Technique for Increasing the Corrosion Resistance of Hardened Carbon Steel
Original Publication Date: 1989-Jul-01
Included in the Prior Art Database: 2005-Jan-28
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.