Abstract: The formability of the hot incremental forming of AZ31 magnesium alloy sheet and the lubricating Mechanism of the porous ceramic coating were investigated by CNC machine and microarc oxidation (MAO) treatment. The results showed that the porous ceramic coating on top of AZ31 magnesium alloy was obtained by MAO treatment and after adsorbing MoS2powder, porous ceramic-MoS₂ lubricating film was formed. MoS₂ powder coated ceramic coating had the initial friction coefficient about 0.08 at room temperature and can be applied for hot incremental forming of the metal sheet. Porous ceramic coating provided a good lubricating platform for MoS₂ lubricant. The inner surface of the formed part was smooth without any defect. The ceramic coating was self–lubricating in the incremental forming at elevated temperatures. Compared with the sheet without MAO treatment, Porous ceramic coating has better lubricating effect.

Key words: magnesium alloy, incremental forming, microarc oxidation, ceramic coating, MoS₂;

Author: Zhang Qinglai, School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China

E-mail: qlfzhang@sh163.net

Tribology, Vol. 29, Issue 6, 2009, 606~611