Anodization of Magnesium Alloys Using Phosphate Solution

Corrosion protection by anodization and conversion treatment in phosphate solution was studied by microstructural and electrochemical analysis. Both the anodized and the conversion-treated layers showed sacrificial protection in a solution of sodium chloride. The corrosion current or the dissolving rate of the anodized layer was smaller than that of the conversion-treated surface. The modified layers had another mode of protection to form protective films on magnesium substrate where the original modified layers were mechanically lost. Since the state of magnesium in the anodized layer is close to magnesium oxide, phosphorus in the layer is considered to have an important role in these properties concerning the above corrosion protection.

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Mechanical Properties and Microstructure of AZ Magnesium Alloys Anodized by Phosphate Electrolyte

Materials Science Forum ◽

10.4028/www.scientific.net/msf.654-656.771 ◽

2010 ◽

Vol 654-656 ◽

pp. 771-774

Author(s):

Teruto Kanadani ◽

Shuji Hikino ◽

Atsushi Saijo ◽

Makoto Hino ◽

Koji Murakami ◽

...

Keyword(s):

Mechanical Properties ◽

Magnesium Alloys ◽

Fatigue Cracks ◽

Tensile Tests ◽

Fatigue Tests ◽

Phosphate Solution ◽

Hardness Tests ◽

Die Cast ◽

Structural Applications ◽

Good Creep Resistance

Magnesium alloys possess many advantageous functional properties. Use of magnesium alloys, mainly for vehicle parts as well as electronic appliances, has been booming in recent years because of their lightweight compared to aluminum alloys and good creep resistance relative to plastics. Most the use of magnesium for structural applications has been die-cast components and most of this in one alloy, AZ91D. Since magnesium has the lowest electrochemical potential out of all the common commercial metals and is extremely prone to corrosion, it is necessary that it undergoes surface treatment. It is well known that fatigue cracks start near the free surface. Surface microstructure, therefore, should have a significant effect on the fatigue strength. This study was carried out using a mainly phosphate solution without heavy metal onto various AZ magnesium alloys. The effect of anodizing on mechanical properties and microstructure was examined by repeated tension fatigue tests, tensile tests, hardness tests and electron microscopy.

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1502 Corrosion protection and mechanical properties of AZX magnesium alloys anodized by phosphate solution

The Proceedings of Conference of Chugoku-Shikoku Branch ◽

10.1299/jsmecs.2011.49.447 ◽

2011 ◽

Vol 2011.49 (0) ◽

pp. 447-448

Author(s):

Atsushi Saitou ◽

Atsushi Saijo ◽

Teruto Kanadani ◽

Koji Murakami ◽

Makoto Hino

Keyword(s):

Mechanical Properties ◽

Magnesium Alloys ◽

Corrosion Protection ◽

Phosphate Solution

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Conversion-coating treatment for magnesium alloys by a permanganate–phosphate solution

Materials Chemistry and Physics ◽

10.1016/s0254-0584(02)00481-9 ◽

2003 ◽

Vol 80 (1) ◽

pp. 191-200 ◽

Cited By ~ 194

Author(s):

Kwo Zong Chong ◽

Teng Shih Shih

Keyword(s):

Magnesium Alloys ◽

Conversion Coating ◽

Phosphate Solution

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Determination of rare earth metals in magnesium alloys by atomic emission spectrometry with inductively coupled plasma

Izmeritel`naya Tekhnika ◽

10.32446/0368-1025it.2019-4-62-66 ◽

2019 ◽

pp. 62-66

Author(s):

R. M. Dvoretskov ◽

V. B. Baranovskaya ◽

F. N. Karachevtsev ◽

A. F. Letov

Keyword(s):

Rare Earth ◽

Magnesium Alloys ◽

Inductively Coupled Plasma ◽

Rare Earth Metals ◽

Atomic Emission ◽

Atomic Emission Spectrometry ◽

Emission Spectrometry ◽

Inductively Coupled

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Microstructural and Mechanical Behaviour Evaluation of Mg-Al-Zn Alloy Friction Stir Welded Joint

International Journal of Automotive and Mechanical Engineering ◽

10.15282/ijame.17.3.2020.08.0612 ◽

2020 ◽

Vol 17 (3) ◽

pp. 8150-8159

Author(s):

Kulwant Singh ◽

Gurbhinder Singh ◽

Harmeet Singh

Keyword(s):

Heat Treatment ◽

Friction Stir Welding ◽

Magnesium Alloys ◽

Mechanical Performance ◽

Fuel Efficiency ◽

Research Work ◽

Grain Structure ◽

Tensile Fracture ◽

Friction Stir ◽

The Impact

The weight reduction concept is most effective to reduce the emissions of greenhouse gases from vehicles, which also improves fuel efficiency. Amongst lightweight materials, magnesium alloys are attractive to the automotive sector as a structural material. Welding feasibility of magnesium alloys acts as an influential role in its usage for lightweight prospects. Friction stir welding (FSW) is an appropriate technique as compared to other welding techniques to join magnesium alloys. Field of friction stir welding is emerging in the current scenario. The friction stir welding technique has been selected to weld AZ91 magnesium alloys in the current research work. The microstructure and mechanical characteristics of the produced FSW butt joints have been investigated. Further, the influence of post welding heat treatment (at 260 °C for 1 h) on these properties has also been examined. Post welding heat treatment (PWHT) resulted in the improvement of the grain structure of weld zones which affected the mechanical performance of the joints. After heat treatment, the tensile strength and elongation of the joint increased by 12.6 % and 31.9 % respectively. It is proven that after PWHT, the microhardness of the stir zone reduced and a comparatively smoothened microhardness profile of the FSW joint obtained. No considerable variation in the location of the tensile fracture was witnessed after PWHT. The results show that the impact toughness of the weld joints further decreases after post welding heat treatment.

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