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Precision polishing composition, the polishing method of the Al alloy substrate electroless NiP plated film formed on the manufacturing method of the Al alloy substrate with an electroless NiP plating film
Precision polishing composition, the polishing method of the Al alloy substrate electroless NiP plated film formed on the manufacturing method of the Al alloy substrate with an electroless NiP plating film
PROBLEM TO BE SOLVED: To obtain a composition for polishing, capable of polishing a magnetic disc substrate, especially aluminum disc substrate used for memory device of computer, etc., into mirror plane having high precision and suitable for producing a magnetic disc substrate having high recording density. ;SOLUTION: This composition for precision polishing is used for polishing an electroless NiP plating film formed on an Al alloy substrate and the composition comprises water, α-alumina particles and a polishing promoter and, as the α-alumina particles, fine particle gibbsite is used as a raw material, or the alumina particles has 0.35-0.55μm average particle diameter (D50), or 90% particle diameter (D90) of the α alumina particles is ≤0.7μm, or maximum particle diameter (Dmax) of the α alumina particles is ≤1.4μm.;COPYRIGHT: (C)1997,JPO
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