Influence of Electrodeposition Time on Corrosion Performance of Tinplate in NaCl Solution

2021 ◽  
pp. ArticleID:210650
Author(s):  
Lianfeng Shen ◽  
Keyword(s):  
Nacl Solution ◽  
Corrosion Performance ◽  
Electrodeposition Time

scholarly journals Microstructure and Corrosion Properties of La2Zr2O7/NiCoAlY Thermal Barrier Coatings Deposited on Inconel 718 Superalloy by Laser Cladding

Coatings ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 101
Author(s):  
Kaijin Huang ◽  
Wei Li ◽  
Kai Pan ◽  
Xin Lin ◽  
Aihua Wang
Keyword(s):  
Corrosion Resistance ◽  
Thermal Barrier Coating ◽  
Laser Cladding ◽  
Inconel 718 ◽  
Electrochemical Techniques ◽  
Thermal Barrier ◽  
Nacl Solution ◽  
Corrosion Performance ◽  
Barrier Coating ◽  
Inconel 718 Superalloy

In order to improve the seawater corrosion resistance of Inconel 718 superalloy, a La2Zr2O7/NiCoCrAlY thermal barrier coating corrosion resistant to 3.5 wt.% NaCl aqueous solution was prepared by laser cladding on Inconel 718 superalloy. X-ray diffraction (XRD), Scanning Electron Microscope (SEM), and electrochemical techniques were used to study the microstructure and the corrosion performance of the coating in 3.5 wt.% NaCl solution. The results show that the thermal barrier coating is mainly composed of primary La2Zr2O7 phase and γ + laves/δ phase eutectic structure. The corrosion potential and corrosion current of the coating in 3.5 wt.% NaCl solution are higher and lower than that of the Inconel 718 substrate, respectively, indicating that the corrosion performance of the coating is better than that of the Inconel 718 substrate. The presence of La2Zr2O7 phase in the thermal barrier coating is the main reason for its corrosion resistance to 3.5 wt.% NaCl solution.

Effect of Cr and Zr Addition on the Corrosion Behaviour of Copper in the Chloride Solution

2011 ◽  
Vol 194-196 ◽  
pp. 1253-1256
Author(s):  
Ya Ni Zhang ◽  
Mao Sheng Zheng ◽  
Jie Wu Zhu
Keyword(s):  
Corrosion Resistance ◽  
Chloride Solution ◽  
Corrosion Behaviour ◽  
Pure Copper ◽  
Base Material ◽  
Nacl Solution ◽  
Corrosion Performance ◽  
Zr Addition ◽  
Corrosion Scales ◽  
Better Than

The corrosion behavior of CuCr, CuZr and CuCrZr alloys in NaCl solution is reported in this paper. The corrosion performance has been evaluated in NaCl solution atmosphere. The results show the corrosion resistance of pure copper decrease with the addition of the alloying elements initially. However, in the later exposure stages, the corrosion resistance of CuZr and CuCrZr alloy deteriorates significantly while the corrosion resistance of CuCr alloy is slightly better than that of pure copper. In addition, the results of the electrochemical experiments indicate that the different behavior for the element Cr and Zr in the base material and corrosion scales lead to the change of the corrosion resistance.

Corrosion Resistance of Nd-Fe-B Magnets Coated with Polypyrrole Films

2006 ◽  
Vol 530-531 ◽  
pp. 111-116
Author(s):  
M.C.E. Bandeira ◽  
F.D. Prochnow ◽  
Isolda Costa ◽  
César V. Franco
Keyword(s):  
Corrosion Resistance ◽  
Electrochemical Impedance ◽  
Nacl Solution ◽  
Corrosion Performance ◽  
Low Frequencies ◽  
Polypyrrole Films ◽  
Phosphate Ions ◽  
Polypyrrole Film ◽  
Corrosive Environments ◽  
Magnet Surface

Nd-Fe-B magnets present outstanding magnetic properties. However, due to their low corrosion resistance, their applications are limited to non-corrosive environments. Nowadays, significant efforts are underway to increase the corrosion resistance of these materials, through the use of coatings. Herein are presented the results of a study on the corrosion resistance of Nd-Fe-B magnets coated with polypyrrole (PPY). The electrochemical behavior of coated and uncoated magnets has been studied by Electrochemical Impedance spectroscopy (EIS) in synthetic saliva. The results were compared to previous investigations, which were carried out under similar conditions, in Na2SO4 and NaCl solutions. In sulphate solution, the corrosion resistance of the PPY-coated magnet was 3 times larger (1600 .cm2) than that of uncoated magnet (500 .cm2). In NaCl solution, however, the corrosion resistance of coated and uncoated magnets were very similar (250 .cm2). In synthetic saliva, both the uncoated and coated magnets presented good corrosion performance (1940 .cm2). Such behavior can be attributed to the phosphate ions in saliva, which play a role as corrosion inhibitor, producing phosphating, at least partially, of the magnet surface. The PPY-coated magnets presented a strong diffusional control from moderate to low frequencies, caused by the polypyrrole film. The thicker PPY film increased the corrosion resistance of the magnet in synthetic saliva.

Corrosion Protection Coatings from Size-Specified Graphene Oxide

2020 ◽  
Vol 981 ◽  
pp. 29-33
Author(s):  
Nurul Huda Abu Bakar ◽  
Jamil Ismail ◽  
Kwok Feng Chong
Keyword(s):  
Graphene Oxide ◽  
Corrosion Protection ◽  
Surface Texture ◽  
Copper Substrate ◽  
Smooth Surfaces ◽  
Nacl Solution ◽  
Corrosion Performance

Corrosion performance of graphene oxide (GO) coatings from different sheets sizes in 3.5 wt% NaCl solution was investigated. The GO dispersion was subjected to 5 and 10 hours of ultrasonication before electrophoretically deposited (EPD) onto the copper substrate. It was found that the EPD-GO coating from smaller sheets (10h ultrasonication) possess hydrophobic, thinner film and smooth surfaces. It is suggested that the corrosion performance of the coating from smaller GO sheets is improved due to the surface texture and compactness of the coating as compared to the larger GO sheets.

Effect of Manganese on Discharge and Corrosion Performance of Magnesium Alloy AP65 as Anode for Seawater-Activated Battery

CORROSION ◽  
2012 ◽  
Vol 68 (5) ◽  
pp. 388-397 ◽  
Author(s):  
N.-G. Wang ◽  
R.-C. Wang ◽  
C.-Q. Peng ◽  
Y. Feng
Keyword(s):  
Magnesium Alloy ◽  
Mass Fraction ◽  
Electrochemical Measurement ◽  
The Self ◽  
Discharge Process ◽  
Nacl Solution ◽  
Corrosion Performance ◽  
Corrosion Morphology ◽  
Immersion Testing ◽  
Discharge Potential

Magnesium alloys AP65 with and without 0.3% (mass fraction) manganese additions were prepared by melting and casting. Their discharge and corrosion behavior in 3.5% sodium chloride (NaCl) solution was investigated with electrochemical measurement, immersion testing, and corrosion morphology observation. The results show that manganese promotes the grain refinement and reduces the self corrosion rate of AP65 alloy. Magnesium alloy AP65 added with manganese provides a more negative discharge potential than that without the addition of manganese, attributed to the homogeneously distributed Al11Mn4 particles, which facilitate the self-peeling of corrosion products during the discharge process. This means that the discharge and corrosion performance of AP65 alloy can be improved by adding manganese.

scholarly journals The Influence of Glass Flake and Micaceous Iron Oxide on Electrochemical Corrosion Performance of Waterborne Silicate Coatings in 3.5% NaCl Solution

Coatings ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 833 ◽  
Author(s):  
Xu Zhao ◽  
Yuhong Qi ◽  
Zhanping Zhang ◽  
Kejiao Li
Keyword(s):  
Electrochemical Impedance ◽  
Composite Coatings ◽  
Impact Resistance ◽  
Electrochemical Corrosion ◽  
Nacl Solution ◽  
Corrosion Performance ◽  
Pencil Hardness ◽  
Anticorrosive Pigments ◽  
Comprehensive Comparison ◽  
Glass Flake

Waterborne silicate composite coatings were prepared to replace existing solvent-based coatings for ships. A series of complex coatings were prepared by adding anticorrosive pigments to the silicate resin. Adhesion, pencil hardness, and impact resistance were investigated, and corrosion performance in 3.5% NaCl solution was measured by electrochemical impedance spectroscopy (EIS). The results show that adhesion and impact resistance are high, and that pencil hardness can reach 4H. The curing mechanism for the coatings were investigated by Fourier-transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The mechanism of curing reaction in the studied waterborne silicate paint was found to be different from that reported in the literature. When the coatings were immersed in 3.5% NaCl solution for 8 h, there is only one time constant in the Bode plot, and coating capacitance (Qc) gradually increases while coating resistance (Rc) gradually decreases. Glass flake composite coatings have better corrosion resistance by comprehensive comparison of Qc and Rc.

Microstructure and anti-corrosion performance of laser cladded Nb-modified Ni-based alloy coatings

2021 ◽  
pp. 146442072110612
Author(s):  
Haixiang Chen ◽  
Kun Wang
Keyword(s):  
Chemical Composition ◽  
Dendritic Growth ◽  
Nacl Solution ◽  
Corrosion Performance ◽  
Passive Stability ◽  
Immersion Corrosion ◽  
Refined Microstructure ◽  
Mass Fractions ◽  
Nb Content ◽  
Electrochemical Passivation

In this work, Ni-based alloy coatings incorporated with Nb mass fractions of 0%, 3%, 6%, and 9% were successfully fabricated by laser cladding. The morphology, chemical composition, and phases of the obtained Nb-modified Ni-based coatings were characterized, and the effects of Nb contents on their electrochemical performance and immersion rates in 3.5 wt% NaCl solution were analyzed. The results show that the Ni-based coating with low Nb exhibits the most compact and refined microstructure, the best electrochemical passivation, and the lowest immersion corrosion rate of 3.30 × 10−3 mm/year. However, with increasing Nb content, the Laves phase is accumulated, and dendritic growth is promoted, which significantly decreases the coating passive stability and worsens the anti-corrosion performance.

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