Technical Process Bulletin

Transcription

1 Type of Bulletin: Technical Process Bulletin Product Title: ALMECO 730 Product View: ALMECO 730 Description: Anodizing Additive Status: complete ALMECO 730 Anodizing Additive Technical Process Bulletin Technical Process Bulletin No This Revision: 06/02/ Introduction: ALMECO 730 is a liquid additive for sulfuric acid anodizing baths that reduces time, energy consumption, and the amount of refrigeration required for a given anodizing process. ALMECO 730 also produces a harder coating with increased coating density on conventional anodized aluminum. 2. Operating Summary: Chemical: Sulfuric Acid ALMECO 730 Bath Preparation per 100 Gallons: 9.5 to 15 gallons 1.5 to 4.0 gallons Operation and Control: ALMECO 730 Concentration: Sulfuric Acid Concentration: Dissolved Aluminum Concentration: Temperature: g/l g/l 3-15 g/l 66-85ºF (19-29ºC) Current: amps/ft 2 Voltage: Time: volts minutes

2 3. The Process: A. Cleaning B. Rinsing C. Etching (or optional bright dipping) D. Water rinsing E. Desmutting F. Water rinsing G. Anodizing H. Rinsing I. Electrolytic coloring or dying (optional) J. Rinsing K. Sealing 4. Materials: ALMECO 730 Sulfuric Acid, concentrated Testing Reagents and Apparatus 5. Equipment Recommendations: ALMECO 730 is compatible with equipment used for a typical sulfuric acid anodizing bath. 6. Anodizing with the ALMECO 730 Solution: Buildup: Fill the tank about three-fourths full with water. Turn on the agitation and cooling system. And slowly add 11 to 15 gallons of sulfuric acid per 100 gallons of bath and circulate, then add 1.5 to 4.0 gallons of ALMECO 730 per 100 gallons of bath. Add sufficient water to bring the solution up to working level and cool to operating temperature, if necessary. Operation: Time: 10 to 50 minutes Temperature: F (19-29 C) Current density: 12 to 24 amps/ft2 Voltage: 15 to 25 volts Note: These conditions are typical of most Type II anodizing lines. The ALMECO 730 bath will operate successfully at higher current densities and voltages for Type III (hardcoat) anodize. For consistent anodic coatings, once the desired parameters are set, the sulfuric acid and ALMECO 730 concentrations, time, temperature and current density should be maintained closely. This is especially important for electrolytically colored work. Your Henkel Surface Technologies technical representative can assist in selecting the optimum operating parameters. 7. Solution Control: Sulfuric Acid and aluminum titration: Free Sulfuric Acid: 1. Pipet 5.0 ml of the anodizing bath into a 250 ml beaker or Erlenmeyer flask. 2. Add 50 ml of DI water. 3. Add 20 ml of Reagent Solution 1584 (50% w/w Potassium Fluoride solution) and mix.

3 4. Add 3 to 4 drops of Indicator #3 (Phenolphthalein). 5. Titrate with Titrating Solution #89 (1.0N Sodium Hydroxide) to a pink end point. Record number of ml required as A. Aluminum Content: Repeat procedure A above, except do not add Reagent Solution 1584 noted in step 3, and record ml of Titrating Solution #89 required as B. Calculations: Free Sulfuric Acid: g/l = A x 9.8 Aluminum: g/l = (B-A) x 1.8 ALMECO 730 Concentration: Experience has shown that the ALMECO 730 concentration will drop off at about the same rate as the sulfuric acid concentration as the bath is being used. The recommended way to replenish the ALMECO 730 is to add it to the bath whenever sulfuric acid needs to be added to maintain the acid concentration, at the same ratio as was used in the initial build-up of the anodizing bath, or add about 0.12 gallons of ALMECO 730 for every gallon of sulfuric acid. The control method listed below is one way to determine the actual ALMECO 730 concentration. This method requires considerable care and accuracy to produce meaningful data. A. STANDARDIZATION: 1. Pipet 25 ml of the approximately Titrating Solution 31 (0.1N Ferrous Sulfate) into a clean 500 ml Erlenmeyer flask. 2. Add 100 ml of distilled or deionized water. 3. Add 25 ml of Reagent Solution 44 (50% Sulfuric Acid) solution. 4. Add 4 drops of Indicator 12 (Ferroin) and titrate with Titrating Solution 1564 (0.1N Ceric Sulfate solution) until the red color disappears. CALCULATIONS: Factor (F) = Ml of T.S NOTE: The standardization should be done at least weekly. Keep Titrating Solution # 31 in a cool, dark place. T.S. #31 should be discarded if the ml required of T.S for this titration is less than 15 ml. B. BATH ANALYSIS 1. Pipet 50 ml of the anodizing solution into a clean one liter Volumetric flask. 2. Add distilled or deionized water to the 1000 ml mark and mix well with a magnetic stirrer. 3. Pipet a 25 ml aliquot of the diluted solution into a clean 500 ml Erlenmeyer flask. 4. Add 25 ml of Reagent Solution 44 (50% Sulfuric Acid) and 25 ml distilled or deionized water. 5. Using a pipet, accurately add 25 ml of Titrating Solution 1564 (0.1N Ceric Sulfate). 6. Add 2-3 pieces of glass beads and gently boil for minutes. 7. Cool to room temperature and add distilled or deionized water to the 200 ml mark. 8. Add 3-5 drops of Indicator #12 and titrate to a red end point with T.S. #31 (0.1N Ferrous Sulfate Solution). Record the ml of T.S.#31 as

4 "A". CALCULATIONS: % by volume ALMECO 730 = 25 - (A x F) Handling Characteristics: ALMECO 730 contains highly acidic materials and is corrosive. Contact with the skin or eyes may cause irritation or burns. The same safety precautions should be observed as when handling mineral acids. Personnel should wear eye-protection, NIOSH approved air mask, rubber gloves and apron when working with ALMECO 730. Tanks used for ALMECO 730 should be provided with an adequate exhaust system to protect workers against irritating airborne contaminants. Material Safety Data Sheets are available upon request from Henkel Surface Technologies. 9. Storage Requirements: ALMECO 730 should be stored in a cool, dry area away from alkaline or oxidizing materials. Keep container tightly closed when not in use. 10. Waste Disposal Information: ALMECO 730 may require neutralization to a specified ph range depending on Federal, State and local waste treatment regulations. Waste disposal methods for ALMECO 730 are available upon request from Henkel Surface Technologies.

5 Testing Reagents and Apparatus (Order only those items that are not already on hand) Code Quantity Item ml Indicator 3 (Phenolphthalein) Indicator Solution liter Titrating Solution 89 (1.0N Sodium Hydroxide) liter Reagent Solution 1584 (Potassium Fluoride) ml Indicator 12 (Ferroin) liter Reagent Solution #44 (50% w/w Sulfuric Acid) liter Titrating Solution 31 (0.1N Ferric Sulfate) liter Titrating Solution 1564 (0.1N Ceric Sulfate) ml Volumetric Pipet ml Erlenmeyer Flask ml Volumetric Flask ml Volumetric Pipet ml Volumetric Pipet ml Volumetric Pipet Henkel Technologies Stephenson Highway Madison Heights, MI Telephone: Fax: "The information presented herein is our interpretation of certain test results and field experience to date. This information is not to be taken as warranty or representation for which we assume legal responsibility, nor as permission or recommendation to practice any patented invention without a license. It is offered solely for your consideration, investigation and verification." Henkel Corporation. Henkel Technologies Stephenson Highway Madison Heights, MI Telephone: Fax: "The information presented herein is our interpretation of certain test results and field experience to date. This information is not to be taken as warranty or representation for which we assume legal responsibility, nor as permission or recommendation to practice any patented invention without a license. It is offered solely for your consideration, investigation and verification." Henkel Corporation. Stand vom: gedruckt am: 09/18/ Verborgene Felder: 8Parker Amchem Form Revised 04 June 2001