MACDERMID INCORPORATED 245 FREIGHT ST. WATERBURY, CT USA 06702-9984 TEL (203) 575-5700 US FAX (203) 575-5630 INTERNATIONAL FAX (203) 575-7900
INCORPORATED
DU-ZINC 019 ACID CHLORIDE BRIGHTENER SYSTEM Product Code No. 73834
DESCRIPTION and FEATURES DU ZINC 019 is a versatile Acid Chloride Zinc Plating System which offers outstanding performance in both rack and barrel application. It may be used with all Potassium as well as with Potassium-Ammonium salts. Special Features •
Tolerant to high temperature operation up to 120°F
•
For Rack & Barrel operations
•
No oil out tendencies
•
Brightener components are free rinsing resulting in improved chromability
•
Free from and complexing agents
•
Simple two component system for easy bath control and maintenance.
TABLE OF SECTIONS 1. Physical Characteristics 2. Chemical Profile 3. Operating Standards 4. Solution Make Up 5. Plant Equipment 6. Solution Control 7. Operating Tips 8. Trouble Shooting 9. Safety & Warning 10. Waste Treatment 11. Order Information
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1. PHYSICAL CHARACTERISTICS DUZINC 019B
DUZINC 019W
Clear Colorless Liquid
Clear Amber Liquid
None
None
Complete
Complete
Low
Low
DUZINC 019B
DUZINC 019W
5.4-5.6
5.8-6.0
Phosphate
No
No
Biodegradable
No
Yes
Chelates
No
No
Attack on metals (steel, copper, brass or aluminum) at recommended operating conditions
No
No
None
None
Physical Appearance Flash Point Maximum Solubility Foaming Tendency
2. CHEMICAL PROFILE pH
Effect of water hardness
3. OPERATING STANDARDS Rack
Barrel
Zinc Metal
3.0-5.0 opg (22.5-37.5 g/L)
2.0-4.0 opg (15-30 g/L)
Total Chloride
18-21 opg (135-157.5 g/L)
16-20 opg (120-150 g/L)
Boric Acid
4.0-5.0 opg (30-37.5 g/L)
3.0-4.0 opg (22.5-30 g/L)
68-120° F (20-49 °C)
68-120° F (20-49° C)
4.8-5.6
5.2-6.0
2-9V
2-9V
Zinc Metal
3.0-5.0 opg (22.5-37.5 g/L)
2.0-4.0 opg (15-30 g/L)
Total Chloride*
18-21 opg (135-157.5 g/L)
16-20 opg (120-150 g/L)
All Potassium Bath
Temperature pH Voltage Mixed Bath
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Ammonium Chloride
4.0-8.0 opg (30-60 g/L)
4.0-8.0 opg (30-60 g/L)
Temperature
68-120 ° F (20-49 ° C)
68-120 ° F (20-49 ° C)
4.8-5.6
5.2-6.0
2-9V
2-9V
pH Voltage
4. SOLUTION MAKE-UP Rack
Barrel
Zinc Chloride
7.4 opg (55.5 g/L)
4.2 opg (31.5 g/L)
Potassium Chloride
30.0 opg (225 g/L)
35.0 opg (262.5 g/L)
Boric Acid
4.0 opg (30 g/L)
3.0 opg (22.5 g/L)
DuZinc 019 W
4% by vol.
4% by vol.
DuZinc 019 B
0.2% by vol.
0.2% by vol.
All Potassium Baths
Mixed Ammonium-Potassium Baths
Zinc Chloride
6.3 opg (47.25 g/L)
4.2 opg (31.5 g/L)
Potassium Chloride
24.0 opg (180 g/L)
24.0 opg (180 g/L)
Ammonium Chloride
6.0 opg (45 g/L)
6.0 opg (45 g/L)
DuZinc 019 W
4% by vol.
4% by vol.
DuZinc 019 B
0.2% by vol.
0.2% by vol.
Note: Prior to making a DuZinc 019 zinc plating bath, the process tank must be cleaned thoroughly for a minimum of 24 hours with 5% HCl. *Note: Total Chloride Range for Mixed Bath: 16-21 oz/gal of total chloride ion should be maintained depending on the zinc metal concentration. 16 oz/gal is recommended for zinc values of 1-3 oz/gal and 18-21 oz/gal is recommended for zinc values of 3 and over. The total chloride ion can be controlled by adding a mixture of 80% by weight potassium chloride and 20% by weight ammonium chloride. Two ounces per gallon of this mix will yield one ounce per gallon of chloride ion. If preferred, a premixed additive PAM chloride may be used to supply both chlorides in their proper ratio.
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5. PLANT EQUIPMENT
Continuous Filtration Agitation
Air or solution (recommended) Pure Zinc (99.99%)
Anodes Tanks
Hard rubber lined steel, PVC/polyester reinforced material, polyethylene or polypropylene
Heating/Cooling Exhaust
Teflon or titanium coils Recommended
6. SOLUTION CONTROL A.
Zinc Determination
1. Pipette a 2 mL sample into a clean 250 or 500 mL Erlenmeyer flask. Rinse down the inside of the flask with distilled water and dilute to about 75 to 100 mL. 2. Add about 10 mL of analytical grade Ammonium Hydroxide and a small pinch (about the volume of a large grain of rice) of Eriochrome Black T Indicator powder. 3. Titrate with 0.1 Molar Di-Sodium EDTA to an end point that changes from purple to a lasting pale blue color. mL x 0.434 = oz/gal zinc (as metal) B.
Total Chloride Determination
1. Pipette a 1.0 mL sample into a clean 500 ml Erlenmeyer flask. Rinse down the inside of the flask with distilled water and dilute to about 100 ml. 2. Add about 3-6 drops of 10% neutral Sodium Chromate Indicator Solution and titrate with 0.1 Normal Silver Nitrate to a reddish-buff endpoint mL x AgN03 x 0.473 = oz/gal total chloride ion C.
Boric Acid Determination
1. Pipette a 5 mL sample into a clean 500 ml Erlenmeyer flask. USE NO WATER. Slowly pour in as a rinsedown, about 10 mL of 100 g/L Potassium Ferrocyanide to precipitate the zinc. Add about 1 ml of Bromo Cresol Purple Solution and then add, with swirling, increments of dMannitol to make a slushy paste. 2. Titrate with 0.5 Normal Sodium Hydroxide to a blue endpoint ml x Normality x 0.825 = ox/gal boric acid
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7. OPERATING TIPS Potassium chloride used in making up and replenishing DuZinc 019 baths must not contain any harmful or organic additives. Only high purity grade zinc chloride should be used. DuZinc 019 baths replenished with low grade chemicals will not perform properly. DuZinc 019B (brightener) is consumed at the rate of 1 gal/20,000AH. DuZinc 019W (wetter) is only consumed by drag out. In barrel operations, the DuZinc 019 wetter to brightener replenishment additions should be maintained at 2:1 to1:1 while for rack applications, the DuZinc 019 wetter to brightener replenishment additions should be maintained at 1:3. Bath pH should be maintained between 4.8 and 6.0. Technical grade hydrochloric acid should be used to lower the pH and potassium and ammonium hydroxide should be used to increase the pH. The major contaminant in all chloride zinc plating baths is iron. This contamination is normally controlled by the use of air agitation along with solution filtration. Addition of 1 to 2 quarts of hydrogen peroxide per 1,000 gal to the plating tank is recommended to aid in the removal of soluble iron in the bath. Analyze the bath frequently so that it remains in chemical balance and avoid large addition of chemicals at any time to restore solution balance. Always analyze and adjust the zinc and chloride contents before adding DuZinc 019 brightener and wetter. PREPLATE TREATMENT
A general cleaning and pickling cycle is recommended as follows: 1. Hot alkaline soak clean; e.g., CLEPO 644-L 2. Hot alkaline electroclean (anodic); e.g., CLEPO 601 SXL 3. Rinse 4. Hydrochloric acid pickle 5. Rinse 6. Acid zinc plate Variations of this cycle are also available. Contact your Gumm representative for a survey of the line and optimization of the pretreatment cycle. POST PLATE TREATMENT DuZinc 019 deposits have excellent chromate receptivity. In order to ensure the highest corrosion resistance, the use of CLEPO PK-3 (blue bright trivalent chromate) or DuChrome 554-L (yellow) is recommended.
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8. TROUBLE SHOOTING TIPS FOR DUZINC 019 High Current density burning
Dull low & mild current deposit
Deposit roughness Stained, dark deposits after bright dipping
Misplated, blotched or mottled parts
White stains after plating and prior to chromating
1. 2. 3. 4.
Low makeup brightener or wetter Low Zinc metal content High chloride content Low boric acid concentration (all potassium baths) 5. Low temperature 1. Low brightener concentration 2. Low chloride content 3. Very high temperature 4. High zinc metal 5. High pH 1. Excessive anode sludge 2. Ripped anode bag 1. Iron contamination (treat with hydrogen peroxide) 2. Cu,Pb, Cd contamination (dummy bath of zinc dust treat) 3. Contaminated bright dip 1. Chromium contamination (treat with sodium hydrosulfite) 2. High maintenance brightener 3. Organic contamination (treat with activated carbon) 1. Poor rinsing after plating 2. Too long transfer time prior to rinsing, solution attacks plate.
9. SAFETY & WARNING: MacDermid, Inc. recommends that the company/operator read and review the MacDermid Material Safety Data Sheets for the appropriate health and safety warnings before use. Material Safety Data Sheets are available from MacDermid Incorporated.
10. WASTE TREATMENT Prior to using any recommendations or suggestions by MacDermid, Inc. for waste treatment, the user is required to know the appropriate local/state/federal regulations for on-site or off-site treatment which may require permits. If there is any conflict regarding our recommendations, local/state/federal regulations take precedent.
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11. ORDER INFORMATION Product
Product Code
Container
DUZINC 019B
73834
5 gal & 55 gal
DUZINC 019W
73837
5 gal & 55 gal 220 gal & 330 gal
Products may be ordered by calling: MacDermid Incorporated Industrial Products Division 1-800-325-4158
Also read carefully warning and safety information on the Material Safety Data Sheet. This data sheet contains technical information required for safe and economical operation of this product. READ IT THOROUGHLY PRIOR TO PRODUCT USE.Emergency directory assistance Chemtrec 1800-424-9300. DISCLAIMER: All statements, technical information and recommendations contained herein are based on tests we believe to be reliable, but the accuracy or completeness thereof is not guaranteed. No statement or recommendation shall constitute a representation unless set forth in an agreement signed by officers of 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 such warranties and all other warranties, express, implied, or statutory. Products are warranted to be free from defects in material and workmanship at the time sold. The sole obligation of seller and manufacturer under this warranty shall be to replace any product defective at the time sold. Under no circumstances shall manufacturer or seller be liable for any loss, damage or expense, direct or consequential, arising out of the inability to use the product. Notwithstanding the foregoing, if products are supplied in response to a customer request that specifies operating parameters beyond those stated above, or if products are used under conditions exceeding said parameters, the customer by acceptance or use thereof assumes all risk of product failure and of all direct, indirect and consequential damages that may result from use of the products under conditions, and agrees to exonerate, indemnify and hold harmless MacDermid Incorporated therefrom. No suggestion for product use nor anything contained herein shall be construed as a recommendation to use any product in infringement of any patent rights, and seller and manufacturer assume no responsibility or liability for any such infringement.
