Study Of ZA43 Alloy Micro-arc Oxidation

The paper applied micro-arc oxidation technology in ZA43 alloy and studied its feasibility. Firstly, we put forward micro-arc oxidation parameter system through many experiments. Then we studied ZA43 alloy oxidation technology condition in the different electrolyte, studied the influence of electronic parameter on ceramic thickness and hardness under the constant oxidaton time, analyzed the influence of oxidation time on the growth speed and thickness of the ceramic coating, analyzed ceramic coating surface morphology in different electrolyte by SEM, analyzed ceramic coating composition by XRD, measured ceramic coating microhardness in different electrolyte by durometer, measured wear resistance property by abrasion machine, measured bond strength between coating and matrix by scratch tester, discussed the theory of micro-arc oxidation processing.The result shows that the striking voltage is different when ZA43 treated by micro-arc oxidation in different electrolyte, the striking voltage and ceramic coating surface morphology is related to composition and concentration of the electrolyte. The current density influences the final coating thickness and its hardness increases with the increase of current density, but it changes little when it reaches extremum. The influence of oxidation time on coating growth is obviously, the growth speed varies from large to small with the increase of oxidation time and the thickness doesn't change when it reaches equilibrium at last. The primary composition of coating is a great deal of α -Al₂O₃ and a few y -Al₂O₃. The content of α -Al₂O₃ in outer layer is more than that in inner layer while the content of γ -Al₂O₃ is contrary. The coating hardness increases with the increase of the coating thickness, its hardness reaches extremum when its thickness reaches maximum. The difference of the coating hardness in different electrolyte is not obviously and its hardness increases about ten times than that of matrix. The wear resistance property of the coating improves obviously than that of matrix, and the bond between coating and matrix is good, its strength is 27N.So, ZA43 can improve its surface property and expand its application after treated by micro-arc oxidation.