Influence of Electrolytic Polishing and Anodic Passivation on Corrosion Resistance of Ti-15Mo Alloy

2015 ◽  
Vol 227 ◽  
pp. 499-502
Author(s):  
Dorota Babilas ◽  
Joanna Michalska ◽  
Elżbieta Pamuła ◽  
Wojciech Simka
Keyword(s):  
Corrosion Resistance ◽  
Chemical Composition ◽  
Oxalic Acid ◽  
Surface Morphology ◽  
Oxidation Process ◽  
Ammonium Fluoride ◽  
Physiological Solution ◽  
Anodic Passivation ◽  
Electrolytic Polishing ◽  
Anodic Oxidation Process

This paper presents the results of investigations on electrolytic polishing and anodic passivation of Ti-15Mo alloy. The influence of chemical composition of the bath used in electrolytic polishing and anodic passivation process on the morphology, wettability and corrosion resistance of the electrochemically modified vanadium-free Ti-15Mo alloy was presented. The electropolishing process was carried out in a solution containing: sulphuric acid, ethylene glycol, ammonium fluoride and oxalic acid. Moreover, the anodic oxidation process was carried out in a 1.0 M H2SO4, 1.0 M H3PO4and 0.5 M solution of K2SiO3and 5 g/dm3KOH. It was found that the electrolytic polishing and anodic passivation led to significant improvement of the surface morphology. The electrolytic polishing and anodic passivation of Ti-15Mo improved corrosion resistance of the alloy in contact with of Ringer's physiological solution. The samples anodised at 100 V in 1.0 M H3PO4presented the highest corrosion resistance.

scholarly journals Downscaled anodic oxidation process for aluminium in oxalic acid

2017 ◽  
Vol 181 ◽  
pp. 012044 ◽  
Author(s):  
M Sieber ◽  
R Morgenstern ◽  
D Kuhn ◽  
M Hackert-Oschätzchen ◽  
A Schubert ◽  
...  
Keyword(s):  
Oxalic Acid ◽  
Anodic Oxidation ◽  
Oxidation Process ◽  
Anodic Oxidation Process

Influence of the complexing agent sodium citrate on the chemical composition, surface morphology and corrosion resistance of Ni–Fe electrodeposits

2019 ◽  
Vol 97 (5) ◽  
pp. 230-236
Author(s):  
G. P. da Silva ◽  
R. N. de Lima ◽  
F. J. N. Santos ◽  
F. P. S. de Menezes ◽  
L. P. L. Morais ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Chemical Composition ◽  
Surface Morphology ◽  
Sodium Citrate ◽  
Complexing Agent

Structure and Properties of Electrolytic Zn-Mn Coatings Deposited by the Galvanostatic Method

2013 ◽  
Vol 203-204 ◽  
pp. 216-219
Author(s):  
Magdalena Popczyk ◽  
Katarzyna Wykpis ◽  
Bożena Bierska-Piech
Keyword(s):  
Corrosion Resistance ◽  
Phase Composition ◽  
Chemical Composition ◽  
Surface Morphology ◽  
Phase Structure ◽  
Single Phase ◽  
Structure And Properties ◽  
Protective Properties ◽  
Galvanostatic Method ◽  
Galvanostatic Conditions

The Zn-Mn coatings were deposited under galvanostatic conditions from a sulfate galvanic bath. The influence of thiocarbamide additions in the bath on surface morphology, chemical and phase composition and corrosion resistance of the electrolytic Zn-Mn coatings was investigated. On the basis of these investigations it was found that Zn-Mn coatings can be obtained by the galvanostatic method. Morphology and chemical composition of the electrolytic Zn-Mn coatings depend on the thiocarbamide concentration in the galvanic bath. XRD investigations of obtained coatings showed a single phase structure (α-Mn1.08Zn2.92). The additions of thiocarbamide improve the protective properties of the Zn-Mn coatings.

Study on Low TCR TaN Thin Film Resistors by D.C. Magnetron Sputtering

2014 ◽  
Vol 1082 ◽  
pp. 34-37 ◽  
Author(s):  
Bin Wang ◽  
Zhen Guo Song ◽  
Qian Tao Cao
Keyword(s):  
Thin Film ◽  
Surface Morphology ◽  
Magnetron Sputtering ◽  
Anodic Oxidation ◽  
Oxidation Process ◽  
Ceramic Substrates ◽  
Film Resistor ◽  
Thin Film Resistor ◽  
Thin Film Resistors ◽  
Anodic Oxidation Process

In this paper, TaN thin film were deposited on ceramic substrates by D.C. magnetron sputtering. The surface morphology of two types of TaN thin film resistors were investigated by SEM. The characteristics of the TaN thin film resistor was also studied. The key point was put on the TCR of the TaN thin film resistors. The resistors were trimmed by the autoxidation process and the anodic oxidation process, and the TCR values of about +21ppm/°C and-137.3ppm/°C in average have been achieved respectively.

scholarly journals Anodic Growth Behavior of TiO2 Nanotube Arrays with Process Parameter Control

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Wan-Tae Kim ◽  
Won-Youl Choi
Keyword(s):  
Anodic Oxidation ◽  
Pore Diameter ◽  
Oxidation Process ◽  
Ammonium Fluoride ◽  
Process Parameter ◽  
Process Time ◽  
Nanotube Arrays ◽  
Electrolyte Temperature ◽  
Vertically Aligned ◽  
Anodic Oxidation Process

TiO2 nanotube arrays are very attractive materials by their vertically aligned porous nanostructures. They are easy to make using an anodic oxidation process in organic and inorganic electrolytes containing halogen ions, like fluorine and chlorine. Their growth tendency, various microstructures of TiO2 nanotube arrays, was fabricated and analysed with controlling of anodic oxidation process parameter like applied voltage, process time, electrolyte temperature, concentration of ammonium fluoride and DI water in ethylene glycol electrolyte, voltage applying and dropping rate, grain orientation, and size of titanium foil. Pore diameter and length were controlled in the range of 16 nm to 178 nm and 0.2 μm to 14.6 μm, respectively. Some tendencies of their growth were observed with different anodic oxidation variables. This growth tendency of TiO2 nanotube arrays is should be considered before they used in many applications, and if optimal structure for each application was fabricated and used, they will show better performance.

Corrosion Resistance of Ti6Al7Nb Alloy after Various Surface Modifications

2015 ◽  
Vol 227 ◽  
pp. 483-486 ◽  
Author(s):  
Janusz Szewczenko ◽  
Marcin Basiaga ◽  
Marta Kiel-Jamrozik ◽  
Marcin Kaczmarek ◽  
Magdalena Grygiel
Keyword(s):  
Corrosion Resistance ◽  
Oxidation Process ◽  
Surface Modifications ◽  
Solution Concentration ◽  
Electrochemical Polishing ◽  
Steam Sterilization ◽  
Surface Pretreatment ◽  
Ringer’S Solution ◽  
Anode Oxidation ◽  
Anodic Oxidation Process

The influence of surface pretreatment prior to the anode oxidation of Ti6Al7Nb alloy samples on corrosion resistance was presented in the work. The preliminary surface treatments were: grinding, vibration machining, sandblasting and electrochemical polishing. Anodic oxidation process was carried out at different voltages. The final procedure of the surface modification was steam sterilization. The scope of the work included: corrosion resistance study (pitting and crevice) of both non-sterilized and sterilized samples, and samples after 28 days exposure to the Ringer’s solution, concentration evaluation of metal ions releasing from the sterilized surface as well as observations of surface topography. The research revealed a significant influence of surface pretreatment of Ti6Al7Nb alloy, prior to the anode oxidation and steam sterilization, on corrosion resistance.

Research Progress on Organic Additives in the Anodic Oxidation Process of Magnesium and its Alloys

2013 ◽  
Vol 341-342 ◽  
pp. 187-190
Author(s):  
Wei Zhang
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Anodic Oxidation ◽  
Oxidation Process ◽  
Physical And Mechanical Properties ◽  
Research Progress ◽  
Organic Additives ◽  
Oxidation Treatment ◽  
Anodic Oxidation Treatment ◽  
Anodic Oxidation Process

Magnesium and its alloys have excellent physical and mechanical properties for a number of applications. Unfortunately, magnesium and its alloys are highly susceptible to corrosion, which greatly restricts their further application. Anodic oxidation treatment is an effective method to improve the corrosion resistance of magnesium and its alloys. In the anodic oxidation process, organic additives have significantly effects on the performance of the oxide film. This paper reviews the research progress on organic additives, in order to provide some references for the research of the electrolyte in the anodic oxidation process of magnesium and its alloys.

The Influence of Sodium Molybdate on the Properties of Zn-Ni Layers Obtained by Electrolytic Deposition

2010 ◽  
Vol 636-637 ◽  
pp. 1053-1058 ◽  
Author(s):  
Katarzyna Wykpis ◽  
Antoni Budniok ◽  
Eugeniusz Łągiewka
Keyword(s):  
Corrosion Resistance ◽  
Chemical Composition ◽  
Surface Morphology ◽  
Electrochemical Impedance ◽  
Chemical Elements ◽  
Steel Substrate ◽  
Sodium Molybdate ◽  
Open Circuit ◽  
Electrolytic Deposition ◽  
Structural Investigations

This study was undertaken in the aim to try the limit of extraction of Zn from Zn-Ni system. The aim was realized by the addition of MoO42- ions into the galvanic bath containing Ni2+ and Zn2+ ions. Zn-Ni-Mo layers were deposited under galvanostatic conditions on (OH18N9) austenitic steel substrate. The influence of Na2MoO4 concentration in a bath on the surface morphology, chemical and phase composition and the corrosion resistance of obtained layers, was investigated. The properties of Zn-Ni-Mo layers were compared to the properties of electrolytic Zn-Ni layer. Structural investigations were performed by the X-ray diffraction (XRD) method. The surface morphology and chemical composition and surface chemical elements distribution of deposited layers were studied using a scanning electron microscope. Electrochemical corrosion resistance investigations were done by classical Stern method and electrochemical impedance spectroscopy. The potentiodynamic curves in the range of  0.05V to the potential of open circuit, were obtained. On the base of these curves the parameters like corrosion potential- Ecor, corrosion current density- icor and the polarization resistance- Rp were determined. These values served as a measure of the corrosion resistance of obtained layers. Results of impedance investigations were presented on the Nyquist Z”= f (Z’) and the Bode log Z = f (log) and  = f (log), diagrams. On the basis on this research, it was exhibited that surface morphology, chemical composition of Zn-Ni-Mo layers are dependent on Mo contents. The optimal content of Na2MoO4 in the bath for the sake of corrosion resistance in 5% NaCl, is found to be 1.2 gdm-3.

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