Comparison of Corrosion Behavior of Thin Layers from Copper, Aluminum and Chromium

2013 ◽  
Vol 837 ◽  
pp. 247-252 ◽  
Author(s):  
Mihaela Luminita Barhalescu
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Potential ◽  
Sea Water ◽  
Process Analysis ◽  
Electrochemical Corrosion ◽  
Thin Layers ◽  
Polarization Curves ◽  
General Corrosion ◽  
Electrical Discharges ◽  
Cyclic Polarization

The aim of this research is to determine the corrosion resistance on superficial layers laid-down through electrical sparking on the steel carbon OLC 45 samples, the used electrode being made from corrosion resistant material (Aluminum, Copper and Chromium). The superficial treatment through impulse electrical discharges is a procedure through which the proprieties of the metallic materials can be improved. The proprieties of the superficial layers obtained through this procedure are the same as the electrodes material being used or very close to this one, the properties resulting from micro alloying and the diffusion of the electrode material in the sample of steel. The experiments were done, for the superficial treatment through impulse electrical discharges, using Al, Cu and Cr electrodes. The corrosion speed was determinate through electrochemical corrosion. The corrosion potential and marking the polarization curves (linear and cyclic) was determined with an advanced electrochemical system type VOLTALAB 32. The acquisition and processing of experimental data was made with the help of the specialized software VOLTMASTER 2. The corrosion potential was determined by tracing the curves of linear polarization, recorded in sea water, using the Evans coordinates: E = f (log I). The corrosion process analysis was made also based on the cyclic polarization curves. The fine determining of the topography surfaces exposed to the action of the corrosive environment was made using the atomic force microscope (AFM). The support but also the sparking probes, has present the same type of corrosion; a general corrosion, which in the initial moments is represented by the appearance of corrosion dots. The superficial layers laid through Cr, Al and Cu electrodes sparking proves a improved corrosion resistance to see water compared to the base steel. Aluminium has the highest corrosion tendency while copper has the best protection.

An Electrochemical Evaluation of 3003, 3004, and 5050 Aluminum Alloys for Desalination

CORROSION ◽  
1974 ◽  
Vol 30 (2) ◽  
pp. 53-59 ◽  
Author(s):  
R. A. BONEWITZ
Keyword(s):  
Aluminum Alloys ◽  
Anodic Polarization ◽  
Corrosion Potential ◽  
Sea Water ◽  
Polarization Curves ◽  
General Corrosion ◽  
Corrosion Rates ◽  
Electrochemical Evaluation

Abstract Aluminum alloys 3003, 3004, and 5050 were evaluated for desalination applications by means of their anodic polarization curves determined in 1X synthetic sea water at 25 C (77 F) to 150 C (302 F). Pitting performance was established from the relative values of the corrosion potential and the breakdown and protection potentials, and general corrosion rates were calculated from corrosion currents determined by the slop-intercept method. Pitting is not anticipated for 3003 and 3004 alloys at temperatures to 150 C and for 5050 alloy to 125 C (257 F). General corrosion rates for these alloys were less than 1 mpy.

CARLSON ALLOY 90 10 CuNi

Alloy Digest ◽  
1995 ◽  
Vol 44 (5) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Sea Water ◽  
General Corrosion ◽  
Good Resistance

Abstract 90-10 Cupro-nickel is a highly ductile, malleable and corrosion resisting alloy, suitable for water applications. The alloy has approximately 1.4% iron to improve its resistance to sea water. It has good resistance to general corrosion and erosion. Easily fabricated. Readily weldable. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on corrosion resistance. Filing Code: CU-600. Producer or source: G.O. Carlson Inc.

Influences of Grain Size on Electrochemical Corrosion Behaviors of Nickel-Based Alloy 718

2016 ◽  
Vol 852 ◽  
pp. 105-112 ◽  
Author(s):  
Yan Mo ◽  
Dong Zhe Wang ◽  
Bin Jiang ◽  
Yong You Li ◽  
Hai Ding Liu ◽  
...  
Keyword(s):  
Grain Size ◽  
Corrosion Resistance ◽  
Sea Water ◽  
Electrochemical Impedance ◽  
Electrochemical Corrosion ◽  
Structure Design ◽  
Coarse Grained ◽  
Alloy 718 ◽  
Corrosion Behaviors ◽  
Nickel Based Alloy

With the application upgrade of alloy 718 in the marine oil exploitation, higher corrosion resistance demands has been presented for structure design and reasonable material application of drilling and production equipments; thus there is an urgent need to understand influences of grain size on corrosion behavior of such alloy in sea water environment. In this experiment, different solution treatments are applied to nickel-based alloy 718. As a result, specimens with grain size varied from ASTM No. 9 to No. 3.5 grades. The influences of grain size on the electrochemical behaviors in simulated sea water (3.5% sodium chloride solution) are investigated using electrochemical impedance spectroscopy and polarization curves. Alloy 718 shows good corrosion resistance in this electrolyte solution, however, grain size still has an effect on its electrochemical corrosion behaviors to a certain extent. With the time going, testing results show that coarse-grained alloys with larger grain size have higher impedance values and smaller corrosion current densities, indicating a better corrosion resistance than fine-grained specimens. However, when the grain size increases further, the corrosivity resistant nature of alloy 718 would decline. Testing results show that specimen with size of ASTM No. 5 has the best corrosion resistance.

Study on Anodic Oxidation of 2024 Aluminum Alloys in Sulfuric-Citric Acid

2014 ◽  
Vol 788 ◽  
pp. 236-242 ◽  
Author(s):  
Xiang Feng Meng ◽  
Guo Ying Wei ◽  
Xi Xi Zhao ◽  
Hong Liang Ge
Keyword(s):  
Corrosion Resistance ◽  
Citric Acid ◽  
Anodic Oxidation ◽  
Corrosion Potential ◽  
Electrochemical Corrosion ◽  
Mixed Solution ◽  
Nacl Solution ◽  
Maximum Hardness ◽  
Anodized Aluminum ◽  
Electrochemical Corrosion Resistance

Porous anodic alumina has been obtained through anodic oxidation in a mixed solution of sulfuric and citric acid. We investigated the microstructure and morphology of 2024 aluminum after being anodically oxidized under different voltage and temperature. Hardness and corrosion resistance of anodized aluminum has been also investigated. The results show that after anodization, many nanoholes appeared on the surface layer of the coating. Thickness of the anodized film increased from 2.7μm to 26.3μm with the voltage changing from 10 V to 18 V. Aodized films with the thickness of 18μm could be obtained under the temperature of 47°C. When the oxidation voltage is 12V, the hardness of the oxidation film reached 126HV. Maximum hardness (130 HV) could be achieved when the oxidation temperature was 57°C. After being dealt with in the NaCl solution, the electrochemical corrosion resistance of the anodic film got a sharp increase, and the anodic oxidation voltage had a great impact on the anodized film. When the oxidation voltage was 16V, the corrosion resistance of the film reached the highest value and the corrosion voltage was-0.7V. From the polarization curves, it has been found that the films obtained under the temperature of 37°C possessed more positive corrosion potential (-0.73V) and optimal anticorrosion performance.

Characteristics of Inconel 625 Filler Metal Affecting to Weld and Deposited Metal Zones in the Case of Welded to Forged Steel for Piston Crown Material

2014 ◽  
Vol 1004-1005 ◽  
pp. 1114-1119
Author(s):  
Sung Yul Lee ◽  
Kyung Man Moon ◽  
Jong Pil Won ◽  
Jae Hyun Jeong ◽  
Tae Sil Baek
Keyword(s):  
Corrosion Resistance ◽  
Weld Metal ◽  
Base Metal ◽  
Anodic Polarization ◽  
Corrosion Potential ◽  
Filler Metal ◽  
Polarization Curves ◽  
Inconel 625 ◽  
Piston Crown ◽  
Deposited Metal

Recently, wear and corrosion of the engine parts surrounded with combustion chamber is more serious compared to the other parts of the engine due to using of heavy oil of low quality. Therefore, an optimum repair welding for these parts is very important to prolong their lifetime in a economical point of view. In this study, Inconel 625 filler metal was welded with GTAW method in the forged steel which would be generally used with piston crown material. In this case, the mechanical and corrosion properties between weld metal zone (WM) welded to the groove which were artificially made in the base metal and deposited metal zone (DM) only welded by Inconel 625 filler metal on the surface of the base metal were investigated using electrochemical methods, such as measurement of corrosion potential, anodic polarization curves, cyclic voltammogram and impedance etc. in 35% H2SO4 solution. The deposited metal zone exhibited a better corrosion resistance compared to the weld metal zone, furthermore, its corrosion potential was a nobler value rather than that of the weld metal zone. However, the hardness indicated more or less higher value in the weld metal zone. The corrosive products after measurement of anodic polarization curves was hardly observed both in the weld and deposited zones, while, the morphologies of the corroded surfaces exhibited general and pitting corrosion in the weld and deposited metal zones respectively. The fine pearlite microstructure was a little observed in the weld metal zone, moreover, the microstructure of ferrite with elliptical pattern was significantly increased in the deposited metal zone. As a result, it is considered that the amount of Cr, Mo and Ni having a high corrosion resistance diffuse and migrate from the weld metal zone to the base metal zone, thus, the deposited metal zone indicated a better corrosion resistance than the weld metal zone because the amount of Cr, Mo and Ni were much involved in deposited metal zone compared to the weld metal zone.

scholarly journals Corrosion Performance of Fe-Cr-Ni Alloys in Artificial Saliva and Mouthwash Solution

2015 ◽  
Vol 2015 ◽  
pp. 1-14 ◽  
Author(s):  
J. Porcayo-Calderon ◽  
M. Casales-Diaz ◽  
V. M. Salinas-Bravo ◽  
L. Martinez-Gomez
Keyword(s):  
Corrosion Resistance ◽  
Stainless Steels ◽  
Artificial Saliva ◽  
Electrochemical Techniques ◽  
Austenitic Stainless Steels ◽  
Open Circuit ◽  
Polarization Curves ◽  
Cyclic Polarization ◽  
Order Of Magnitude ◽  
Dental Applications

Several austenitic stainless steels suitable for high temperature applications because of their high corrosion resistance and excellent mechanical properties were investigated as biomaterials for dental use. The steels were evaluated by electrochemical techniques such as potentiodynamic polarization curves, cyclic polarization curves, measurements of open circuit potential, and linear polarization resistance. The performance of steels was evaluated in two types of environments: artificial saliva and mouthwash solution at 37°C for 48 hours. In order to compare the behavior of steels, titanium a material commonly used in dental applications was also tested in the same conditions. Results show that tested steels have characteristics that may make them attractive as biomaterials for dental applications. Contents of Cr, Ni, and other minor alloying elements (Mo, Ti, and Nb) determine the performance of stainless steels. In artificial saliva steels show a corrosion rate of the same order of magnitude as titanium and in mouthwash have greater corrosion resistance than titanium.

The Effect of Cover Thickness to Corrosion Characteristics of Reinforced Steel Bar Emedded in Mortar Specimen (W/C:0.6) Aged 5 Years in Seawater

2013 ◽  
Vol 785-786 ◽  
pp. 1176-1180 ◽  
Author(s):  
Sung Yul Lee ◽  
Jong Pil Won ◽  
Dong Hyun Park ◽  
Myeong Hoon Lee ◽  
Kyung Man Moon
Keyword(s):  
Corrosion Resistance ◽  
Polarization Resistance ◽  
Corrosion Potential ◽  
Polarization Curves ◽  
Cyclic Voltammograms ◽  
Economic Point ◽  
Mortar Specimen ◽  
Steel Bar ◽  
Reinforced Steel ◽  
Cover Thickness

Reinforced concrete structures have been increasingly widely used through numerous industrial fields. These structures are often exposed to severely corrosive environments such as sea water, contaminated water, acid rain, and the seashore. Thus, corrosion problems of the steel bars embedded in concrete are very important from a safety and economic point of view. In this study, the effects of cover thickness on the corrosion properties of reinforced steel bar embedded in mortar specimen (W/C:0.6) were investigated using electrochemical methods such as corrosion potentials, polarization curves, cyclic voltammograms, galvanostat and potentiostat. Corrosion potentials shifted to the noble direction, and the value of AC impedance also exhibited a higher value with increasing cover thickness, furthermore, polarization resistance also increased with increasing cover thickness. This is probably that the thinner cover thickness, seawater solution is easy to arrive at embedded steel compared to other thicker cover thickness, so, its steel bar may be easily corroded due to chloride ion, which is resulted in shifting corrosion potential to negative direction, decreasing polarization resistance. Consequently, it is considered that the relation between corrosion resistance of reinforced steel and cover thickness is nearly matched with each other. However, its corrosion resistance estimated by measurement of corrosion potential was not well in agreement with value obtained by polarization curves.

The Preparation of Coatings with Codepositon Plating on A3 Steel and its Corrosion Resistance

2010 ◽  
Vol 150-151 ◽  
pp. 1034-1038
Author(s):  
Shang Dong Chen ◽  
Ting Sun ◽  
Hong Nian
Keyword(s):  
Corrosion Resistance ◽  
Polarization Resistance ◽  
Polarization Effect ◽  
Corrosion Potential ◽  
Steel Substrate ◽  
Electrochemical Corrosion ◽  
Corrosion Current ◽  
Plain Carbon Steel ◽  
Cathode Polarization ◽  
Electrochemical Corrosion Behavior

A new method for preparation of coatings with codeposition plating on the ordinary A3 steel and heat treatment later. Research the coatings on electrochemical corrosion behavior variation in Q-sun. Results show that corrosion potential shuffle, corrosion current density reduced nearly two number magnitudes value, polarization resistance increased, the cathode polarization effect enhanced obviously in polarization curves, and self-corrosion current reduced, impedance increased twenty times in alternating current impedance atlas than A3 steel substrate without coatings. It was indicated that the coating improve effectively the corrosion resistance of plain carbon steel.

Salt spray corrosion and electrochemical corrosion performances of Dacromet fabricated Zn–Al coating

2019 ◽  
Vol 66 (5) ◽  
pp. 565-572
Author(s):  
Xiaoxiao Liu ◽  
Dejun Kong
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Product ◽  
Cathodic Protection ◽  
Corrosion Potential ◽  
Salt Spray ◽  
Electrochemical Corrosion ◽  
Corrosion Mechanism ◽  
Content Type ◽  
Salt Spray Corrosion ◽  
Al Coating

Purpose This study aims to investigate the salt spray corrosion (SSC) and electrochemical corrosion of obtained Zn–Al coating, which provided a basis for comprehensive analysis of corrosion behavior of Zn–Al coating. Design/methodology/approach A Zn–Al coating was fabricated on Q235A steel using a Dacromet method. The SSC and electrochemical corrosion performances in 3.5 Wt.% NaCl solution were investigated using an SSC chamber and electrochemical workstation, respectively, and the corrosion mechanism of Zn–Al coating was discussed. Findings The Dacromet fabricated Zn–Al coating is primarily composed of Zn and Al phases, its residual stress of −11.1 ± 4 MPa is compressive stress, which is beneficial to improve its corrosion resistance. In the SSC process, the corrosion product of Zn5(OH)8Cl2H2O enhances the corrosion resistance of Zn–Al coating, which provides sufficient cathodic protection for the substrate. The corrosion potential of Zn–Al coating is lower than that of substrate, which provides sufficient cathodic protection to the substrate, the Zn–Al coating in the immersion periods is protected by the corrosion product and Zn–Al sheets. Originality/value In this study, a Zn–Al coating was first fabricated on Q235A steel using a Dacromet method.

Electrochemical Corrosion Behavior of AZ80 Magnesium Alloy Tube Fabricated by Hydrostatic Extrusion

2014 ◽  
Vol 624 ◽  
pp. 77-81
Author(s):  
Zhi Lin Wu ◽  
Duo Xiang Wu ◽  
Ren Shu Yuan ◽  
Lei Zhao ◽  
Yan Bao Zhao
Keyword(s):  
Corrosion Resistance ◽  
Electrochemical Impedance Spectroscopy ◽  
Magnesium Alloy ◽  
Impedance Spectroscopy ◽  
Corrosion Behavior ◽  
Electrochemical Impedance ◽  
Electrochemical Corrosion ◽  
Hydrostatic Extrusion ◽  
Polarization Curves ◽  
Az80 Magnesium Alloy

The corrosion behavior of hydrostatic extruded tube AZ80 magnesium alloy was investigated by polarization curves and electrochemical impedance spectroscopy (EIS) in simulated atmosphere. The results indicated that, the corrosion resistance of the hydrostatic extruded AZ80 magnesium alloy with uneven deformed grains and increased sub-grains were obviously weakened, with larger corrosion current density in the polarization curves and lower corrosion resistances in the electrochemical impedance spectroscopy plots. This was mainly because of the hydrostatic extrusion which made AZ80 magnesium alloy within large numbers of dislocation tangles. So the residual stress increased the electrochemical activity of magnesium alloy which reduced the corrosion resistance of magnesium alloys.

Sign in / Sign up

Export Citation Format

Share Document