Study of Aluminum Coating Thermally Sprayed on AZ80 Magnesium Alloy Surface

2011 ◽  
Vol 686 ◽  
pp. 319-324
Author(s):  
Hong Yan Xu ◽  
Sen Chang ◽  
Xing Zhang ◽  
Zhi Min Zhang
Keyword(s):  
Corrosion Rate ◽  
Adhesion Strength ◽  
Mg Alloys ◽  
Mg Alloy ◽  
Nacl Solution ◽  
Deformation Degree ◽  
Corrosion Properties ◽  
Az80 Magnesium Alloy ◽  
Al Coating ◽  
Thermally Sprayed

Aluminum (Al) coating was thermally sprayed on the surface of AZ80 magnesium (Mg) alloy. The Al-coating was deformed at 400°C with different deformation degrees of 15%, 30%, 45%, 60% and 80%. The corrosion properties of the AZ80 Mg alloys coated with Al-coatings were studied by potentiodynamic and galvanic tests in 3.5% NaCl solution; the adhesion strengths between Al-coatings and AZ80 substrate were also measured simultaneously by tensile test. The results showed that, Al-coating could decrease the corrosion rate of AZ80 Mg alloys, and the corrosion rate was related not only with the density of Al-coating but also with the adhesion strength of Al-coating. Before the formation of dense Al-coating, the corrosion rate of Al-coated AZ80 Mg alloys decreased with the increasing of bonding strength of Al-coating; after the formation of dense Al-coating, the corrosion rate of Al-coated AZ80 Mg was mainly determined by the structure of Al-coating. It was also revealed that with the increasing of deformation degree, the corrosion rate of the Al-coated AZ80 Mg alloys first decreased then increased, while the adhesion strength increased gradually. The corrosion rate of AZ80 Mg alloy coated with 60% deformed Al-coating was the lowest, which was only 19% of that of the AZ80 substrate.

Corrosion Resistance of Mg Alloy with High Zn Concentration Including Impurity Cu

2021 ◽  
Vol 1016 ◽  
pp. 592-597
Author(s):  
Masato Ikoma ◽  
Taiki Morishige ◽  
Tetsuo Kikuchi ◽  
Ryuichi Yoshida ◽  
Toshihide Takenaka
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Rate ◽  
Mg Alloys ◽  
Mg Alloy ◽  
Second Phase ◽  
Transportation Industry ◽  
Primary Metal ◽  
Cu Content ◽  
Zn Concentration ◽  
Lower Corrosion Rate

Mg alloys are very attractive materials for transportation industry due to their toughness and lightness. Recycling Mg alloys is desired for energy saving that otherwise would be required to produce its primary metal. However, secondary produced Mg tends to contain a few impurity elements that deteriorate its corrosion resistance. For example, contamination of Mg alloy by Cu induces second phase of Mg2Cu and it works as strong cathode, resulting in the corrosion rate rapidly increasing. It was previously reported that the corrosion resistance of Mg with impurity Cu was remarkably improved by addition of alloying element Zn. Addition of Zn into Mg formed MgZn2 phase and incorporated Cu into MgZn2 phase instead of Mg2Cu formation. In this way, since Zn serves to improve the corrosion resistance of Mg, Mg alloy with high Zn concentration may form a lot of MgZn2 and may have better corrosion resistance even with high Cu concentration. In this work, the corrosion behavior of Mg-6mass%-1mass%Al (ZA61) with different Cu content up to 1mass% was investigated. As a result, ZA61-1.0Cu had much lower corrosion rate compared to Mg-0.2%Cu and the corrosion rate was almost the same as that of pure Mg.

Effect of heat treatment on microstructure and corrosion resistance of extruded ZK80 Mg alloy

2019 ◽  
Vol 9 (9) ◽  
pp. 1092-1099
Author(s):  
Fenghong Cao ◽  
Chang Chen ◽  
Zhenyu Wang
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Corrosion Rate ◽  
Aging Time ◽  
Room Temperature ◽  
Aging Treatment ◽  
Corrosion Process ◽  
Corrosion Mechanism ◽  
Nacl Solution ◽  
Corrosion Properties

The corrosion characteristics and corrosion mechanism of the extruded ZK80 alloy with different states soaking in 3.5% NaCl solution at room temperature were analyzed via OM, SEM, EDS, XRD and static weightlessness method and other experimental analysis methods. The results show that when the aging temperature is constant, and the corrosion rate decreases with the lengthen of aging time, while when the corrosion time is constant, the corrosion rate increases with the increase in aging time. Appropriate aging treatment not only refines the grain of the alloy, but also precipitates the Mg–Zn phase which can effectively prevent the corrosion process and improve the anti-corrosion properties of the alloy. The main corrosion characteristics of the alloy are filamentary corrosion and pitting corrosion.

scholarly journals Effect of Surface Nanocrystallization on Corrosion Resistance of the Conformed Cu-0.4%Mg Alloy in NaCl Solution

Metals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 765 ◽  
Author(s):  
Dan Song ◽  
Jinghua Jiang ◽  
Xiaonan Guan ◽  
Yanxin Qiao ◽  
Xuebin Li ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Rate ◽  
High Speed ◽  
Mg Alloy ◽  
Nacl Solution ◽  
Immersion Corrosion ◽  
Initial Stage ◽  
Wire Brushing ◽  
Dislocation Cells ◽  
Effect Of Surface

Surface nano-crystallization (SNC) of a conform-extruded Cu-0.4 wt.% Mg alloy was successfully conducted by high-speed rotating wire-brushing to obtain the deformed zone with dislocation cells and nanocrystallines. SNC promotes the anodic dissolution and corrosion rate of the Cu-Mg alloy in the initial stage of immersion corrosion in 0.1 M NaCl solution. The weakened corrosion resistance is mainly attributed to the higher corrosion activity of SNC-treated alloy. With extending the immersion time, the SNC-treated alloy slows the corrosion rate dramatically and exhibits uniform dissolution of the surface. The formation of the dense corrosion products leads to the improvement of overall corrosion performance. It indicates that the SNC-treated Cu-Mg alloy can function reliably for a longer duration in a corrosive environment.

scholarly journals Effect of Heat Treatment on the Mechanical and Corrosion Properties of Mg–Zn–Ga Biodegradable Mg Alloys

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7847
Author(s):  
Viacheslav Bazhenov ◽  
Anastasia Lyskovich ◽  
Anna Li ◽  
Vasily Bautin ◽  
Alexander Komissarov ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Corrosion Rate ◽  
Orthopedic Implants ◽  
Mg Alloys ◽  
Medical Implants ◽  
Corrosion Properties ◽  
Treatment Regimens ◽  
Mechanical And Corrosion Properties ◽  
Potential Use

Mg alloys have mechanical properties similar to those of human bones, and have been studied extensively because of their potential use in biodegradable medical implants. In this study, the influence of different heat treatment regimens on the microstructure and mechanical and corrosion properties of biodegradable Mg–Zn–Ga alloys was investigated, because Ga is effective in the treatment of disorders associated with accelerated bone loss. Solid–solution heat treatment (SSHT) enhanced the mechanical properties of these alloys, and a low corrosion rate in Hanks’ solution was achieved because of the decrease in the cathodic-phase content after SSHT. Thus, the Mg–4 wt.% Zn–4 wt.% Ga–0.5 wt.% Y alloy after 18 h of SSHT at 350 °C (ultimate tensile strength: 207 MPa; yield strength: 97 MPa; elongation at fracture: 7.5%; corrosion rate: 0.27 mm/year) was recommended for low-loaded orthopedic implants.

scholarly journals Ca and Ce Effect on the Corrosion Resistance of Hot-Rolled AZ31 Mg Alloys

2020 ◽  
Vol 10 (1) ◽  
pp. 5113-5116
Author(s):  
I. H. Kara ◽  
T. A. I. Yousef ◽  
H. Ahlatci ◽  
Y. Turen
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Test ◽  
Die Casting ◽  
Immersion Test ◽  
Mg Alloys ◽  
Nacl Solution ◽  
Corrosion Properties ◽  
Low Pressure Die Casting ◽  
Hot Rolled ◽  
Pressure Die Casting

In this study, AZ31 Mg alloys with added Ca and Ce were produced by low pressure die casting and were rolled at 400°C. The corrosion properties of the materials were determined by immersion test for 72 hours at a 3.5% NaCl solution. The microstructure of the samples was investigated by light optical microscopy (LOM) and scanning electron microscopy (SEM) before the corrosion test. Twins, dynamic recrystallization (DRX), and the alloying elements have an important role in imparting the final corrosion resistance of the investigated materials.

Nanocomposite TiAlBN Coatings as a Corrosion Protection Layer for AZ91 Mg Alloy Substrate in NaCl

2015 ◽  
Vol 819 ◽  
pp. 109-114 ◽  
Author(s):  
M.R. Zulkifli ◽  
Muhammad Zaimi ◽  
Jariah Mohamad Juoi ◽  
Zainab Mahamud
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Protection ◽  
Mass Loss Rate ◽  
Mg Alloy ◽  
Hard Coating ◽  
Nacl Solution ◽  
Corrosion Properties ◽  
Alloy Substrate ◽  
Structural Application ◽  
Tin Coatings

Magnesium alloys create increasing interest in structural application where weight reduction is vast concern. However, one of magnesium drawback in various applications is low corrosion resistance. In general, a hard coating can be applied on metal to combat such a problem. AlN and TiN coatings are most widely utilized in manufacturing area i.e for structural application due to its high hardness, high chemical stability, and excellent adhesion to substrates. Most recent, TiAlBN coating catch many attentions due to its superior properties than other most studied hard coating. The incorporation of aluminium in the cubic face centered TiN structure on Ti sites leads to deformation and strengthening of the crystal structure of the coating together. Moreover, incorporation of BN in this coating should improve and enhanced the corrosion resistance of Mg alloy. Therefore, in this study, TiAlBN coating have been chosen to be deposited on Mg alloy using reactive magnetron sputtering together with AlN and TiN coatings for comparison study. During depositions, target power, working pressure and bias voltage are optimized for each coating. Analysis on the effect of AlN, TiN and TiAlBN coatings on Mg alloy substrate include thickness measurement and microstructure by scanning electron microscope (SEM). Coatings phase were analysed using glancing angle X-ray diffraction analysis (GAXRD) and corrosion properties were evaluated using potentiodynamic polarization in NaCl solution. TiAlBN shows better performance of corrosion protection with the least corrosion rate (penetration rate = 0.20 mm/yr; mass loss rate=0.97g/m2d) in sodium chloride (NaCl) solution although having the lowest coating thickness (412 nm).

Relationship between Heat Treatments and Corrosion of Al-Si-Mg Casting Alloy

2014 ◽  
Vol 900 ◽  
pp. 96-99 ◽  
Author(s):  
Ping Chen ◽  
Li Hua Liang ◽  
Gong Luo ◽  
Jian Min Zeng
Keyword(s):  
Solution Treatment ◽  
Heat Treatments ◽  
Mg Alloy ◽  
Casting Alloy ◽  
Nacl Solution ◽  
Corrosion Properties ◽  
Immersion Corrosion ◽  
Peak Aging ◽  
Mechanical Properties And Corrosion ◽  
Scanning Electron

The casting Al-Si-Mg alloy can be strengthened by heat treatments. There are close relations between heat treatments and alloys mechanical properties and corrosion resistance. The effects of heat treatments condition on corrosion behavior of Al-Si-Mg alloy in NaCl solution were studied by electrochemistry tests and immersion corrosion tests in this paper. The morphology of alloys after immersion corrosion was observed by OM (optical microscopy) and SEM (scanning electron microscopy). The influences of heat treatments on the corrosion of casting Al-Si-Mg alloy were explained. Different microstructures could lead to variation of corrosion properties. The corrosion properties of Al-Si-Mg alloy after casting, ST (solution treatment) and different aging respectively were analyzed. The results show that corrosion properties under PA (peak aging) are the worst and the best ones with ST, at the same time the Icorr under PA are the highest case and the lowest ones with ST.

scholarly journals The Effect of Sn Addition on Zn-Al-Mg Alloy; Part II: Corrosion Behaviour

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5290
Author(s):  
Zuzana Gabalcová ◽  
Peter Gogola ◽  
Martin Kusý ◽  
Henrich Suchánek
Keyword(s):  
Intergranular Corrosion ◽  
Corrosion Behaviour ◽  
Salt Spray ◽  
Xrd Analysis ◽  
Corrosion Products ◽  
Mg Alloys ◽  
Mg Alloy ◽  
Corrosion Properties ◽  
Alloy Part ◽  
Salt Spray Testing

Corrosion behaviour of Sn (0.0, 0.5, 1.0, 2.0 and 3.0 wt.%)-doped Zn 1.6 wt.% Al 1.6 wt.% Mg alloys exposed to salt spray testing was investigated. Intergranular corrosion was observed for all alloys in both as-cast and annealed states. However, due to microstructure spheroidisation in the annealed samples, potential intergranular corrosion paths are significantly reduced. Samples with 0.5 wt.% of Sn showed the best corrosion properties. The main corrosion products identified by XRD analysis for all samples were simonkolleite and hydrozincite. Occasionally, ZnO and AlO were identified in limited amounts.

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