Study on Factors Affecting the Properties of Micro-arc Oxidation Film on Magnesium Alloys Based on Phosphate Electrolyte

Anodic coatings were prepared by micro arc oxidation on AZ91HP in a base solution of 18 g/L Na2SiO3 ּ9H2Oand 4 g/L tannic acid with 5-20 g/l NaOH. The influence of NaOH concentration on final voltage and corrosion resistance were studied. The morphologies of anodic coatings were determined by environmental scanning electron microscope (ESEM). Potentiodynamic polarization test was performed in 3.5wt.% NaCl solution to evaluate the corrosion resistance of anodic coatings. The results show that the NaOH concentration has greatly effect on the final voltage, the compositions, thickness, morphologies and corrosion resistance. The corrosion resistance of anodic coatings is the best in the base solution containing 10 g/l NaOH.

Download Full-text

Anodizing from phosphate electrolyte onto various AZ series magnesium alloys and corrosion resistance

Journal of Japan Institute of Light Metals ◽

10.2464/jilm.57.583 ◽

2007 ◽

Vol 57 (12) ◽

pp. 583-588 ◽

Cited By ~ 11

Author(s):

Makoto HINO ◽

Koji MURAKAMI ◽

Ken MURAOKA ◽

Atsushi SAIJO ◽

Teruto KANADANI

Keyword(s):

Corrosion Resistance ◽

Magnesium Alloys ◽

Phosphate Electrolyte

Download Full-text

Comparative study of micro-arc oxidation treatment for AM, AZ and MZ magnesium alloys

Protection of Metals and Physical Chemistry of Surfaces ◽

10.1134/s2070205115040292 ◽

2015 ◽

Vol 51 (4) ◽

pp. 620-629 ◽

Cited By ~ 7

Author(s):

H. Soliman ◽

Abdel Salam Hamdy

Keyword(s):

Comparative Study ◽

Magnesium Alloys ◽

Oxidation Treatment ◽

Micro Arc Oxidation

Download Full-text

Research on the Electrolyte Service Life of Treating AZ91D by Micro Arc Oxidation

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.464.1 ◽

2011 ◽

Vol 464 ◽

pp. 1-4

Author(s):

Ming Qiang Pan ◽

Shi Chun Di ◽

Tao Chen ◽

Li Guo Chen ◽

Zhen Hua Wang

Keyword(s):

Service Life ◽

Working Time ◽

Active State ◽

Critical Factors ◽

Factors Affecting ◽

Initial Voltage ◽

Micro Arc Oxidation ◽

Curve Extension ◽

Solution Volume

With the development of micro arc oxidation and the growing maturity of the industrialization, the electrolyte service life and stability attract more and more people. In this paper, the electrolyte service life was researched. Under the same technological conditions, it was found that the critical factors affecting the electrolyte service life are the single-processing area and the electrolyte volume. With prolonging the working time of the electrolyte, the gel deposition mass in the electrolyte and the initial voltage always change. The experiment indicates that the electrolyte service life will assume the curve extension when reducing the single-processing area or increasing the solution volume. To some extent, the initial voltage and gel deposition can indicate the active state of the electrolyte, and can be considered as the sign whether the electrolyte service life becomes due.

Download Full-text