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Technique for Increasing the Corrosion Resistance of Hardened Carbon Steel

IP.com Disclosure Number: IPCOM000035387D
Original Publication Date: 1989-Jul-01
Included in the Prior Art Database: 2005-Jan-28
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Bindra, P: AUTHOR [+2]

Abstract

A technique for increasing the corrosion resistance of hardened carbon steel is described below and the particular sequence of the steps is critical in achieving the results of uniformity and good adherence of a corrosion resistance metal film. Details of the technique include the following steps: 1)Degrease: Trichloroethylene, mechanical (lint-free cloth) or ultrasonic. 2)Pure nitrogen or argon dry. 3)Soak cleaner - Composition: 0.5-1M Sodium Hydroxide 0.1-0.25M Sodium Metasilicate 0.1-0.25M Sodium Carbonate 0.01-0.04M Sodium Tripolyphosphate 0.005-0.02M Sodium Lauryl Sulfate 0.5-1.0% by volume polyethylene glycol 400 M.W.avg. Temperature = 85oC Cycle time = 5-15 min. Moderate agitation. 4)DI Water rinse Temperature = 70oC Moderate agitation. 5)Electrolytic Clean (Anodic) Composition: 0.75-1.5M Sodium Hydroxide 0.2-0.

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Technique for Increasing the Corrosion Resistance of Hardened Carbon Steel

A technique for increasing the corrosion resistance of hardened carbon steel is described below and the particular sequence of the steps is critical in achieving the results of uniformity and good adherence of a corrosion resistance metal film. Details of the technique include the following steps: 1)Degrease: Trichloroethylene, mechanical (lint-free cloth) or ultrasonic. 2)Pure nitrogen or argon dry. 3)Soak cleaner - Composition: 0.5-1M Sodium Hydroxide 0.1-0.25M Sodium Metasilicate 0.1-0.25M Sodium Carbonate 0.01-0.04M Sodium Tripolyphosphate 0.005-0.02M Sodium Lauryl Sulfate 0.5-1.0% by volume polyethylene glycol 400 M.W.avg. Temperature = 85oC Cycle time = 5-15 min. Moderate agitation. 4)DI Water rinse Temperature = 70oC Moderate agitation.
5)Electrolytic Clean (Anodic) Composition: 0.75-1.5M Sodium Hydroxide 0.2- 0.4M Sodium Metasilicate 0.01-0.015M Sodium Tripolyphosphate 0.025-0.05M Sodium Carbonate 0.002-0.004M Sodium Lauryl Sulfate Temperature = 85oC 60 - 90 mA/sq. cm. current density (anodic) Moderate agitation. Cycle time = 5-15 min. 6)DI Water Rinse Temperature = 50oC Running rinse 10-15 min. 7)HCL Dip: 5% HCL Solution Temperature = Room Temp. Time = 60 Sec. 8)Palladium Seed 0.12M HCL 0.0022M Palladium Chloride Temperature = Room Temp. Time = 2 min. 9)DI Water Rinse Temperature = 50oC Time = 3-5 min. 10)Electroless Copper Plate Solution Type: Copper sulfate, EDTA, CN-, NaOH, Sur...