Effect of K_2Cr_2O_7 concentration on army green ceramic layer formed of 2A12 alloy by Micro-arc Oxidation

摘要

2A12 alloy by MAO on main salts electrolyte system of phosphate sodium is investigated. By contrast test, the influences of arc starting voltage, the thickness of the ceramic layer, growth rate, and wear resistance with different K_2Cr_2O_7 concentration are analyzed. If K_2Cr_2O_7 concentration is 2.5 g/L, the arc starting voltage reached the lowest, the surface topography is the best, the wear resistance is the well.