Metal Finishing Guide Book

2012-2013

Issue link: https://metalfinishing.epubxp.com/i/98750

Contents of this Issue

Navigation

Page 88 of 903

mizing hydrogen embrittlement. Stainless steels may be passivated as follows: 40% v/v of 42OB�� nitric acid at 75-145OF (24-63OC). 25% v/v of 42OB�� nitric acid, 6 oz/gal of molybdic acid at 70-150OF (21-66OC). Aqueous solutions of citric acid at 120 to 140OF (49-60OC) may also be evaluated. Note: Comprehensive information describing electropolishing (the anodic brightening and descaling of metals) and use of the Wood���s nickel strike are in the chapter titled ���Surface Preparation of Various Metal Alloys Before Plating and Other Finishing Applications.��� ACID TREATMENT OF OTHER METALS AND ALLOYS Aluminum Bright Dipping 1. Nonetch aluminum soak cleaner. 2. Chemically polish in a special acid solution consisting of: 94% v/v of 85% phosphoric acid and 6% v/v of 42OB�� nitric acid at 180-185OF (82-85O), until desired surface polishing is achieved. Descaling 1. Nonetch aluminum soak cleaner. 2. 3-5% sulfuric acid or phosphoric acid dip. Neutralizes Get Out of a Pickle With and conditions the surface. 3. Chemically polish in 15�� 20% v/v sulfuric acid and 30-40% by wt. of ferric sul��� Acid additive for scale, smut and fate at 100-140OF (38-60OC). oil removal Solution is wetted and specially inhibited. ��� Enhance heat treat scale removal 4. Tarnish inhibit in dip application using a soap ��� Extends acid life (mechanical tarnish inhibit ��� Reduces rejects film) or apply on organic topcoat such as a lacquer. Greatly improve the performance of your hydrochloric or sulfuric acid Conditioning for Plating pickle with Ambienol�� C. Used by Note: Comprehensive informaplaters nationwide. Available in 5 tion describing aluminum and 55 gallon containers. alloys, castings, and suggested AMBIENOL C deoxidizer/desmutting baths is described in the chapter titled, ���Surface Preparation of Various Metal Alloys Before Plating and Other Finishing Applications.��� METALLINE CHEMICALS CORP. 262-241-3200 ��� Fax: 262-241-8712 Email: info@metallinechemicals.com www.metallinechemicals.com www.metalfinishing.com/advertisers 85

Articles in this issue

Links on this page

view archives of Metal Finishing Guide Book - 2012-2013