Stock material or miscellaneous articles – All metal or with adjacent metals – Composite; i.e. – plural – adjacent – spatially distinct metal...
Patent
1990-01-07
1991-12-24
Valentine, Donald R.
Stock material or miscellaneous articles
All metal or with adjacent metals
Composite; i.e., plural, adjacent, spatially distinct metal...
428661, B32B 1520
Patent
active
050751786
ABSTRACT:
The invention relates to a cyanide-free electrolyte being harmless to the environment and to health which makes feasible the production of black surface layers on light metals or on alloys of the latter, preferably titanium, remaining deeply-black and adhesive even after extreme changes in the ambient temperature and having nearly equal values of the optical absorptivity of radiation and of the thermal emission capability (the .alpha./.epsilon.-ratio is about 0.95) by means of the anodic oxidation by spark discharge (ANDF-method). These layers are absolutely X-amorphous and show, hence, an ideal optically isotropic behavior regarding the reflection of radiation. Due to their minmum evolution of gases they offer a high thermovacuum stability. The electrolyte consists of an ammoniacal solution of K.sub.2 H.sub.2 PO.sub.4 potassium dihydrogenphosphate and K.sub.2 CrO.sub.4 potassium chromate. The homogeneity of the optically black layers is ensured by not using fluoride ions and employing acetate ions. Such layers comprise titanium, chromium and copper in ratios of Cr:Ti=1: (1.9 to 2.2) and Cr:Cu=1:(0.8 to 1.3).
REFERENCES:
patent: 3268306 (1966-08-01), Jefferys
patent: 3446606 (1969-05-01), Friedrich et al.
patent: 4305998 (1981-12-01), Manty et al.
patent: 4448853 (1984-05-01), Fischer et al.
Erdmann Roland
Furche Thomas
Hasse Anja
Heppner Martin
Hofmann Andreas
Jenoptik Jena GmbH
Valentine Donald R.
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