ELECTROCHEMICAL BEHAVIOR OF ELECTRODEPOSITED NANOCRYSTALLINE COBALT-IRON ALLOY COATING IN DIFFERENT PH

2015 ◽  
Vol 76 (10) ◽  
Author(s):  
Nik Rozlin Nik Mohd Masdek ◽  
Akram Alfantazi
Keyword(s):  
Dissolution Rate ◽  
Electrochemical Behavior ◽  
Iron Alloy ◽  
Alloy Coating ◽  
Sodium Sulphate ◽  
Basic Medium ◽  
Anodic Reaction ◽  
Cobalt Iron ◽  
Sulphide Ions ◽  
Basic Solutions

The electrochemical behavior of a cobalt-iron (CoFe) alloy electrode in 0.1 M Na2SO4 (sodium sulphate) aqueous solution of different pH was investigated. The presence of a different concentration of dissolved sulphide ions with different pH on the corrosion of electrodeposited cobalt-iron was investigated using the EQCM technique. The corrosion rates of the alloys in acidic solutions are pronouncedly high, compared to those measured in neutral or basic solutions. The presence of sulphide ions accelerates markedly the anodic reaction for all deposits in the basic medium. The dissolution rate was twice two times faster when S2− was added. By employing the EQCM, it was observed that the mass decrease or dissolution rate was significant with an increase in pH concentration. 

AMPCOLOY 570

Alloy Digest ◽  
1980 ◽  
Vol 29 (3) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Cast Iron ◽  
Iron Alloy ◽  
Heat Treating ◽  
Nickel Aluminum ◽  
High Quality ◽  
Glass Making ◽  
Temperature Performance ◽  
Wide Range ◽  
Cobalt Iron

Abstract AMPCOLOY 570 is a cast copper-nickel-aluminum-cobalt-iron alloy specially developed for applications involving severe stresses and high temperatures, such as glass-making molds and plate-glass rolls. It is significantly superior to cast iron which has been commonly used for glass-making molds. Good foundry techniques will yield high-quality castings of Ampcoloy 570 in a wide range of section sizes. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on high temperature performance and corrosion resistance as well as casting, heat treating, machining, and joining. Filing Code: Cu-392. Producer or source: Ampco Metal Inc..

INCONEL ALLOY 783

Alloy Digest ◽  
2004 ◽  
Vol 53 (2) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Iron Alloy ◽  
Heat Treating ◽  
Inconel Alloy ◽  
Nickel Cobalt ◽  
Three Phase ◽  
Cobalt Iron ◽  
Aging Alloy ◽  
Oxidation Resistant ◽  
Clearance Control

Abstract Inconel Alloy 783 is an oxidation resistant, low expansion, nickel-cobalt-iron alloy with other additions. The alloy is a three-phase aging alloy that is of interest for close clearance control components in the aerospace arena. This datasheet provides information on composition, physical properties, elasticity, tensile properties, and shear strength. It also includes information on corrosion resistance as well as forming, heat treating, and machining. Filing Code: CO-95. Producer or source: Special Metals Corporation. Originally published January 1995, revised February 2004.

Comparison of Electrochemical Behavior of Cu-10Ni-10Zn Alloy and Cu in Aqueous Solutions

2015 ◽  
Vol 229 (3) ◽  
Author(s):  
Waheed A. Badawy ◽  
Mohamed M. El-Rabiei ◽  
Hashem M. Nady ◽  
Mohammed A. Samy
Keyword(s):  
Electrochemical Behavior ◽  
Electrochemical Impedance ◽  
Electrochemical Techniques ◽  
Pure Copper ◽  
Open Circuit ◽  
Chloride Ions ◽  
Alloy Surface ◽  
Metallic Surface ◽  
Copper Dissolution ◽  
Basic Solutions

AbstractThe electrochemical behavior of Cu-10Ni-10Zn alloy and Cu was investigated in acidic, neutral and basic solutions. The effect of chloride ions in neutral solutions was also studied. Conventional electrochemical techniques and electrochemical impedance spectroscopy were used. The corrosion rate of these materials in acidic solutions is relatively high compared to that in neutral or basic solutions. The open-circuit potential of the alloy is nearly the same as that of pure copper in the different media, indicating that the processes which occur on the alloy surface are mainly governed by copper dissolution. In chloride solutions the rate of Cu corrosion is remarkably high. In the alloy, the copper dissolution was suppressed by the presence of nickel and zinc, due to the formation of complex oxide layers. The impedance data were fitted to equivalent circuit models that explain the different electrochemical processes occurring at the electrode/electrolyte interface. SEM and EDAX have shown that the alloy surface is enriched with Ni. In neutral solutions the chloride ions are penetrating the metallic surface.

Czochralski pulling of cobalt and of cobalt-rich cobalt/iron alloy crystals

1975 ◽  
Vol 30 (3) ◽  
pp. 327-334 ◽  
Author(s):  
K.J. Bachmann ◽  
T. Wakiyama
Keyword(s):  
Iron Alloy ◽  
Cobalt Iron

scholarly journals Magnesium Doped Hydroxyapatite-Based Coatings Obtained by Pulsed Galvanostatic Electrochemical Deposition with Adjustable Electrochemical Behavior

Coatings ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 727 ◽  
Author(s):  
Diana Maria Vranceanu ◽  
Ionut Cornel Ionescu ◽  
Elena Ungureanu ◽  
Mihai Ovidiu Cojocaru ◽  
Alina Vladescu ◽  
...  
Keyword(s):  
Phase Composition ◽  
Dissolution Rate ◽  
Electrochemical Deposition ◽  
Electrochemical Behavior ◽  
Body Fluid ◽  
Electrochemical Cell ◽  
Ph Value ◽  
Pure Water ◽  
Ultra Pure Water ◽  
Pulsed Mode

The aim of this study was to adapt the electrochemical behavior in synthetic body fluid (SBF) of hydroxyapatite-based coatings obtained by pulsed galvanostatic electrochemical deposition through addition of Mg in different concentrations. The coatings were obtained by electrochemical deposition in a typical three electrodes electrochemical cell in galvanic pulsed mode. The electrolyte was obtained by subsequently dissolving Ca(NO3)2·4H2O, NH4H2PO4, and Mg(NO3)2·6H2O in ultra-pure water and the pH value was set to 5. The morphology consists of elongated and thin ribbon-like crystals for hydroxyapatite (HAp), which after the addition of Mg became a little wider. The elemental and phase composition evidenced that HAp was successfully doped with Mg through pulsed galvanostatic electrochemical deposition. The characteristics and properties of hydroxyapatite obtained electrochemically can be controlled by adding Mg in different concentrations, thus being able to obtain materials with different properties and characteristics. In addition, the addition of Mg can lead to the control of hydroxyapatite bioactive ceramics in terms of dissolution rate.

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