ZN - 408
Cyanide Zinc Brightener

DESCRIPTION:

Triple-s 747 Cyanide Zinc brightener ZN-408 is a low cost brightener, which is suitable for most cyanide zinc baths, giving superior brightness and excellent throwing power. It has also more tolerance to organic impurities.

ADVANTAGES:

• Very bright deposit.
• Very stable, though in high bath temperature.
• Exceptional coverage and brightness in low current density.
• Can be used successfully in high, medium and low cyanide baths.
• Excellent receptivity of blue and gold chromatin.
• Very low cost brightener.
• Easy to operate and control.
• Packed in 5 gallon plastic containers or 55 gallon fiber drums.

This process requires no special equipment and may be operated in any presently used system for high cyanide or any other law cyanide baths.

ZINC METAL:

The zinc cyanide concentration of the bath should not drop below 1 oz./gallon which will result in a reduction in efficiency and may strip off in recess area during chromatin.

SODIUM CYANIDE:

A very low cyanide will diminish the brightness in high current areas. The cyanide content should never be allowed to drop below the zinc metal content.
Ratio of sodium cyanide to zinc should be 2.7 : 1

SODIUM HYDROXIDE:

A low sodium hydroxide content will decrease the conductivity of the bath with a thin deposit. Excessive caustic context will increase the viscosity, which will increase loss of solution through drag out.

ANODE PERFORMANCE:

High purity zinc anode should be used. Zinc anodes are responsible to build up the zinc content (zinc cyanide) of the bath. Insufficient zinc metal is indicated by very rough deposit on zinc anodes. The condition can be corrected by adding more zinc anodes to the bath and reducing steel anodes if any present in bath. Also the condition can be adjusted by adding zinc cyanide to the solution.

SODIUM CARBONATE:

Carbonate is formed during the operation of the cyanide zinc baths as a result of oxidation of cyanide and by reaction with carbon dioxide in the air.
Minimum sodium carbonate concentration should be 1 to 2 oz./gal. and maximum of 5 to 7 oz./gal.
High carbonate concentration will be precipitated by freezing of the solution to 40º - 45º F. in which the carbonate will crystallize.

MAINTENANCE OF SOLUTION:

This consumption of brightener is governed first by drag out and second by ampere hours. Barrel solutions with normal heavy drag out will result a consumption rates of 15,000 to 20,000 amp/hours per gallon of brightener.

IMPURITIES:

Impurities such as Copper, Cadmium and Led will cause a black deposit especially when the plate is bright dipped.

Triple-s Cyanide zinc purifier is very effective and will precipitate the impurities as insoluble sulfide.

Optimum poly-sulfide concentrations can be maintained by regulating purifier maintenance additions to give a positive (light brown) test on lead acetate impregnated test papers.

Organic impurities cause more problems and can be eliminated by activated carbon treatment with potassium permanganate (kMn04) amounting to 0.5 to 1 lbs. per 1,000 gallons of plating bath.

POST PLATE TREATMENT:

• Zinc plate.
• Cold water rinse.
• Nitric acid dip (0.5%) HNo3.
• Cold water rinse.
• Chormate (blue or iridite).
• Cold water rinse.
• Hot water rinse and dry.

CONVERSION OF EXISTING BATHS:

Triple-s 408 is compatible with most cyanide zinc plating systems on the market. For conversion, simply adjust the solution to the above composition then add required amount of ZN-408 Brightener. However, we suggest that you send us one gallon of solution as a sample for our laboratory to testing and further recommendation.

TOXICOLOGY:

The plating solution is highly hazardous, it may be fatal if swallowed or inhaled and will cause irritation to skin and eye on contact. It is recommended to avoid any physical contact and wearing chemical safety gloves, glasses and clean protective outer clothing. Provide adequate ventilation to prevent inhalation of vapor or solution spray.

SUGGESTED FIRST AIDS:

Plating solutions:

• In case of eye contact: Immediately flush eyes with plenty of water for at least 15 minutes and call a physician.
• For skin Contact: Wash with water for at least 15 minutes while removing contaminated clothing. Obtain medical attention.
• If swallowed: break an AMYL Nitrate pearl in a cloth and hold lightly under the nose for 15 seconds. If patient is conscious or when consciousness returns, give emetic (1 table spoon of salt to each glass of warm water and repeat until vomit fluid is clear.) Repeat inhalation of AMYL Nitrate five times at above 15 seconds intervals, use artificial respiration if breathing has stopped!
• Get immediate Medical Attention!

The information stated herein is based on information and tests we believe to be reliable. The accuracy or completeness thereof is not guaranteed. Since conditions of use are outside our control, user shall, before using, determine the suitability of the product for his intended use and user assumes all risk and liability in connection therewith.