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Electrodeposition of Stainless Steel

IP.com Disclosure Number: IPCOM000085112D
Original Publication Date: 1976-Feb-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Missel, L: AUTHOR

Abstract

Stainless steel compositions as well as alloys of other Ni Cr Fe ratios can be plated on a metal surface using glycolic acid as a complexer. Halide salts such as chlorides are suitable as a source of metal ions for the ternary alloy. A buffering agent such as boric acid is used to promote deposition. The boric acid maintains the pH of the boundary layer. A wetting agent such as a fluorinated surfactant eliminates striation and tapered pits in the deposited surface. The wetting agent provides a bright, uniform deposit.

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Electrodeposition of Stainless Steel

Stainless steel compositions as well as alloys of other Ni Cr Fe ratios can be plated on a metal surface using glycolic acid as a complexer. Halide salts such as chlorides are suitable as a source of metal ions for the ternary alloy. A buffering agent such as boric acid is used to promote deposition. The boric acid maintains the pH of the boundary layer. A wetting agent such as a fluorinated surfactant eliminates striation and tapered pits in the deposited surface. The wetting agent provides a bright, uniform deposit.

Additives such as polyethylene glycol and zirconium salts can be added to increase the percentage of Cr deposited and the efficiency of the bath. The optimum pH range for the bath is 2.8 - 3.2. The deposition of Cr drops sharply outside of this pH range. Ambient temperature is preferred for the bath. A higher temperature reduces the Cr content of the plating. A lower temperature slightly increased the Cr deposition but not significantly. A nickel anode is preferred.

EXAMPLE. A typical composition for the plating of 18% Cr and 10% Ni stainless steel on a copper substrate includes: CH(2)OHCOOH(70%)(glycolic acid) 150 ml/l

CrCl(3) . 6H(2)O 200 g/l

FeCl(2) . 4H(2)O 10 g/l

NiCl(2) . 6H(2)O 12 g/l

H(3)BO(3) 45 g/l

Wetting agent 100 mg/l

ZrOCl2 . 8H(2)O 15 g/l

pH 3.1

Current density 48 ma/cm/2/

Agitation None

Anodes Ni

Temperature Ambient.

The ratio of glycolic acid to the chromium salt content must be sufficient to min...