scholarly journals Corrosion Behavior and Morphology of Passive Films Modified with Zinc–Aluminum Simultaneous Treatment on Different Metals

Metals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 986
Author(s):  
Shenghan Zhang ◽  
Chenhao Sun ◽  
Jie Di ◽  
Yu Tan
Keyword(s):  
Energy Dispersive Spectrometry ◽  
Electrochemical Impedance ◽  
Electrochemical Corrosion ◽  
Corrosion Current ◽  
Passive Films ◽  
Composition Analysis ◽  
304L Stainless Steel ◽  
Simultaneous Treatment ◽  
Incoloy 800 ◽  
Corrosion Behaviors

Passive films were formed on A508-3 steel (A508-3), 304L stainless steel (304L) and Incoloy 800 (In800) with blank/zinc/zinc–aluminum treatments in air at 300 °C. The electrochemical corrosion behaviors of different metals were investigated through potentiodynamic polarization, electrochemical impedance spectroscopy and the Mott–Schottky technique. The morphology and composition of passive films were analyzed using scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS). The zinc–aluminum treatment effectively reduced the corrosion current and increased the impedance of A508-3 and 304L, but had a weak effect on In800. The zinc–aluminum treatment reduced the carrier concentration of A508-3 and changed the semiconductor property of 304L and In800. The order of zinc–aluminum treatment for improving the corrosion resistance of three metals was: A508-3 > 304L > In800. In addition, the zinc–aluminum treatment enhanced the density and smoothness of passive films. According to the composition analysis, spinel ZnAl2O4 was formed on three metals; however, the amount of spinel varied with the content of nickel and chromium in different metals, which affected the results of using this technology.

Interaction between Sodium Molybdate and FSWed Wled of 5083 Effected by Time

2013 ◽  
Vol 699 ◽  
pp. 645-649
Author(s):  
Chang Bin Shen
Keyword(s):  
Inhibition Efficiency ◽  
Electrochemical Impedance ◽  
Electrochemical Corrosion ◽  
Sodium Molybdate ◽  
Impedance Spectra ◽  
Electrochemical Impedance Spectra ◽  
Friction Stir ◽  
Base Materials ◽  
Corrosion Behaviors ◽  
5083 Aluminum Alloy

Similar welds composed of 5083 were produced by friction stir welding. In the solution of 0.2 M NaHSO3 and 0.6 M NaCl, with the addition of a given concentration sodium molybdate as the inhibitor, the electrochemical corrosion behaviors of the friction stir welds (FSW) and 5083 were comparatively investigated by potentiodynamic polarization curve tests and electrochemical impedance spectra (EIS) at the ambient temperature for different test periods. The results indicated that : with the extension of period, the inhibition efficiencies (IE) for both the weld and 5083 base materials enhanced, at the same period, the inhibition efficiency (IE) for the weld was beyond that for 5083 base materials, sodium molybdate may be thought of as an effective inhibitor for 5083 aluminum alloy, the interaction between inhibitor and weld is stronger than that between inhibitor and base materials.

scholarly journals Effect of Mechanical Surface Treatments on the Surface State and Passive Behavior of 304L Stainless Steel

Metals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 135
Author(s):  
Kathleen Jaffré ◽  
Benoît Ter-Ovanessian ◽  
Hiroshi Abe ◽  
Nicolas Mary ◽  
Bernard Normand ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Stainless Steel ◽  
Surface State ◽  
Electrochemical Impedance ◽  
Passive Films ◽  
Surface Finishing ◽  
Ultrafine Grain ◽  
304L Stainless Steel ◽  
Passive Behavior

The effect of dry grinding on 304L stainless steel’s passive behavior is compared to two other surface finishing (mechanical polishing down to 2400 with SiC emery paper and 1 µm with diamond paste, respectively). The characterization of the surface state was performed using scanning electron microscopy, transmission electron microscopy, 3D optical profilometer, and X-ray diffraction. Results indicate that each surface treatment leads to different surface states. The ground specimens present an ultrafine grain layer and a strong plastic deformation underneath the surface, while an ultrafine grain layer characterizes the subsurface of the polished specimens. Grinding induces high residual compressive stresses and high roughness compared to polishing. The characterization of the passive films was performed by electrochemical impedance spectroscopy and Mott–Schottky analysis. The study shows that the semiconductor properties and the thickness of the passive films are dependent on the surface state of the 304L stainless steel.

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.

scholarly journals A Novel Electroactive Imide Oligomer and Its Application in Anticorrosion Coating

Polymers ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 91 ◽  
Author(s):  
Bi-Sheng Huang ◽  
Guan-Hui Lai ◽  
Ta-I Yang ◽  
Mei-Hui Tsai ◽  
Yi-Chen Chou
Keyword(s):  
Corrosion Protection ◽  
Photoelectron Spectroscopy ◽  
Electrochemical Impedance ◽  
Surface Condition ◽  
Electrochemical Corrosion ◽  
Extended Period ◽  
Corrosion Current ◽  
Metal Corrosion ◽  
Superior Corrosion Resistance ◽  
Passive Metal

A novel aniline tetramer (AT) capped electroactive imide oligomer (EIO) for metal corrosion protection was successfully synthesized in this study. The chemical structure of the EIO was characterized by liquid chromatography-mass spectrometry and Fourier-transform infrared spectroscopy. Furthermore, the redox behavior of EIO was identified using electrochemical cyclic voltammetry studies. An EIO coated on a cold-rolled steel (CRS) electrode was found to possess superior corrosion resistance to polyimide (PI) on a series of electrochemical corrosion measurements in 3.5 wt.% NaCl solution over an extended period (30 days). The mechanism for the advanced corrosion protection of the PI coating on the CRS electrode could be attributed to the redox catalytic capabilities of the AT units present in the EIO. These capabilities may induce the formation of passive metal oxide layers on the CRS electrode. Scanning electron microscopy and X-ray photoelectron spectroscopy were used to analyze the surface condition of the CRS after the corrosion test. EIO- and PI-coated electrodes were identified by a series of electrochemical measurements, including corrosion potential (Ecorr), polarization resistance (Rp), and corrosion current (Icorr) measurements, along with electrochemical impedance spectroscopy (EIS).

Electrochemical Behaviors of Die-Cast Mg-4Al-0.4Mn-Xpr (x=0, 1, 4) Alloys in NaCl Solution

2013 ◽  
Vol 690-693 ◽  
pp. 82-88
Author(s):  
Xiao Dong Niu ◽  
Wei Sun ◽  
Xin Qiu ◽  
Jian Meng ◽  
Jian An
Keyword(s):  
Electrochemical Impedance ◽  
Electrochemical Corrosion ◽  
Open Circuit ◽  
Nacl Solution ◽  
Electrochemical Behaviors ◽  
Β Phase ◽  
Die Cast ◽  
Corrosion Behaviors ◽  
Potential Test

The microstructures and electrochemical corrosion behaviors of die-cast Mg-4Al-0.4Mn-xPr (x=0, 1, 4 wt.%) alloys have been investigated. Electrochemical behaviors of all alloys are described by open circuit potential test, potentiodynamic polarization test and electrochemical impedance spectroscope in 3.5 wt.% NaCl solution. The results show that the α-Mg grain is refined and the continuous net β phase appears gradually with increasing the content of Pr in the Mg-4Al-0.4Mn alloys. Moreover, the β phase plays a role of galvanic cathode in AM40 alloy and corrosion barrier in Pr-containing alloys, respectively. Electrochemical measurements show that Pr can improve corrosion resistance of Mg-4Al-0.4Mn alloy in the 3.5 wt.% NaCl solution, and corrosion rate decreases with increasing Pr content.

Study on Corrosion Behaviors of Epoxy Aluminum Coating Immersed in 3.5%NaCl Solution

2014 ◽  
Vol 912-914 ◽  
pp. 338-341 ◽  
Author(s):  
Rui Yan ◽  
Ting Liang ◽  
Hong Chun Ren ◽  
Jin Gu ◽  
Zhuang Zhou Ji
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Osmotic Pressure ◽  
Electrochemical Impedance ◽  
Electrochemical Corrosion ◽  
Aluminum Coating ◽  
Nacl Solution ◽  
Metal Interface ◽  
Electrochemical Corrosion Behavior ◽  
Corrosion Behaviors

Electrochemical corrosion behavior of epoxy aluminum coating immersed in 3.5%NaCl solution was investigated using electrochemical impedance spectroscopy (EIS). SEM was also used to analyze the surface images of coating, and the failure mechanism was discussed as well. The experimental results showed that corrosive species can penetrate into coatings and reach the coating/substrate interface promptly, causing the decrease of electro-resistance and the beginning of electrochemical corrosion at the coatings/metal interface. The coating was compact and continuous at beginning, while the blisters and cavities appeared after corrosion, which were formed osmotic pressure created by corrosion species penetration.

Effects of alkaline zinc bath formulations on electrochemical corrosion behavior of electrogalvanized coatings

CORROSION ◽  
10.5006/3760 ◽  
2021 ◽  
Author(s):  
Thanyalux Wanotayan ◽  
Tongjai Chookajorn ◽  
Sirikarn Sattawitchayapit ◽  
Piya Khamsuk ◽  
Kanokwan Saengkiettiyut ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Surface Morphology ◽  
Electrochemical Impedance ◽  
Texture Coefficient ◽  
Electrochemical Corrosion ◽  
Corrosion Current ◽  
Plating Bath ◽  
Zinc Plating ◽  
Electrochemical Corrosion Behavior ◽  
Zinc Coatings

The effects of alkaline non-cyanide zinc plating bath formulation on the plating characteristics and deposit properties are investigated. Scanning electron microscope and X-ray diffractometer are used to study the surface morphology and texture of the zinc deposits respectively. Uniform and compact coatings with a dominant (110) texture are obtained for all of the bath formulations. Nevertheless, significant differences in surface morphology and relative preferences for the (110) and (100) planes were found to result from the concentrations of zinc and sodium hydroxide in the bath. Electrochemical impedance spectroscopy and potentiodynamic polarization scan were employed to evaluate the corrosion resistance. The coatings with a moderate Zn (8-11 g/L) and controlled NaOH (120 g/L) contents show good corrosion resistance, with the corrosion current and corrosion rate being the lowest at 8 g/L of Zn and 120 g/L of NaOH. The ratio of texture coefficient, morphology, and compressive residual stress from different bath composition contribute to the corrosion resistant property. The findings from this work should provide useful information of electrogalvanized zinc coatings with enhanced corrosion resistance.

Effects of Temperature on Corrosion Behavior of X70 Steel in Halons

2011 ◽  
Vol 311-313 ◽  
pp. 996-1000 ◽  
Author(s):  
Jing Xu ◽  
Jian Wei Yang ◽  
Jian Ping Cao ◽  
Chen Chen
Keyword(s):  
Corrosion Behavior ◽  
Polarization Curve ◽  
Corrosion Test ◽  
Electrochemical Impedance ◽  
Pipeline Steel ◽  
Electrochemical Corrosion ◽  
Corrosion Current ◽  
X70 Pipeline Steel ◽  
Cathode Reaction ◽  
Immersion Corrosion

The corrosion behavior of X70 pipeline steel in 0.5% NaC1 solution in different temperature of 25°C、35°C and 55°C was studied by dynamic potential polarization curve and electrochemical impedance spectroscopy（EIS）method. The corrosion topography of X70 pipeline steel in normal temperature and 30°C was also compared in immersion corrosion test after 25 days. The results show that when the temperature rises, the corrosion current density Icorr increases, the linear polarization resistance reduces, cathode polarization curve right shift, caused corrosion rate increases which primarily by the increasing the transmission of reactant in the cathode reaction. Pitting corrosion developed after 25 days immersion corrosion in 30°C solution which proved the promoter action of temperature to pit corrosion, and which is agreed with the electrochemical corrosion test results.

Electrochemical corrosion study of Pb-free solders

2006 ◽  
Vol 21 (1) ◽  
pp. 62-70 ◽  
Author(s):  
B.Y. Wu ◽  
Y.C. Chan ◽  
M.O. Alam ◽  
W. Jillek
Keyword(s):  
Acid Solution ◽  
Corrosion Behavior ◽  
Current Density ◽  
Corrosion Potential ◽  
Electrochemical Impedance ◽  
Electrochemical Corrosion ◽  
Corrosion Current ◽  
Corrosion Properties ◽  
Linear Polarization Resistance ◽  
Eis Measurements

This paper presents an investigation on the corrosion behavior of five solders by means of polarization and electrochemical impedance spectroscopy (EIS) measurements. The Sn–9Zn and Sn–8Zn–3Bi solder, in comparison with the Sn–3.5Ag–0.5Cu and Sn–3.5Ag–0.5Cu–9In solder, were tested in 3.5 wt% NaCl solution and 0.1 wt% adipic acid solution, respectively. The Sn–37Pb solder was for reference in this work. The polarization curves indicated that the Sn–9Zn and Sn–8Zn–3Bi solder showed the worst corrosion resistance both in the salt and acid solutions, in terms of corrosion-current density, corrosion potential, linear polarization resistance, and passivation-current density. Meanwhile, the Sn–3.5Ag–0.5Cu solder remained the best corrosion characteristics in both solutions. It was found that due to microstructure alteration, Bi additive to the Sn–9Zn solder improved the corrosion behavior in the salt solution, whereas decreased that in the acid solution. However, the additive of In degraded the Sn–3.5Ag–0.5Cu solder in both solutions. The EIS results agreed well with the noble sequence of the five solders subjected to the two solutions with polarization. The equivalent circuits were also determined. Nevertheless, the four Pb-free solders exhibited acceptable corrosion properties since there was not much difference of key corrosion parameters between them and the Sn–37Pb solder.

Electrochemical Corrosion Behaviors of CuZrHfTi Bulk Metallic Glasses in NaOH Solution

2012 ◽  
Vol 178-181 ◽  
pp. 1075-1078
Author(s):  
Bin Sun ◽  
Wen Yong Zhang ◽  
Jin Bin Lu
Keyword(s):  
Corrosion Resistance ◽  
Current Density ◽  
Metallic Glasses ◽  
Electrochemical Impedance ◽  
Bulk Metallic Glasses ◽  
Electrochemical Corrosion ◽  
Transfer Resistance ◽  
Naoh Solution ◽  
Corrosion Behaviors ◽  
Passivation Current Density

The electrochemical corrosion behaviors of Cu60Zr30-xHfxTi10(x=10,15,20) bulk metallic glasses (BMGs) were investigated in 3 mol/L NaOH solution by potentiodynamic polarization experiments and electrochemical impedance spectroscopy (EIS). The results showed that the BMGs had sufficient corrosion resistance in NaOH solution. The anodic showed grading passivation character, and the passivation current density were very low. The corrosion resistance changed with Hf content changing. The passivation current density of Cu60Zr15Hf15Ti10 alloy was lowest and the charge transfer resistance was largest, which means the best corrosion resistance for CuZrHfTi BMGs. Corrosion mechanisms were not changed, while the corrosion resistance decrease after crystallized for the BMGs.

Sign in / Sign up

Export Citation Format

Share Document