Patent ID: 7722754
Filing Date: 2010-05-25
Classification: C25D,Y10T

Abstract:
1. A method of manufacturing a microstructure wherein an aluminum member having an aluminum substrate and a micropore-bearing anodized film present on a surface of the aluminum substrate is subjected at least to, in order, a pore-ordering treatment which involves performing one or more cycles of a step that includes a first film dissolution treatment for dissolving the anodized film until a barrier layer has a thickness of 3 to 50 nm, and an anodizing treatment which follows the first film dissolution treatment; and a second film dissolution treatment for dissolving the anodized film so that a ratio of a diameter of a micropore opening “a” to a micropore diameter at a height “a/2” from a micropore bottom “b” (a/b) is in a range of 0.9 to 1.1, whereby the microstructure having micropores formed on a surface thereof is obtained, wherein the first film dissolution treatment is carried out by bringing the aluminum member into contact, by immersion, with one of: an aqueous acid solution containing no chromic acid and an aqueous alkali solution wherein the first dissolution treatment is performed without passing an electrical current.