Electrochemical corrosion studies of ultrafine-grained aluminium alloy EN AW-6063

2013 ◽  
Vol 66 (3) ◽  
pp. 226-232 ◽  
Author(s):  
L. Krüger ◽  
F. Schwarz ◽  
M. Mandel ◽  
M. Hockauf
Keyword(s):  
Aluminium Alloy ◽  
Electrochemical Corrosion ◽  
Corrosion Studies ◽  
Ultrafine Grained

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.

XPS and corrosion studies on zinc phosphate coated 7075-T6 aluminium alloy

1994 ◽  
Vol 29 (5) ◽  
pp. 1368-1373 ◽  
Author(s):  
W. F. Heung ◽  
Y. P. Yang ◽  
P. C. Wong ◽  
K. A. R. Mitchell ◽  
T. Foster
Keyword(s):  
Aluminium Alloy ◽  
Zinc Phosphate ◽  
Corrosion Studies

X-ray photoelectron spectroscopy and corrosion studies of zinc phosphate coated on 7075-T6 aluminium alloy

1994 ◽  
Vol 29 (14) ◽  
pp. 3653-3657 ◽  
Author(s):  
W. F. Heung ◽  
Y. P. Yang ◽  
M. Y. Zhou ◽  
P. C. Wong ◽  
K. A. R. Mitchell ◽  
...  
Keyword(s):  
Aluminium Alloy ◽  
Photoelectron Spectroscopy ◽  
Zinc Phosphate ◽  
X Ray ◽  
Corrosion Studies

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.

Effects of Passes on Equal Channel Angular Pressing of 6061 Aluminium Alloy

2013 ◽  
Vol 747 ◽  
pp. 615-618
Author(s):  
Chaiyasit Banjongprasert ◽  
Chonlada Domrong ◽  
Torranin Chairuangsri
Keyword(s):  
Aluminium Alloy ◽  
Equal Channel Angular Pressing ◽  
Electron Back Scatter Diffraction ◽  
X Ray ◽  
Angular Pressing ◽  
Ultrafine Grained ◽  
High Fraction ◽  
6061 Aluminium Alloy ◽  
High Level ◽  
Scanning Electron

Equal channel angular pressing (ECAP) is one of severe plastic deformation (SPD) techniques that gives a high level of strain and eventually results in ultrafine-grained structure. This research aims to study the effects of passes on equal channel angular pressing of 6061 aluminium alloy. The samples were subjected to ECAP using route Bc with 1, 2, 3, and 4 passes. The processed samples were characterized using a variety of techniques: Optical Microscopy (OM); Scanning Electron Microscopy (SEM) equipped with Energy Dispersive X-ray (EDX); and Electron Back Scatter Diffraction (EBSD). The results showed that ECAP had a large influence on misorientation and size of grains but little effects on precipitates. The 4-pass ECAP led to a high fraction of low-angle boundaries and led to a nearly 97% increase of hardness.

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.

Study On the Corrosion Resistance Properties of the Ceramic Coating Obtained Through Microarc Oxidation on the Aluminium Alloy Surface

2007 ◽  
Vol 353-358 ◽  
pp. 1733-1736 ◽  
Author(s):  
Fei Chen ◽  
Hai Zhou ◽  
Chen Chen ◽  
Fan Xiu Lu ◽  
Fan Xiu Lu
Keyword(s):  
Corrosion Resistance ◽  
Aluminium Alloy ◽  
Ceramic Coating ◽  
Microarc Oxidation ◽  
Electrochemical Corrosion ◽  
Nacl Solution ◽  
X Ray Diffraction ◽  
Micro Arc Oxidation ◽  
Coating Formation ◽  
Α Al2o3

Oxidation ceramic coating was directly synthesized on LY12 aluminium alloy by micro-arc oxidation (MAO) process in Na2SiO3 electrolyte solution with the Na2WO4-KOH-Na2EDTA addition. The corrosion resistance of the coating was tested using CS300P electrochemical corrosion workshop in 3.5% NaCl solution. Using the scanning electron microscopy (SEM) and X-ray diffraction (XRD), the cross-section microstructure, the surface morphology and the phase structure of the micro-arc oxidation ceramic coating were analyzed. The results showed that the corrosion resistance of the micro-arc oxidation ceramic coating in 3.5% NaCl solution was enhanced remarkably, the corrosion velocity was obviously slowed down. The thickness of micro-arc oxidation ceramic coating was about 11μm. The final phases in the coating were found to be α-Al2O3 and γ-Al2O3. The mechanism of the oxidation ceramic coating formation was investigated too.

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.

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