| 摘要 |
<p>The problem addressed by the present invention is to obtain a hard disk substrate that can obtain a smooth plating film surface by means of electroless NiP plating, and that does not have worsened acid corrosion resistance. The method for producing a hard disk substrate includes: a first plating step wherein a substrate is immersed in a first electroless NiP plating bath containing an additive having a leveling effect, forming at the surface of the substrate an electroless NiP plating film bottom layer having a lower average surface roughness than the surface; and a second plating step wherein the substrate to which the electroless NiP plating film bottom layer has been formed by means of the first plating step is immersed in a second electroless NiP plating bath, forming an electroless NiP plating film top layer having acid corrosion resistance. From the first plating step until transitioning to the second plating step, contact of the bottom layer to the atmosphere is suppressed.</p> |
