ELECTROLYTIC PLATING OF BLACK CHROMIUM ON METALS,

reportActive / Technical Report | Accession Number: AD0683968 | Need Help?

Abstract:

Methods of electrolytic plating of metals with black chromium from electrolytes containing chromic acid and activator substances are known. When such substances are not present, hydrogen is given off from the cathode and the deposition of chromium does not take place. The proposed method is distinguished by the use of an electrolyte containing in gramsliter chromic acid CrO3, 150-400 the fluorine compound cryolite Na3AlF6, 0.1-0.4 a compound of iron oxylate 15-75 and chromium protector 1.5-3 at c.d.5-15 Asq dm with a short period 1-2 minutes initial current pulse of c.d.25-50 Asq dm to obtain a uniform matte coating. Fluorides cryolite serve as the activating agents. Iron salts oxylate improve the coating power of the solution and decrease the luster of the coating. The coatings have a deep-black color and possess good protective qualities and adequate mechanical durability. Author

Author(s):
Samartsev, A. G. ; Andreeva, N. V.
Author Organization(s):
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
Supplementary Note:
Edited trans. of Patent (USSR) 188 252, 11 Jun 66 2p, by L. Thompson.
Annotation:
Electrolytic plating of black chromium on metals--Translation.
Pagination:
0005

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
FTD-HT-23-1005-68
 Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
(*ELECTROPLATING, *CHROMIUM), PATENTS, ELECTROLYTES, CHROMIC ACID, FLUORINE COMPOUNDS, IRON COMPOUNDS, USSR
Field(s)/Group(s):
Fabrication Metallurgy
Keyword(s):
TRANSLATIONS
Report Date:
1968 Nov 21