Metal Finishing Guide Book

2013

Issue link: https://metalfinishing.epubxp.com/i/218436

Contents of this Issue

Navigation

Page 302 of 843

Watts Nickel Conventional Sulfamate Concentrated Sufamate Electro Composition, g/L NiSO46H2O Ni(SO3NH2)24H2O NiCl26H2O H3BO3 Temperature, oC Agitation Current density, A/dm2 Anodes pH 225 to 300 37 to 53 30 to 45 315 to 450 0 to 22 30 to 45 500 to 650 5 to 15 30 to 45 44 to 66 Air or mechanical 3 to 11 Nickel 3.0 to 4.2 Operating Conditions 32 to 60 Air or mechanical 0.5 to 32 Nickel 3.5 to 4.5 normally 60 or 70 Air or mechanical Up to 90 Nickel 3.5 to 4.5 Mechanical Properties 416 to 620 10 to 25 170 to 230 0 to 55 (tensile) 400to 600 10 to 25 150 to 250 see text Tensile strength, MPa 345 to 485 Elongation, % 15 to 25 Vickers hardness, 100 g load 130 to 200 Internal stress MPa 125 to 185 (tensile) Table III. Nickel Electroplating Solutions and Typical Properties of the Deposits examples of this second of class brighteners are formaldehyde, coumarin, ethylene cyanohydrin, and butynediol. The combination of organic addition agents makes it possible to obtain smooth, brilliant, lustrous deposits over wide ranges of current density. The deposits have a banded structure consisting of closely spaced laminations believed to be related to the co-deposition of sulfur. Certain cations, for example. zinc, selenium, and cadmium, enhance the luster of electrodeposited nickel, and have been used in combination with the organic additives. Supply houses provide instructions for proprietary bright nickel processes that specify rates of replenishment and methods of analyses for specific addition agents. Semibright Nickel Semibright nickel solutions contain nickel sulfate, nickel chloride, boric acid, and a leveling agent. The original process used coumarin as the principal additive. Coumarin-free processes are now available. The process yields deposits that are semilustrous. 800-962-9900 or 800-576-8905 Fax: 626-653-3804 Web: www.TMCSupplies.com 812 1/2 N. Grand Ave., Covina, CA 91724 www.metalfinishing.com/advertisers 295

Articles in this issue

Links on this page

view archives of Metal Finishing Guide Book - 2013