Patent ID: 8191261

Claim:
A method of manufacturing an aluminum sleeve for a magnetic roller, comprising the steps of: (a) directly chemical-etch an etching absorption layer on an outer surface of an aluminum sleeve by chemical texture etching process; and (b) overlappedly coating a nickel protective layer onto said etching absorption layer, wherein the thickness of said nickel protective layer is less than 10 μm; wherein the step (a) further comprises the steps of: (a.1) performing a cleaning process of said aluminum sleeve to clean said aluminum sleeve by chemically degreasing, washing by water, and clean-processing thereof; (a.2) performing an acid pretreatment process by disposing said cleaned aluminum sleeve into an acidic pretreated solution, wherein after said acid pretreatment of said aluminum sleeve, a plurality of micro etching pits and a plurality of pointers are provided on said outer surface of said aluminum sleeve in a crowded manner to form a positive charged terminal, wherein a working temperature of said acidic pretreated solution is set at 50° C. and a treatment time thereof is set for 2 minutes; (a.3) performing an alkaline roughing treatment process, wherein after said aluminum sleeve is treated by said acid pretreatment process, said aluminum sleeve is washed by water and is then disposed in an alkaline roughing solution for re-etching treatment, wherein a working temperature of the alkaline roughing solution is set at 65° C. and a treatment time thereof is set for 2 minutes; and (a.4) after said aluminum sleeve is treated by said alkaline roughness treatment process, disposing said aluminum sleeve in a 1:1 nitrate solution for wash-out surface preparation, wherein said aluminum sleeve is then cleaned and dried to form said etching absorption layer on said outer surface of said aluminum sleeve.