting type of corrosion in all blends, but they were bigger in size and in number in the blend containing ethanol obtained from sugar cane.

Prediction and Measurement of Corrosion Rates of Stainless Steel in Concentrated Sulfuric Acid

CORROSION ◽  
10.5006/0709 ◽  
2013 ◽  
Vol 69 (6) ◽  
pp. 543-550 ◽  
Author(s):  
S. Jones ◽  
K. Coley ◽  
J. Kish
Keyword(s):  
Stainless Steel ◽  
Sulfuric Acid ◽  
Corrosion Behavior ◽  
Electrochemical Behavior ◽  
Open Circuit Potential ◽  
Electrochemical Techniques ◽  
Open Circuit ◽  
Corrosion Rates ◽  
Transient Nature ◽  
Concentrated Sulfuric Acid

When exposed to concentrated sulfuric acid, stainless steel exhibits unique electrochemical behavior. This behavior can be observed as an oscillation in open-circuit potential between the active and passive states. The transient nature of the corrosion behavior under these conditions results in a distinct challenge for measuring and predicting corrosion rates. Using a series of commercial alloys with various nickel contents, this paper outlines the utilization of electrochemical experimentation to refine the prediction of corrosion rates. The paper also discusses some of the difficulties associated with many traditional electrochemical techniques such as potentiodynamic scans when used for characterizing systems that undergo oscillations in open-circuit potential.

Electrochemical Measurement of Low Corrosion Rates

CORROSION ◽  
1966 ◽  
Vol 22 (7) ◽  
pp. 198-205 ◽  
Author(s):  
D. A. JONES ◽  
N. D. GREENE
Keyword(s):  
Linear Polarization ◽  
Electrochemical Techniques ◽  
Electrochemical Measurement ◽  
Corrosion Rates

Abstract Materials with corrosion rates of 0.i mpy or less are required in many applications. In this investigation, application of linear polarization to measurement of low corrosion rates is examined, Also, two new electrochemical techniques are derived theoretically and verified experimentally. These methods can measure accurately corrosion rates less than 0.0005 mpy and require 20 minutes or less to perform.

Reliability of Electrochemical Techniques for Determining Corrosion Rates on Carbon Steel in Sulfide Media

CORROSION ◽  
2007 ◽  
Vol 63 (4) ◽  
pp. 346-358 ◽  
Author(s):  
L. R. Hilbert ◽  
T. Hemmingsen ◽  
L. V. Nielsen ◽  
S. Richter
Keyword(s):  
Carbon Steel ◽  
Electrochemical Techniques ◽  
Corrosion Rates

scholarly journals Effect of Experimental Aging on the Performance of Al-7.9Mg-13.3Zn and Al-10.5Mg-8.6Zn Alloys as Sacrificial Anodes

Metals ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 863 ◽  
Author(s):  
Hernández ◽  
Torres ◽  
Serna ◽  
Mayén ◽  
Campillo
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Electrochemical Techniques ◽  
Metallographic Analysis ◽  
Low Density ◽  
Sacrificial Anodes ◽  
Corrosion Rates ◽  
Heat Treated ◽  
Corrosion Mechanisms ◽  
Zn Alloys

Light aluminum alloys have a great importance in industry owing to generally accessible costs, low density, good machinability, and corrosion resistance under certain environments. The present work studies aging treatments that preform important roles on the distribution and microstructural changes of two AlMg-Zn alloys, and the resulting effect on the corrosion behavior. The experimental AlMg-Zn alloys were cast and then heat treated at 200 °C, after the solubilization treatments were made, using different treatment times. These alloys showed important changes in their corrosion mechanisms, but mainly, corrosion started at AlxMgyZnz complex phases in both alloys. The optimal corrosion rates were reached after 5 and 24 hours of heat treatment. These results were obtained through electrochemical techniques in NaCl solutions, and by metallographic analysis using SEM and optical microscopy.

scholarly journals Galvanic Corrosion Between Ti/Ti6Al4V and Various Dental Alloys

2017 ◽  
Vol 6 (3) ◽  
pp. 221 ◽  
Author(s):  
Daniel Mareci ◽  
Catalin Bocanu ◽  
Neculai Aelenei ◽  
Gheorghe Nemtoi
Keyword(s):  
Corrosion Potential ◽  
Galvanic Corrosion ◽  
Surrounding Medium ◽  
Electrochemical Techniques ◽  
Corrosion Process ◽  
Dental Alloys ◽  
Corrosion Rates ◽  
Current Densities ◽  
Titanium Alloy Ti6al4v ◽  
Electrochemical Potentials

<p>The corrosion tendencies of metals are related with their position in the electromotive series. These electrode potential degrees may change due to the composition of the alloys, the surrounding medium or due to the alterations in the composition because of the recurrent costing. The galvanic corrosion appears when different electrochemical potentials are bound to one another and the electrical conductibility is assured by the presence of an electrolyte. It is difficult to avoid coupling of different metals, a problem concerning the choice of the alloy used for the implant bone supra-structure. One has studied the galvanism of several couples formed between a dental implant and diverse dental alloys in Afnor saliva. The electrochemical behavior of 8 commercial dental alloy superstructures with titanium and titanium alloy (Ti6Al4V) implants was investigated by electrochemical techniques. Non-precious alloys were Ni-Cr based (Wiron NT and Verasoft), Co-Cr based (Vitallium alloy) and Cu based (Gaudent). Semi-precious alloys were Ag-Pd based (RX91 and Unique White). The precious alloys were Au-Pd based (Ceram) and Au-Ag based (Argenco). Some of the corroded and non-corroded surfaces were observed by optical microscopy. From linear polarization curves the corrosion potential and the current densities were evaluated. The results showed very low corrosion rates, ranking from 10<sup>-6</sup> to 10<sup>-9</sup> A/cm<sup>2</sup>. All the results obtained indicate the fact that the corrosion process intensity corresponding to the coupling between titanium (respectively Ti6Al4V) and semi-precious alloys is reduced. The surface of precious and semi-precious alloys is not attacked, but the titanium (Ti6Al4V) surface is oxidized in time.</p>

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