METASU FZ-77A1(M) / FZ-77GC1(M)

Zinc plating brightener system for high temperature chloride bath

The prevention of greenhouse effects caused by carbon dioxide produced from systems that derive energy from burning fossil fuels, and environmental topics like the reduction of industrial waste have become worldwide issues.
METASU FZ-77, a zinc plating brightener system for high temperature acid baths, was developed to mitigate these issues.
Usable at high bath temperatures (30 to 45℃), this system needs less power for cooling, leading to an energy-efficient system and lower electricity costs. Also, the system prevents plating solution volume increases caused by cooling, and this reduces the amount of industrial waste.

• Suitable for a wide selection of plating baths, an attractive shiny plated film can be obtained  over a wide range of bath temperatures ranging from 20 - 60℃. However, an operating    range of 30 - 45℃ is recommended for the brightener to display its true performance and   merits on the production floor.
A plating bath with a higher temperature has the following merits.
(1) Processing can continue without having to cool down the plating solution.
(2) There is no increase in the plating solution.
(3) Productivity is improved due to a higher electrical conductivity during plating.
(4) Prevents chipping, and physical properties of the plated film are improved, providing    excellent ductility for secondary processing.
(5) Chromate adhesion is improved compared to conventional systems.
• Can be used for all ammonium baths and ammonium-potassium (1:1 ratio) baths.
• Pleasant work environment due to reduced mist and odor.

Product Specifications


Appearance Brown liquid (FZ-77A1(M))
Brown liquid (FZ-77GC1(M))

*The product color tone does not affect performance.


Usage conditions (standard)

Item Monitoring range Remarks
Composition Zinc chloride 30 – 50g/L Monitor by analysis.
Zinc metal 15 – 25g/L Monitor by analysis.
All chlorines 130 – 170g/L Monitor by analysis. Decrease in concentration induces a drop in covering power.
METASU FZ-77A1(M) 0.03 – 0.06L/KAH Set according to the barrel drag-out amount.
METASU FZ-77GC1(M) 0.03 – 0.10L/KAH Consumption amount increases in high temperature baths.
Condition pH 5.7 – 6.1 Monitor by pH meter.
Bath temperature 20 – 60°C Consumption amount for GC1A (brightener) increases in high temperature baths.
Cathode electric current density 2.0 – 4.0 A/dm2 Electric current is set according to the shape and quantity of the parts for plating.
Anode High purity zinc (99.99%) Titanium case can be used.
Filtration Continuous filtration A filtration capacity of 2 to 4 times the amount of plating solution per hour is required.

Bath makeup method (standard)

Chemicals Ammonium bath Ammonium-potassium bath Remarks
Zinc chloride 40g/L 40g/L 99% high purity product
Ammonium chloride 200g/L 50g/L For industrial or food additive use.
Potassium chloride 150g/L Refined product.
METASU FZ-77A1(M) 20ml/L 20ml/L Brightener for bath makeup and replenishment.
METASU FZ-77GC1(M) 0.3 – 1ml/L 0.3 – 1ml/L Brightener for bath makeup and replenishment.

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