Patent ID: 9127170
Filing Date: 2015-09-08
Classification: B05D,C09D,C23C

Abstract:
1. A production method for an aluminum substrate for hard disk devices, comprising applying electroless Ni plating to an aluminum substrate in a plating step, wherein a plating pretreatment solution is used as a pretreatment before the plating, the solution including iron ions at a concentration of 0.1 g/L to 1.0 g/L, and nitric acid at a concentration of 2.0 wt % to 12.0 wt %, wherein the pretreatment is a desmutting treatment and a de-zincate treatment performed after a zincate treatment, and wherein the number of pits generated on the plated surface of the aluminum substrate is 0.105 pits/mm 2 or less.