Immersion corrosion behavior, electrochemical performance and corrosion mechanism of subsonic flame sprayed FeCoCrMoSi amorphous coating in 3.5% NaCl solution

2021 ◽  
Author(s):  
Weicheng Kong ◽  
Kangmei Li ◽  
Jun Hu
Keyword(s):  
Electrochemical Performance ◽  
Corrosion Behavior ◽  
Corrosion Mechanism ◽  
Amorphous Coating ◽  
Nacl Solution ◽  
Immersion Corrosion

Investigation on the Corrosion Behavior of Zn27Al3Cu Alloy in 3.5 wt.% NaCl Solution

2012 ◽  
Vol 482-484 ◽  
pp. 537-540
Author(s):  
Yong Tan ◽  
Cheng Gang Hao ◽  
De Zhi Li ◽  
Zhi Liu Hu ◽  
Jian Min Zeng
Keyword(s):  
Weight Loss ◽  
Corrosion Behavior ◽  
Corrosion Products ◽  
Corrosion Mechanism ◽  
Attenuation Relationship ◽  
Nacl Solution ◽  
Cu Alloy ◽  
Weight Loss Method ◽  
Loss Method ◽  
Scanning Electron

The corrosion behavior of Zn27Al3Cu in 3.5 Wt.% NaCl solution is investigated through weight loss method. The morphology of corrosion products were observed and analyzed with optical microscopy (OM), scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS). The experimental results indicate that weight loss of the alloy with time follows the exponential attenuation relationship. Corrosion mechanism of Zn27Al3Cu alloy are intergranular corrosion and preferential corrosion in 3.5 Wt.% NaCl solution, the main corrosion products are compound oxide and chloride.

The Chloride Corrosion Behavior of Silver-base Casting Alloys

1979 ◽  
Vol 58 (6) ◽  
pp. 1572-1577 ◽  
Author(s):  
N.K. Sarkar ◽  
R.A. Fuys ◽  
J.W. Stanford
Keyword(s):  
Corrosion Behavior ◽  
Electrochemical Reactions ◽  
Corrosion Mechanism ◽  
Nacl Solution ◽  
Dental Casting ◽  
Casting Alloys ◽  
Chloride Corrosion ◽  
Silver Palladium ◽  
Dental Casting Alloys

The chloride corrosion behavior of five silver-palladium dental casting alloys was investigated in a 1% NaCl solution through the use of electrochemical hysteresis technique. The corrosion mechanism has been interpreted in terms of the microstructure of these alloys and their possible electrochemical reactions.

scholarly journals The Corrosion Resistance and Mechanism of AT13/Fe-Based Amorphous Composite Coatings

Micromachines ◽  
2021 ◽  
Vol 13 (1) ◽  
pp. 56
Author(s):  
Zhenhua Chu ◽  
Shikun Teng ◽  
Yuyun Zhou ◽  
Xingwei Zheng ◽  
Jingxiang Xu ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Composite Coatings ◽  
High Strength ◽  
Corrosion Current ◽  
High Wear Resistance ◽  
Corrosion Mechanism ◽  
Amorphous Coating ◽  
Immersion Corrosion ◽  
Long Time ◽  
Glassy Coating

Due to high strength, high wear resistance and high corrosion resistance, the amorphous metallic glasses were investigated widely. In the present study, the corrosion resistance of amorphous coating and composite coatings with various proportions of AT13 (Al2O3–13 wt.% TiO2) ceramic as additions in 3.5 wt.% NaCl solution were studied. The corrosion resistance was improved obviously as the addition of AT13, and when the content of AT13 was 15 wt.%, the composite coating had the lowest corrosion current density (1.75 × 10−6 A cm−2) and the highest corrosion potential (−411 mV), which was 5.14 × 10−5 A cm−2 and −580 mV for Fe-based metallic glassy coating, respectively. The corrosion mechanism was proposed according to the long-time immersion corrosion test.

scholarly journals Electrochemical Corrosion Behavior of Ni-Fe-Co-P Alloy Coating Containing Nano-CeO2 Particles in NaCl Solution

Materials ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 2614 ◽  
Author(s):  
Xiuqing Fu ◽  
Wenke Ma ◽  
Shuanglu Duan ◽  
Qingqing Wang ◽  
Jinran Lin
Keyword(s):  
Composite Coating ◽  
Corrosion Behavior ◽  
Electrochemical Impedance ◽  
Electrochemical Corrosion ◽  
Alloy Coating ◽  
Charge Transfer Resistance ◽  
Corrosion Mechanism ◽  
Nacl Solution ◽  
Transfer Resistance ◽  
Electrochemical Corrosion Behavior

In order to study the effect of nano-CeO2 particles doping on the electrochemical corrosion behavior of pure Ni-Fe-Co-P alloy coating, Ni-Fe-Co-P-CeO2 composite coating is prepared on the surface of 45 steel by scanning electrodeposition. The morphology, composition, and phase structure of the composite coating are analyzed by means of scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD). The corrosion behavior of the coatings with different concentrations of nano-CeO2 particles in 50 g/L NaCl solution is studied by Tafel polarization curve and electrochemical impedance spectroscopy. The corrosion mechanism is discussed. The experimental results show that the obtained Ni-Fe-Co-P-CeO2 composite coating is amorphous, and the addition of nano-CeO2 particles increases the mass fraction of P. With the increase of the concentration of nano-CeO2 particles in the plating solution, the surface flatness of the coating increases. The surface of Ni-Fe-Co-P-1 g/L CeO2 composite coating is uniform and dense, and its self-corrosion potential is the most positive; the corrosion current and corrosion rate are the smallest, and the charge transfer resistance is the largest, showing the best corrosion resistance.

Cavitation Corrosion Behavior of Anodized Aluminum Alloy

CORROSION ◽  
2011 ◽  
Vol 67 (9) ◽  
pp. 095003-095003-5 ◽  
Author(s):  
X. Yong ◽  
C. Hou ◽  
J. Wu ◽  
Z. Zhang ◽  
D. Li
Keyword(s):  
Aluminum Alloy ◽  
Corrosion Behavior ◽  
Electrochemical Impedance ◽  
Electrochemical Corrosion ◽  
Porous Electrodes ◽  
Corrosion Mechanism ◽  
Nacl Solution ◽  
Anodized Aluminum ◽  
Three Stages ◽  
Cathodic And Anodic Processes

Abstract The cavitation corrosion behavior and surface morphology of anodized aluminum alloy in 3.5% sodium chloride (NaCl) solution were investigated using weight loss and scanning electron microscopy. The electrochemical corrosion mechanism during cavitation corrosion was studied using electrochemical polarization and electrochemical impedance spectroscopy (EIS). The cavitation corrosion process could be divided into three stages: quick removal of the porous outer layer, slowly fragmenting and removing of the dense inner layer, and fast erosion of the aluminum alloy. Increasing the thickness of the anodized layer improved the cavitation corrosion resistance of the anodized aluminum alloy. Electrochemical corrosion processes under cavitation conditions were controlled by mixed cathodic and anodic processes. EIS spectra of anodized aluminum alloy under cavitation conditions resembled those from porous electrodes. Cavitation accelerated the electrochemical corrosion. Cavitation corrosion of anodized aluminum alloy showed strong synergism between mechanical and electrochemical corrosion factors.

scholarly journals Comparison on the immersion corrosion and electrochemical corrosion resistance of WC–Al2O3 composites and WC–Co cemented carbide in NaCl solution

RSC Advances ◽  
2021 ◽  
Vol 11 (36) ◽  
pp. 22495-22507
Author(s):  
Bin Han ◽  
Weiwei Dong ◽  
Bowen Fan ◽  
Shigen Zhu
Keyword(s):  
Corrosion Resistance ◽  
Electrochemical Corrosion ◽  
Cemented Carbide ◽  
Corrosion Mechanism ◽  
Nacl Solution ◽  
Immersion Corrosion ◽  
Electrochemical Corrosion Resistance

WC–Al2O3 composites possess higher corrosion resistance compared with WC–Co cemented carbide. The main corrosion mechanism for WC–Al2O3 composites is the oxidation of the WC phase.

scholarly journals The Effect of Immersion Corrosion Time on Electrochemical Corrosion Behavior and the Corrosion Mechanism of EH47 Ship Steel in Seawater

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1317
Author(s):  
Hongmei Zhang ◽  
Ling Yan ◽  
Yangyang Zhu ◽  
Fangfang Ai ◽  
Hongnan Li ◽  
...  
Keyword(s):  
Corrosion Behavior ◽  
Immersion Time ◽  
Electrochemical Impedance ◽  
Electrochemical Corrosion ◽  
Corrosion Current ◽  
Open Circuit ◽  
Corrosion Mechanism ◽  
Immersion Corrosion ◽  
Electrochemical Corrosion Behavior ◽  
Corrosion Time

In this paper, electrochemical corrosion tests and full immersion corrosion experiments were conducted in seawater at room temperature to investigate the electrochemical corrosion behavior and the corrosion mechanism of high-strength EH47. The polarization curve, EIS (electrochemical impedance spectroscopy), SEM (scanning electron microscope), and EDS analyses were employed to analyze the results of the electrochemical corrosion process. The electrochemical corrosion experiments showed that the open circuit potential of EH47 decreases and then increases with an increase in total immersion time, with the minimum value obtained at 28 days. With an increase in immersion time, the corrosion current density (Icorr) of EH47 steel first decreases and then increases, with the minimum at about 28 days. This 28-day sample also showed the maximum capacitance arc radius, the maximum impedance and the minimum corrosion rate. In the seawater immersion test in the laboratory, the corrosion mechanism of EH47 steel in the initial stage of corrosion is mainly pitting corrosion, accompanied by a small amount of crevice corrosion with increased corrosion time. The corrosion products of EH47 steel after immersion in seawater for 30 days are mainly composed of FeOOH, Fe3O4 and Fe2O3.

Comparison On The Immersion Corrosion and Electrochemical Performance of WC-Al2O3 Composites and WC-Co Hard Metal in NaCl Solution

2021 ◽  
Author(s):  
Bin Han ◽  
Weiwei Dong ◽  
Bowen Fan ◽  
Shigen Zhu
Keyword(s):  
Hard Alloy ◽  
Galvanic Corrosion ◽  
Hard Metal ◽  
Electrochemical Technique ◽  
Corrosion Mechanism ◽  
Nacl Solution ◽  
Passivation Film ◽  
Immersion Corrosion ◽  
Corrosion Behaviors ◽  
Hot Pressing Sintering

Abstract WC-15wt.%Al2O3 composites was prepared via hot pressing sintering technology. The corrosion behaviors of WC-Al2O3 composites and traditional WC-Co hard alloy in NaCl solution were studied by immersion corrosion and electrochemical technique. The impedance value of WC-Al2O3 composite increased more rapidly than WC-Co hard metal during the 24 hours, which indicated that WC-Al2O3 composites has more compact passivation film than WC-Co hard metal. The results confirmed that the corrosion performance of WC-Al2O3 composites was higher than WC-Co cemented carbide in NaCl solution. The corrosion mechanism of WC-Al2O3 composites and WC-Co hard alloy in NaCl solution were also revealed by SEM, EDS, XPS and Raman. The corrosion products of WC-Al2O3 composites mainly contain WO3, while for WC-Co hard alloy are Co (OH)2, Co3O4 and WO3. The different corrosion mechanism of the two materials is attributed to the Al2O3 phase instead of the Co binder, which avoids the galvanic corrosion between WC phase and Co binder.

Effect of Sealing Treatments on the Corrosion Behavior of Micro-arc Oxidation Coating on Aluminum Alloy in Acid NaCl Solution

2015 ◽  
Vol 30 (6) ◽  
pp. 627
Author(s):  
YE Zuo-Yan ◽  
LIU Dao-Xin ◽  
LI Chong-Yang ◽  
ZHANG Xiao-Hua ◽  
ZANG Xiao-Ming ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Corrosion Behavior ◽  
Nacl Solution ◽  
Micro Arc Oxidation
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