IR Drop in Electrochemical Corrosion Studies— Part I: Basic Concepts and Estimates of Possible Measurement Errors

2009 ◽  
pp. 27-27-32 ◽  
Author(s):  
WC Ehrhardt
Keyword(s):  
Measurement Errors ◽  
Electrochemical Corrosion ◽  
Ir Drop ◽  
Corrosion Studies ◽  
Basic Concepts

An Automatic Polarization Apparatus for Electrochemical Corrosion Studies

CORROSION ◽  
1969 ◽  
Vol 25 (12) ◽  
pp. 515-519 ◽  
Author(s):  
W. D. HENRY ◽  
B. E. WILDE
Keyword(s):  
Cathodic Polarization ◽  
Reference Electrode ◽  
Electrochemical Corrosion ◽  
304 Stainless Steel ◽  
Constant Current ◽  
Voltage Source ◽  
Potential Range ◽  
Alloy Development ◽  
Corrosion Studies ◽  
Potentiodynamic Anodic Polarization

Abstract Statistical alloy development programs in which electrochemical screening techniques are used require facilities to produce precision polarization data. Conventional equipment and techniques presently available for such programs are not entirely satisfactory. Therefore, modifications were made to readily available commercial equipment to significantly improve the attainable sensitivity and reproducibility. This paper describes in detail the procedures necessary to produce an apparatus that automatically measures and records anodic and cathodic polarization curves over an applied potential range of ±2.0 volts. Traverse rates between 2 × 10−3 and 3 × 104 volts per hour are attainable and can be used to polarize electrodes through zero volts (with respect to reference electrode) without the necessity of manual switching. A special mode switch is described in detail with which the basic electronic potentiostat can be used as a constant current or constant voltage source by manual selection. The results obtained from three typical polarization experiments: (1) potentiodynamic anodic polarization, (2) galvanodynamic cathodic polarization, and (3) galvanodynamic linear polarization of AISI Type 304 stainless steel in hydrogen saturated 1N H2SO4 at 25 C (77 F), showed the performance of the apparatus to be equal to or superior to that of conventional manual procedures.

scholarly journals Poly(phenylene methylene)-Based Coatings for Corrosion Protection: Replacement of Additives by Use of Copolymers

2019 ◽  
Vol 9 (17) ◽  
pp. 3551 ◽  
Author(s):  
D’Elia ◽  
Magni ◽  
Trasatti ◽  
Schweizer ◽  
Niederberger ◽  
...  
Keyword(s):  
Corrosion Protection ◽  
Electrochemical Corrosion ◽  
Side Chains ◽  
Hydrophobic Coating ◽  
Corrosion Studies ◽  
Proper Design ◽  
Common Problems ◽  
Hydrocarbon Polymer ◽  
Protection Of The Metal

Poly(phenylene methylene) (PPM) is a thermally stable, hydrophobic, fluorescent hydrocarbon polymer. Recently, blended PPM has been proposed as a valuable anti-corrosion coating material, and, in particular, rheological additives such as external plasticizers resulted crucial to prevent crack formation. Accordingly, to avoid common problems related to the use of external plasticizers, the development of PPM-related copolymer-based coatings containing n-octyloxy side chains and their anti-corrosion behavior were explored in this study. The aluminum alloy AA2024, widely employed for corrosion studies, was selected as a substrate, covered with a thin layer of a polybenzylsiloxane in order to improve adhesion between the underlying hydrophilic substrate and the top hydrophobic coating. Gratifyingly, coatings with those copolymers were free of bubbles and cracks. The n-octyloxy side-chains may be regarded to adopt the role of a bound plasticizer, as the glass transition temperature of the copolymers decreases with increasing content of alkoxy side-chains. Electrochemical corrosion tests on PPM-substituted coatings exhibited good corrosion protection of the metal surface towards a naturally aerated near-neutrally 3.5% wt.% NaCl neutral solution, providing comparable results to blended PPM formulations, previously reported. Hence, the application of rheological additives can be avoided by use of proper design copolymers.

An Assembly for Electrochemical Corrosion Studies in Aqueous Environments at High Temperature and Pressure

CORROSION ◽  
1967 ◽  
Vol 23 (11) ◽  
pp. 331-334 ◽  
Author(s):  
B. E. WILDE
Keyword(s):  
Test Specimen ◽  
Reference Electrode ◽  
Electrochemical Corrosion ◽  
High Temperature And Pressure ◽  
Aisi Type ◽  
Corrosion Studies ◽  
External Reference ◽  
Aqueous Environments ◽  
Temperature And Pressure ◽  
Type 304

Abstract An assembly is described, in which electrochemical corrosion measurements can be carried out in aqueous environments up to 314 C (598 F) and 105.5 kg/cm2. Test specimen mounting and corrosive environment containment procedures are discussed. A techniqie for using a high pressure electrolyte bridge with an external reference electrode is described. The performance of the system is demonstrated by potentiostatic anodic, cathodic and linear polarization experiments carried out on AISI Type 304 steel in dilute chloride solutions at 289 C.

scholarly journals Surface Modification of Zinc with an Oxime for Corrosion Protection in Chloride Medium

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Ganesha Achary ◽  
Y. Arthoba Naik
Keyword(s):  
Electrochemical Corrosion ◽  
Corrosion Mechanism ◽  
Protective Film ◽  
Electron Transfer Rate ◽  
Organic Solution ◽  
Immersion Method ◽  
Chloride Medium ◽  
Aqueous Sodium Chloride Solution ◽  
Corrosion Studies ◽  
Different Temperatures

The surface treatment of zinc was done with different concentrations of an oxime (2E)-2-(hydroxylamino)-1,2-diphenylethanol molecule by the immersion method. The electrochemical corrosion studies of surface-treated zinc specimens were performed in aqueous sodium chloride solution (1 M, pH 5.0) at different temperatures in order to study the corrosion mechanism. The recorded electrochemical data indicated a basic modification of the cathodic corrosion behavior of the treated zinc resulting in a decrease of the electron transfer rate. The zinc samples treated by immersion in the inhibiting organic solution presented good corrosion resistance. Using scanning electron microscopy (SEM), it was found that a protective film was formed on the surface of zinc.

scholarly journals Electrochemical Studies of WC-Flyash HVOF Coating Interface on SA209-T1 Steel under 3.5 NaCl Solution

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
D. Elango ◽  
A. Daniel Das ◽  
S. P. Kumaresh Babu ◽  
S. Natarajan ◽  
A. Yeshitla
Keyword(s):  
Room Temperature ◽  
Steel Substrate ◽  
Electrochemical Corrosion ◽  
Nacl Solution ◽  
Hvof Coating ◽  
Corrosion Studies ◽  
Boiler Tubes ◽  
Boiler Material ◽  
Corrosive Environments ◽  
Oxygen Fuel

In this present research, the coatings of SA209-T1 using high velocity oxygen fuel were employed for the application of boiler tubes. Due to the adaptation of corrosion easy in boiler material, the research of those properties is significant because of its criticality and functionality during the service time. A right coating was found and applied on the SA209-T1 surface against corrosive environments. Good corrosion resistance is achieved by WC-flyash coatings applied on SA209-T1 substrate. The 90% WC-10% flyash coatings were found to be more protective followed by SA209-T1 steel. WC-flyash covering was tracked down so that the covering is compelling to secure the SA209-T1 steel substrate. It is reasoned that the arrangement of NiO, Cr2O3, CoO, and NiCr2O4 could add to the advancement of consumption opposition in coatings. The steel of uncoated endured erosion as extraordinary stripping and spalling of the scale, which could be because of the development of Fe2O3 oxide scale unprotectively. This paper reveals the performance, applications, and development of 90wt.% WC and 10wt.% fly ash through HVOF coating in SA209-T1 for electrochemical corrosion studies at room temperature.

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