Influences of Current Density on Tribological Characteristics of Ceramic Coatings on ZK60 Mg Alloy by Plasma Electrolytic Oxidation

2010 ◽  
Vol 2 (3) ◽  
pp. 808-812 ◽  
Author(s):  
Xiaohong Wu ◽  
Peibo Su ◽  
Zhaohua Jiang ◽  
Song Meng
Keyword(s):  
Current Density ◽  
Plasma Electrolytic Oxidation ◽  
Ceramic Coatings ◽  
Mg Alloy ◽  
Tribological Characteristics ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic

Influences of Current Density on Tribological Characteristics of Ceramic Coatings on 6061 Al Alloy by Plasma Electrolytic Oxidation

2011 ◽  
Vol 239-242 ◽  
pp. 1892-1895
Author(s):  
Xiao Dong Wang ◽  
Xiao Hong Wu ◽  
Rui Wang ◽  
Song Tao Lu
Keyword(s):  
Current Density ◽  
Plasma Electrolytic Oxidation ◽  
Ceramic Coatings ◽  
Tribological Characteristics ◽  
Al Alloy ◽  
Friction Testing ◽  
Electrolytic Oxidation ◽  
Current Densities ◽  
Plasma Electrolytic ◽  
6061 Al Alloy

Plasma electrolytic oxidation (PEO) of an 6061 Al alloy was accomplished in an electrolyte with sodium hexametaphosphate (10 g/L) and sodium silicate (10 g/L) Coatings were produced at four different current densities (4, 6, 8 and 10 A/dm2). Phase composition, morphology and tribological characteristics of the coatings were studied by X-ray diffraction (XRD), scanning electron microscope (SEM) and ball-on-disk friction testing. The results show that among the four ceramic coatings which were produced under four current densities, the coating produced under the current density of 8 A/dm2 got the lowest wear rate with the value of 4.5 × 10-5 g/m.

Characterization of Graphite Containing Ceramic Coating Prepared on Carbon Steel by Plasma Electrolytic Oxidation

2012 ◽  
Vol 271-272 ◽  
pp. 46-49 ◽  
Author(s):  
Yun Long Wang ◽  
Miao Wang ◽  
Ming Zhou ◽  
Zhao Hua Jiang
Keyword(s):  
Carbon Steel ◽  
Current Density ◽  
Bonding Strength ◽  
Plasma Electrolytic Oxidation ◽  
Substrate Surface ◽  
Ceramic Coatings ◽  
Electrolytic Oxidation ◽  
Q235 Carbon Steel ◽  
Current Densities ◽  
Plasma Electrolytic

Ceramic coatings containing graphite were prepared on Q235 carbon steel by plasma electrolytic oxidation (PEO) in aluminate electrolyte with graphite dispersed in electrolyte. The microstructure and properties of the coatings including phase composition, surface and cross section morphology, thickness and bonding strength were characterized. The results showed that the coating consisted of FeAl2O4, Fe3O4 and a certain amount of graphite. The coating was typically characterized by micro pores and ball-shaped round grains distributed on the surface. With increasing the treating current density, the pores became bigger and the ball-shaped round grains became more. Coatings obtained with various current densities showed a good interface between the coating and substrate. The bonding strength of the coatings decreased a little when increasing the current densities, the values of which were all above 20MPa. The coating grew both inwards and outwards to the substrate surface. With increasing the treating current density, the consumption of substrate gradually increased but the whole thickness was not strongly affected by the current density and the value was about 115 μm.

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