OPTICAL SYSTEMS LIGHT-ABSORBING ELEMENTS ON THE STAINLESS STEEL SUBSTRATES PRODUCTION METHOD Russian patent published in 2019 - IPC G02B1/11 C25D11/00 G02B5/08 

FIELD: optics.

SUBSTANCE: invention can be used for the optoelectronic devices and optical systems light-absorbing elements manufacturing. Essence of the invention consists in the fact, that optical systems light-absorbing elements on the stainless steel substrates manufacturing method involves the substrates preliminary preparation by degreasing and washing in cold water, subsequent etching in the mixed mineral acids solution, application of the target light-absorbing coating layer. At that, of stainless steel parts surface etching operation is performed in solution of the following composition (g/l): nitric acid 350–400; hydrofluoric acid 20–25, at room temperature, for not more than 20 minutes, after which preliminary nickel plating is performed in electrolyte of composition (g/l): nickel chloride 200–250; hydrochloric acid 50–100, with current density of 3–5 A/dm², temperature of 15–25 °C, for 5–15 minutes with nickel anodes, then performing the galvanic copper plating process in electrolyte of composition (g/l): copper sulfate 100–250; sulfuric acid 50–100; rectified ethyl alcohol 10–30 ml/l, at current density of 1.5–2 A/dm², temperature of 15–45 °C, for 4–5 hours, with copper anodes in covers, and the final target coating is performed by the chromium plating in electrolyte of composition (g/l): chromic anhydride 250–280; boric acid 10–15; sodium acetic acid 3.0–5.0, with current density of 30–75 A/dm², temperature of 15–30 °C, for 5–15 minutes with insoluble lead anodes with the light-absorbing layer production.

EFFECT: technical result is enabling the possibility to increase the preset surface purity, given optical properties, improved coating adhesion to the stainless steel substrate.

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