METHOD OF MANUFACTURING LIGHT-ABSORBING ELEMENTS OF OPTICAL SYSTEMS ON STEEL SUBSTRATES Russian patent published in 2018 - IPC C25D5/12 G02B1/00 

FIELD: technological processes.

SUBSTANCE: invention relates to the field of galvanotechnics and can be used to fabricate light-absorbing elements of optical electronic devices and optical systems of mirrors, telescopes of space vehicles. Method includes preliminarily preparing the steel substrate, degreasing and washing, pickling in a mineral acid solution and applying a light-absorbing coating, the etching of the substrate is carried out in a solution of hydrochloric acid of concentration 380–400 g/l at room temperature for 20–30 minutes, then the surface of the steel substrate is clarified by treatment in a solution containing chromium anhydride 60–100 g/l and sulfuric acid 5–15 g/l at room temperature for 10–20 s, galvanic deposition of copper on the substrate is carried out to obtain a sublayer of copper in a standard electrolyte, and a chromium-containing light-absorbing coating is obtained by electroplating chromium in an electrolyte of the following composition, g/l: chrome anhydride 250–280, boric acid 10–15, sodium nitrate 3.0–5.0, with a current density of 30–75 A/dm², temperature 15–30 °C for 5–15 minutes, the substrate is washed in running cold water and dried in the open air at room temperature.

EFFECT: increasing the adhesion of the coating to the substrate due to the obtaining of a given topography of the roughness of the surface treatment, providing the specified optical indicators of the light absorption, and also obtaining a coating, in which the volume of gas release is minimal.

1 cl, 1 dwg, 1 ex