6063铝材微弧氧化最佳电流密度和槽液温度的探讨

Discussion of the Best Current Density and Bath Temperature in Micro-Arc Oxidation of 6063 Aluminum Materials

目前的铝合金微弧氧化工艺存在电流密度高、槽液温度范围窄等不足,使其应用受到了限制。为此,从铝材低电流密度和宽槽液温度方面研究了6063铝材的微弧氧化工艺,探讨了微弧氧化工艺中电流密度及槽液温度对起弧电压、起弧时间及膜层厚度等的影响。结果表明,同等条件下,电流密度越大,则起弧电压越低,起弧时间越短,膜层越厚;槽液温度越高,则起弧电压越低,起弧时间越短,膜层越厚;在10min内,得到12μm厚度的膜层,同等时间内比普通阳极氧化膜厚提高4倍;微弧氧化膜的表面显微硬度相对6063铝材高7倍以上。

The technology for micro-arc oxidation of 6063 Al materials at lowered current density and broadened rangeof bath temperature was investigated. The effects of current densi-ty and bath temperature on the arcing voltage,arcing time and thickness of micro-arc oxidation coatings were explored. Resultsindicate that while other conditions are kept unchanged,the lar-ger the current density is,the lower the arcing voltage,the shor-ter the arcing time and the thicker the micro-arc oxidation coating will be. Similarly,the higher the temperature of the bath is,thelower the arcing voltage,the shorter the arcing time and the thic-ker the micro-arc oxidation coating will be. It was feasible to pre-pare oxide coating with a thickness of 12 μm within 10 minutes bymaking use of the established micro-arc oxidation technology,and the thickness of the coating was as much as 5 times of that prepared via conventional micro-arc oxidation. At the same time,the microhardness of the oxide coating prepared by using the pres-ent technology was as much as 8 times of that of 6063 Al sub-strate.