According to the quality requirements of the nickel-phosphorus alloy coating in the soft X-ray grazing incidence cylindrical mirror, the purpose of this article is to introduce the method of chemically depositing nickel, which belongs to the mold replication method, to produce a super-smooth optical mirror. A nickel-phosphorus alloy layer was plated on an aluminum substrate, and then was fabricated into a super smooth surface by the single point diamond turning process and the fine polishing process. Then, a gold film was coated on the preformed nickel-phosphorus alloy layer. Another nickelphosphorus alloy was deposited on the gold film layer with better adhesion strength by an adapted the nickel deposited process. Then the outer layer of nickel-phosphorus alloy was demolded with the gold film. The target thickness of the deposited nickel-phosphorus alloys is 250±25 microns by the process described in this paper, which is different from the traditional method. The main formulation of the chemically deposited nickel-phosphorus alloy includes NiSO4·6(H2O), NaH2PO2·H2O, C6H8O7, CH3COONa. The testing results of the nickel-phosphorus alloy sheets was shown that the bonding force, corrosion resistance, porosity and other parameters were in line with the requirements for mirror production.
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