Influencing factors of surface roughness of MAO ceramic coating on AZ91D
(1.School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, China
2.黑龙江省哈尔滨市哈尔滨工业大学机械电子工程学院)
2.黑龙江省哈尔滨市哈尔滨工业大学机械电子工程学院)
Abstract: To investigate the treating parameters’ influence on the surface roughness of the MAO ceramic coating on AZ91D, experiments were implemented in the alkaline electrolyte by using a pulse power source with positive and negative pulse, and the surface roughness was measured and analyzed by using a Times roughness-meter and an optical microscope. The machining parameters’ influencing rule on the coating surface roughness was investigated. The result indicates that the influence of all parameters is interactive, while the positive voltage and the electrolyte concentration, or increasing the frequency and the positive and negative voltage ratio are appropriate, the coating surface roughness will be improved.
Key words: magnesium alloy; AZ91D; treating parameter; surface roughness; MAO ceramic coating