DE-88K. Ammonia free Temperature tolerance up to 110 F (43 C), reducing cooling costs. Zinc Plating System

Transcription

1 is a two component, ammonia free, water soluble zinc plating system suitable for either rack or barrel plating operations. is characterized by ease of control, consistent day to day operation, and excellent chromate receptivity. Mirror bright finish Excellent adhesion and ductility Suitable for either rack or barrel operation Economical to operate Ease of plating bath control Excellent chromate receptivity Ammonia free Temperature tolerance up to 110 F (43 C), reducing cooling costs PAVCO, Inc John Crosland Jr Drive Charlotte, NC Phone: Toll-free: or PAVCO INC ( ) Fax: Order Fax (for orders only)

2 2 Operating Parameters: Barrel Operation Zinc: Potassium chloride: Boric acid: Range oz/gal g/l oz/gal g/l 3-5 oz/gal g/l Optimum 3 oz/gal 22.5 g/l 32.0 oz/gal 240 g/l 3 oz/gal 22.5 g/l Current Density: 1-15 amps/ft 2 Rack Operation Zinc: Potassium chloride: Boric Acid: amps/dm oz/gal g/l oz/gal g/l 3-5 oz/gal g/l 3.5 oz/gal 26 g/l 32.0 oz/gal 240 g/l 3 oz/gal 22.5 g/l Current Density: 1-80 amps/ft amps/dm 2 DE 88 K Starter 3-5 % 3 % ZCl BRT II % 0.2% ph: Temperature: F C Anode to Cathode Area: 1:1 minimum 90 F 32 C Equipment: Tank: Anodes: Anode Baskets: Anode Bags: Anode S-Hooks: Anode Bars: Filtration: Rectifier: Temperature: Control: Ventilation: Agitation: Optional Equipment: A polypropylene, PVC, or Koroseal lined tank is required. Use Special High Grade (SHG 99.99% pure) zinc balls or slabs Titanium baskets are required. Keep the baskets filled with zinc anodes all the time and not to exceed 9 volts on the rectifier. Nylon or polypropylene bags are required for rack operations. Nickel plated S-hooks. Use copper anode bars, preferably shielded with plastic. Use a 5-15 micron cartridge packed with a filter aid or activated carbon. Filtration speed should be at least 1 tank turnover per hour. Sand filters have been found to work quite satisfactorily. Up to 12 volts The system is tolerant to temperatures ranging from F (21-43 C). A titanium heat exchanger is recommended for both cooling and heating. Recommended Air agitation is mandatory for rack operations. Automatic ph controller Automatic brightener feeder Automatic temperature control

3 3 Maintenance of the Solution: Zinc Potassium chloride Boric acid DE 88 K Starter ZCl BRT II By analysis By drag-out & analysis By drag-out & analysis By drag-out & analysis 1 gal / 20,000 30,000 amp hrs (1 l / 5,000 8,000 amp hrs) Bath Makeup per 1,000 gallons (3,785 l): 1. Prepare a lined tank by leaching it with 5% hydrochloric acid for hours. 2. Rinse the tank 3. Fill the lined tank with 500 gallons (2,000 liters) of water. 4. Add 45 gallons (170 liters) of 62.5% liquid zinc chloride and mix well to dissolve. 5. Add 200 pounds (90 kg) of boric acid and mix well to dissolve. 6. Add 2,000 pounds (910 kg) of potassium chloride and mix well to dissolve. 7. Hang slab anodes or zinc filled titanium anode baskets in the bath. 8. Add 30 gallons (113 Liters) of DE 88 K Starter 9. Add gallons ( Liters) of ZCl BRT II. 10. Add warm water to the 1,000 gallon (3785 l) level. Analytical Procedures: Zinc Reagents 1. Acetate Buffer -To makeup, dissolve: a)180 grams of sodium acetate b) 30 ml of acetic acid c) Add de-ionized water to make one liter 2. Xylenol Orange Indicator-To make this indicator liquid: a) One gram of Xylenol Orange b) Dissolved in 1 liter of de-ionized water M EDTA Solution Procedure 1. Into a 400 ml beaker pipette a 5 ml bath sample. CAUTION: Fumes are poisonous if using this method with a cyanide bath. 2. Add 150 mls de-ionized water. 3. Add 50 ml acetate buffer. 4. Add indicator 5. Titrate with 0.1 M EDTA until the color changes from red to yellow Calculation: ml of titration.176 = zinc in oz/gal ml of titration 1.32 = zinc in g/l

4 4 Total Chloride - Free Chloride Reagents 1. Buffer (Mix dextrin and calcium carbonate in a 1:1 ratio) 2. Chloride Indicator - Dissolve: a) 0.2 g of Dichlorofluorescein b) 70 mls of methyl alcohol c) De-ionized water to make 100 mls N silver nitrate solution Procedure 1. Pipette a 1 ml sample of zinc chloride plating bath into a 250 ml Erlenmeyer Flask 2. Add 100 mls of de-ionized water. 3. Add one scoop, approximately 2g, of buffer. 4. Add 1 ml of indicator 5. Titrate with 0.153N silver nitrate until the color changes from yellow to pink Calculation 1. mls of Silver Nitrate x = oz/gal total chloride (A) A x 7.49 = g/l total chloride (Am) 2. Zinc in oz/gal x = oz/gal chloride associated with the zinc metal (B) B x 7.49 = g/l chloride associated with the zinc metal (Bm) 3. A - B = oz/gal free chloride (C) Am - Bm = g/l free chloride (Cm) 4. C x 2.1= oz/gal of potassium chloride 5. Cm x 2.1 = g/l of potassium chloride Iron Test and Treatment per 1,000 gallons (3785 l): Procedure 1. Into a 100 ml beaker add 30 ml of clear bath sample (if the sample is not clear, filter it). 2. Add 1 ml of 3.5% hydrogen peroxide 3. Determine the concentration of the iron in the bath by the intensity of the color change. No change - no iron Slight precipitate - moderate iron Heavy precipitate - high iron 4. If the test indicates moderate or high iron, or if barrel spots are present, treat the bath for iron as follows: Dilute one pint (500 ml) of 35% or 50% hydrogen peroxide to 1 gallon (3.785 L) with water. Mix this diluted peroxide throughout the plating bath. Repeat steps 1 through 4 until the majority of the iron is precipitated. Filter out the precipitated iron.

5 5 Boric Acid Procedure Reagents 1. Bromocresol purple indicator 2. 1 N sulfuric acid 3. 1 N sodium hydroxide 4. Mannitol Procedure 1. Pipette a 5 ml sample into a 125 ml Erlenmeyer flask. 2. Add 20 mls of de-ionized water. 3. Add 1 ml of bromocresol purple indicator. 4. If the solution color is purple, start with Step A. If the solution color is yellow, start with Step B. a. Add 1N sulfuric acid, by drop, until the solution color turns yellow. b. Add 1N sodium hydroxide, by drop, until the solution color turns purple. c. Proceed with Step Add at least 5 grams of mannitol. (Excess mannitol at all times.) If the solution color doesn t change to yellow, the plating bath has no boric acid. 6. Zero the sodium hydroxide* burette and start titrating very slowly with 1N sodium hydroxide until the solution color changes from yellow to purple 7. Calculation: mls of sodium hydroxide 0.6 = boric acid in oz/gal *Note: The amount of sodium hydroxide added prior to Step 6 is NOT included. Boric acid in oz/gal X 7.49 = boric acid in g/l Normal Panel Control Panel Normal Hull Cell Panel Observe From Left to Right Area 1 High Current Density Area 2 Mid Current Density Area 3 Low Current Density

6 Black Discoloration Blister Gray 6 Frost Gray Low Current Density Problem Metal Contamination Problem High ph Low Total Chloride Low ener Blackish Discoloration Metallic contamination (either copper or cadmium) of the plating bath or the bright dip High Current Density Problem ener Problem Black Burn Semi- Low Zinc, High ph, Low Boric Acid, High ph,, Low temperature Chromium Contamination Low ener High & Low Current Density Problem Skip Chromium Contamination Low ener Iron Problem 267 ml Hull Cell: Agitation Mechanical or Air Temperature 90 F, 32 C Current & Time 2 amps/5 minutes High Iron (Black color shows up after the bright dip or chromate)

7 7 Pavco Inc s Hull Cell Scale: 1 AMP 2 AMPS. 3 AMPS. 5 AMPS. PANEL EDGE CU. FT. X 7.48 = GAL. GM/L X = OZ./GAL. OZ./GAL. X 7.5 = GM/LITER GAL. X 3785 = ML. A/SQ. FT. X = A/SQ. DM. AMPS./SQ. FT. 267 ML. OR 534 ML. HULL CELL TOTAL CURRENT 3 AMPS 5 AMPS. 7.5 GM./1000 ML. 7.8 ML./1000 ML. Trouble Shooting Chart: Problem Cause Solution High current density burn Low zinc level Add zinc chloride High current density area bright-dips black, or barrel work exhibits Low current density are dull or hazy Poor low current density coverage OR High current Low boric acid Low temperature High iron High ph Low total chloride Metallic or organic contamination High ph 2 GM/267 ML. HULL CELL = 1 OZ./GAL. = 6.25 LBS./100 GAL. 2 ML./267 ML. HULL CELL = 0.96 FL. OZ./GAL. = 6 PTS./100 GAL. 4 GM. 534 ML. HULL CELL = 1 OZ./GAL. = 6.25 LBS./100 GAL. 4 ML./534 ML. HULL CELL = 0.96 FL. OZ./GAL. = 6 PTS./100 GAL. AMPS./SQ. FT ML. HULL CELL PANEL EDGE Low total chloride Low/High ener Metallic contamination High zinc level (>6oz/gal or 45 g/l) Reduce current Add boric acid Raise temperature Treat for iron with diluted hydrogen peroxide Reduce ph Add potassium chloride Treat with zinc dust or carbon Reduce ph Add potassium chloride Check ener level in hull cell Treat with zinc dust Dilute the bath Poor low current density coverage Excess peroxide added Organic contamination Electrolyze bath Treat with carbon

8 8 Low current density area bright dips black Metallic contamination Treat with zinc dust Overall Haze Low ener Inadequate agitation Poor cleaning Work rusting before plating Poor bright dip Blue bright chromate out of balance or contaminated Temperature too high Add ener Increase agitation Improve cleaning Acidify rinses Remake bright dip; try HCl instead of nitric acid Remake chromate Decrease temperature Overall Dullness Low ener Metallic contamination High temperature temperature too high ph too low Organic contamination Add ener Treat with zinc dust Decrease temperature decrease temperature Raise ph Treat with carbon Slow Plating Speed Low zinc level Add zinc chloride Low total chloride Add potassium chloride Weak pickle or pickling problem Add more hydrochloric acid to the pickle or make a new pickle Low temperature Low current Smut formation in pickling Raise temperature Increase current Add PavPrep to the pickle Roughness Inadequate filtration Improve filtration Low anode area Increase anode area Particles from anodes Bag the anodes Current too high Lower the current Blistering Poor cleaning &/or pickling Improve pre-treatment Organic contamination Treat with carbon Blistering continued Metallic contamination Treat with zinc dust Chromium contamination Treat with peroxide High current Lower current High ener Hold ener Flaking or star dusting High ener Hold ener

9 9 Current interruption High current High ph Check all contacts Lower current Reduce ph Waste Treatment: Dispose of the concentrates or solutions thereof according to local waste treatment regulations. Safety: Handling Pavco mandates that the following safety equipment be used when handling chemicals in an electroplating environment: safety glasses, face shield, plastic or rubber apron, rubber gloves and safety shoes. Chemicals should only be handled by trained and experienced personnel. Storage Store Pavco products in a clean, well ventilated room which temperature remains above 45 F (7 C). Pavco products should remain in their original container with the lid or cap tightened. Drum pumps or pails must be clean prior to dispensing Pavco products to prevent contamination. If DE 88 K Starter or ZCl BRT II freezes during shipment or storage, warm the product to and mix it well before use. Emergency Procedures Refer to the MSDS for detailed emergency procedures. Eye Contact Seek immediate medical attention. Flush the eyes with water for 15 m minutes. Skin Contact Remove all contaminated clothing. Wash the skin with soap and water. Seek medical attention. Inhalation Remove the person to an area with fresh air. Seek medical attention if necessary. Ingestion Seek immediate medical attention. Spill Dike the area to contain the spill. Refer to the MSDS for clean-up. Notify the proper authorities if required. *NOTE: Refer to the MSDS for detailed emergency medical procedures. Product Description & Shipping: DE 88 K Starter (ZB88) is a clear yellow liquid. The specific gravity is between 1.0 and 1.1 with a ph of 4 8. ZCl BRT II (ZB1010) is a clear liquid. The specific gravity is between 1.0 and 1.1 with a ph less than 6 Both products are available in 5 gallon containers and 55 gallon drums. WARRANTY AND DISCLAIMER Technical information and recommendations contained herein are believed to be reliable, however, the accuracy or completeness thereof is not guaranteed. No statement or recommendation shall constitute a representation unless set forth in an agreement in writing by the seller and manufacturer. NO WARRANTY OR MERCHANTABILITY OR WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE IS MADE. The following warranty is made in lieu of any other warranties, express, implied, or statutory. Products are warranted to be free from defects on material and workmanship at the time sold. The sole obligation of the seller and manufacturer under this warranty shall be to replace any product defective at the time sold. Under no circumstances shall the manufacturer or seller be liable for any loss, damage, expense, direct or consequential, arising out of the use of or inability to use the product. Materials shall not be returned to the seller or manufacturer without express written permission. No information or suggestions given by us shall be deemed to be a recommendation to use any product in conflict with any existing patent rights. Revision Date: 7/11/2018