Effect of Zn content on corrosion resistance of as-cast Al-6Si-3Cu alloy

2022 ◽  
pp. 131658
Author(s):  
Rui Wang ◽  
Dongtao Wang ◽  
Hiromi Nagaumi ◽  
Zibin Wu ◽  
Xiaozu Zhang ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Zn Content

Influences of Zinc Content and Solution Heat Treatment on Microstructure and Corrosion Behavior of Mg-Zn Binary Alloys

CORROSION ◽  
10.5006/3672 ◽  
2020 ◽  
Author(s):  
Dinh Pham ◽  
Sachiko Hiromoto ◽  
Equo Kobayashi
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Corrosion Rate ◽  
Corrosion Behavior ◽  
Volume Fraction ◽  
Galvanic Corrosion ◽  
Zinc Content ◽  
Eutectic Cell ◽  
Zn Content ◽  
Cast Alloys

The influences of Zn content and heat treatment on microstructure and corrosion behavior of Mg-xZn (x=1, 3, 5 and 7 wt.%) alloys were studied. (α-Mg + MgZn) eutectic cells and Zn-segregated regions were formed in the as-cast alloys. The Zn-rich phases acted as micro-cathodes in galvanic corrosion. Volume fraction of the Zn-rich phases increased with Zn content of the as-cast alloys, leading to a decrease in corrosion resistance. The corrosion rate of the as-cast alloys increased by 4 times with an increase of the volume fraction of eutectic cell from 0.07 vol.% of Mg-1Zn alloy to 2.18 vol.% of Mg-5Zn alloy. The corrosion rate of Mg-7Zn alloy with 2.87 vol% eutectic cells was 2 times higher than that of Mg-5Zn alloy. The Zn-rich phases dissolved by the T4 treatment and only the T4-treated Mg-7Zn alloy obviously showed eutectic cells of 1.73 vol.%. The polarization resistance (Rp) of the T4-treated Mg-1, 3 and 5Zn alloys was 2-10 times higher than that of the as-cast alloys. The T4-treated Mg-7Zn showed similar Rp to the as-cast Mg-5Zn alloy. Consequently, the volume fraction of Zn-rich phases dominated the corrosion resistance of Mg-xZn alloys.

scholarly journals Effect of Zn Content on Orthopedic Mg aAlloy as Smart Implant

2020 ◽  
Vol 71 (6) ◽  
pp. 96-110
Author(s):  
Omyma Ramadan Mohammed Khalifa ◽  
Abdel-Wahab Abd Elhamid Ali ◽  
Aisha Kassab ◽  
Amal Hemida Tilp ◽  
Marwa Mohamed Mohamed Mohamed Esmail
Keyword(s):  
Corrosion Resistance ◽  
Simulated Body Fluid ◽  
Body Fluid ◽  
Biomedical Applications ◽  
Orthopedic Implants ◽  
X Ray Diffraction ◽  
Electro Deposition ◽  
X Ray ◽  
Zn Content ◽  
The Media

In recent years, smart implants take the most attention in the field of bone manufacturing. Our study seeks to develop the biodegradability of Mg alloys to use orthopedic implants for the biomedical applications to avoid post removal of the implant. Mg and Zn are very important to human body and have no toxicity. Mg - 6% wt Zn biodegradability is studied in simulated body fluid for two and four weeks. Four electro-deposition bathes are used to deposit a coat on the substrate to improve the corrosion resistance of this alloy in the media of simulated body fluid. The following analyses were studied to emphasize the research aim. Scanning electron microscope (SEM), Energy dispersive X-Ray (EDX) analysis shows the surface morphology and the elements of the coat phases components. The results also confirmed by X-Ray diffraction Pattern (XRD) that show the phases that confirmed the formation of hydroxyapatite HA phase, Fourier-Transform Infrared Spectroscopy (FTIR) to investigate the functional groups of the phases coats that confirm the formation of hydroxyapatite and the electrochemical measurements that investigate the improvement of corrosion resistance. The results indicated that the fourth bath gives the best coat and four weeks immersion gives more corrosion resistance than two weeks.

Effects of Zn content on surface deformability and corrosion resistance of MgZnMnCa alloys

2020 ◽  
Vol 111 (6) ◽  
pp. 511-518
Author(s):  
Márcio Teodoro Fernandes ◽  
Leonardo Martins da Silva ◽  
Bruno Xavier de Freitas ◽  
Gláucia Domingues ◽  
José Adilson de Castro ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Zn Content

Understanding the Compromise between Strength and Exfoliation Corrosion in High Strength 7000 Alloys

2006 ◽  
Vol 519-521 ◽  
pp. 455-460 ◽  
Author(s):  
T. Marlaud ◽  
B. Baroux ◽  
Alexis Deschamps ◽  
J.L. Chemin ◽  
C. Hénon
Keyword(s):  
Corrosion Resistance ◽  
Volume Fraction ◽  
High Strength ◽  
Precipitate Size ◽  
Scanning Calorimetry ◽  
X Ray Scattering ◽  
Transmission Electron ◽  
Size Evolution ◽  
Zn Content ◽  
Zn Alloy

The microstructural evolution has been investigated in three alloys of the 7000 series possessing increasing zinc contents by combining small-angle X-ray scattering, differential scanning calorimetry and transmission electron microscopy, in order to gain understanding on the evolution of the compromise between yield strength and corrosion resistance. We show that the three materials show qualitatively identical precipitation sequences; however the precipitated volume fraction is shown to increase in parallel to the Zn content. Moreover, the precipitate size evolution is faster in the high Zn alloy. The precipitate composition is inferred to vary in the three materials, and this difference is shown to explain the differences in calorimetric behavior, precipitation kinetics and corrosion resistance.

Effects of Sb and Zn Addition on Mechanical Properties and Corrosion Resistance of Sn–Ag–Cu Solders

2017 ◽  
Vol 728 ◽  
pp. 129-134 ◽  
Author(s):  
Kittichai Fakpan ◽  
Rungsinee Canyook
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Corrosion Resistance ◽  
Potentiodynamic Polarization ◽  
Eutectic Phase ◽  
Melting Method ◽  
Zn Addition ◽  
Zn Content ◽  
Superior Mechanical Properties ◽  
Mechanical Properties And Corrosion

Pb–free solders have been widely developed by materials researchers as mainly focused on the replacement for Sn–Pb eutectic solder. In this study, Sn–3.0Ag–0.5Cu, Sn–3.0Ag–0.5Cu–xSb and Sn–3.0Ag–0.5Cu–xZn solders (x = 1.0, 2.0 and 3.0 wt%) were prepared using melting method. The effect of Sb and Zn addition on microstructure and properties, such as tensile strength, microhardness and corrosion resistance of Sn–Ag–Cu solders was investigated. The microstructure analysis revealed that addition of Sb and Zn to the Sn–Ag–Cu solders obviously decreased phase fraction of the dendritic β–Sn phase and the finer eutectic phase was obtained, resulting in superior mechanical properties of the Sn–3.0Ag–0.5Cu–xSb and Sn–3.0Ag–0.5Cu–xZn solders compared to the Sn–3.0Ag–0.5Cu solder. The results of potentiodynamic polarization tests indicated that the corrosion potentials of the Sn–3.0Ag–0.5Cu–xSb solders continuously increased with increasing of Sb content. While Zn content had little effect on the corrosion potentials of the Sn–3.0Ag–0.5Cu–xZn solders.

Factors Affecting on the Corrosion Resistance of Electroless Ni-Zn-P Coated Steel

2017 ◽  
Vol 751 ◽  
pp. 125-130
Author(s):  
Pranee Rattanawaleedirojn ◽  
Kanokwan Saengkiettiyut ◽  
Yuttanant Boonyongmaneerat ◽  
Jumpot Wanichsampan
Keyword(s):  
Corrosion Resistance ◽  
High Hardness ◽  
Zinc Ion ◽  
Ion Concentration ◽  
Complexing Agent ◽  
Nickel Ion ◽  
Zn Content ◽  
Protection Property ◽  
Electroless Ni ◽  
Sacrificial Protection

Electroless Ni-Zn-P coating with the optimal content of Ni and Zn in the alloy provides high corrosion resistance for steel. Ni-rich phase of this high hardness Ni-Zn-P alloy offers barrier protection property and sacrificial protection property is obtained from the alloy with proper content of Zn. In this work, the Ni-Zn-P coatings were prepared on steel substrates by using alkaline electroless deposition. The parameters of deposition process including complexing agent concentration, bath pH, zinc ion and nickel ion concentration were systematically studied. The microstructural morphology and elemental composition of the coatings were characterized by scanning electron microscopy. It was found that complexing agent, zinc ion and nickel ion concentrations play important role on Zn content of Ni-Zn-P alloy whereas alkalinity of the solution bath directly affects the deposition rate. The results of corrosion resistance investigated by linear polarization illustrate that the corrosion potential (Ecorr) of Ni-Zn-P coatings is negatively shifted by an increase of Zn content in the alloys. From this work, Ecorr of 83%Ni-11%Zn-6%P coating prepared in this system is slightly lower than steel. To achieve a higher effect of sacrificial protection for corrosion protection of steel, Ni-Zn-P with higher content of Zn should be further studied.

Study on Zn-Mn Alloy Plating on the Surface of Steel Sheet Prepared in Hydrochloric Acid Bath

2020 ◽  
Vol 843 ◽  
pp. 147-152
Author(s):  
Soo Young Kang
Keyword(s):  
Corrosion Resistance ◽  
Steel Corrosion ◽  
Pure Zinc ◽  
Zinc Plating ◽  
Acid Bath ◽  
Zn Content ◽  
Automotive Parts ◽  
Acidic Chloride ◽  
Mn Content ◽  
Alloy Plating

Zinc plating using the principle of sacrificial anode is used to prevent steel corrosion. Pure zinc plating has some problems and Zn-Mn alloy plating has been studied as one of the measures to increase the corrosion resistance. Zn-Mn alloy plating can be applied to automotive parts requiring high corrosion resistance despite high plating cost. In this study, Zn-Mn alloy plating was electrodeposited in acidic chloride solution. The effects of electrolytic conditions on the composition of the alloy plating in the chloride bath were investigated. As the current density increased, the Zn content decreased and the Mn content increased. As the temperature of the electrolyte increased, the Zn content decreased and the Mn content increased.

Mechanical and Electrochemical Properties of Plasma Electrolytic Oxide Coatings on Magnesium Alloys

2007 ◽  
Vol 539-543 ◽  
pp. 1224-1229 ◽  
Author(s):  
Si Young Chang ◽  
Ye Lim Kim ◽  
Byung Heum Song ◽  
Jae Ho Lee
Keyword(s):  
Corrosion Resistance ◽  
Electrochemical Properties ◽  
Ceramic Coatings ◽  
Oxide Coatings ◽  
Al Content ◽  
Zn Content ◽  
Electrolytic Oxidation ◽  
Porous Microstructure ◽  
Plasma Electrolytic ◽  
Zn Alloys

Ceramic coatings were synthesized on pure magnesium, binary Mg-Al and Mg-Zn alloys by plasma electrolytic oxidation (PEO) technique, and their mechanical and electrochemical properties were investigated. The coatings showed porous microstructure and some volcano top-like pores on the surface. The coatings on Mg-Al alloys consisted of MgO, MgAl2O4 and Al2O3. In the coatings on Mg-Zn alloys, MgO and ZnO were detected. The hardness and wear resistance showed slight dependence on Al content but no tendency to increase with increasing Zn content. The coated Mg alloys with Al, Zn showed better corrosion resistance in 3.5%NaCl solution but poor corrosion resistance in methyl alcohol, compared to the coated pure Mg.

Microstructures of Ti-1.5 w/o Ni Alloys with Mo and A1 Additions

1975 ◽  
Vol 33 ◽  
pp. 54-55
Author(s):  
Anna C. Fraker
Keyword(s):  
Corrosion Resistance ◽  
Beneficial Effect ◽  
Crevice Corrosion ◽  
Local Corrosion ◽  
Precipitate Size ◽  
Ni Alloys

Small amounts of nickel are added to titanium to improve the crevice corrosion resistance but this results in an alloy which has sheet fabrication difficulties and is subject to the formation of large Ti2Ni precipitates. These large precipitates can serve as local corrosion sites; but in a smaller more widely dispersed form, they can have a beneficial effect on crevice corrosion resistance. The purpose of the present work is to show that the addition of a small amount of Mo to the Ti-1.5Ni alloy reduces the Ti2Ni precipitate size and produces a more elongated grained microstructure. It has recently been reported that small additions of Mo to Ti-0.8 to lw/o Ni alloys produce good crevice corrosion resistance and improved fabrication properties.

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