Barrel galvanizing main light agent

This process is not containing the CN - and novel alkaline chelating agent of the barrel plating process. It provides a number of advantages for the user, including coating formation, it is a good zinc utilization, easy to operate, and tolerance for the burnt plating layer.

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Product Description

Barrel galvanizing main light agent

Environmental protection barrel galvanizing brightener

Production number: 5101 3

Description and characteristics

This process is not containing the CN - and novel alkaline chelating agent of the barrel plating process. It provides a number of advantages for the user, including coating formation, it is a good zinc utilization, easy to operate, and tolerance for the burnt plating layer.


lGood throwing power

lSimple wastewater treatment operation

lWide operating range

lGood coating dispersion

lCan operate in a wide current range

lSingle component operation

table of Contents

1.  Operating standard

2.  Build a bath

3.  Maintenance ingredients

4.  equipment

5.  Tank fluid maintenance

6.  Zinc supplement

7.  caveat

8.  Wastewater treatment



Standard value


8 -15g/l 

1 0 g/l



1 35 g/l




Maintenance brightener


base on needs


20-40 ℃

28 ℃

Cathode current


Anode current



Build a bath

Tank preparation

Tank used to with either a cleaning solution prepared in advance. In addition, if a new tank is used, it needs to be soaked in hot 10% NaOH solution.

The amount needed to build a bath



Standard value


8 -15g/l

1 0 g/l



1 3 5g/l







Maintenance brightener



Wetting agent



Method I :

To build a bath with zinc and NaOH :           

1. Ventilate the tank

2. Add cold water about half of the working tank volume

3. Add high-quality NaOH to the tank. According to the operating volume of the tank, use about 120g/L of NaOH . The tank will become very hot and if no ventilation equipment is provided, it will be choked by alkaline gas.

Note: When NaOH dissolves, it releases heat. On a large area of liquid surface, while stirring well, slowly add NaOH to avoid boiling or splashing of the solution.

4. Put as many steel baskets with zinc balls as possible into the tank.

5. Keep the temperature of the tank above 32 ℃ . In cold solutions, the dissolution step is very slow. Allow the tank to work for 16-24 hours, or until the zinc concentration reaches the required concentration (according to the working volume of the tank).

6. Determine the amount of starter agent and maintenance brightener based on the amount of the above added substances and the 2.5% volume ratio adjuster . Determine the amount of ARP scavenger or other adjustments required according to the Hastelloy cell test .

7. Add the solution to the working volume and adjust the temperature to the range of 21-35 ℃.

Method II :

More cost but easier and faster

Use zinc concentrate

1.Fill 1/2 tank volume with water . From Table 1 , determine the amount of NaOH required . Under stirring, slowly add high purity NaOH to the tank .

Note: When NaOH dissolves, it will release heat. On a large area of liquid surface, while stirring well, slowly add NaOH to avoid boiling or splashing of the solution.

2.Under good stirring, add 10-20% by volume of zinc concentrate ( depending on the required zinc concentration ) .

3.Add water to the operating level and mix well

4.The addition amount of the above substance and 2 .5 % to adjust the volume of the agent, the decision bath agent and maintenance of brightener. Determine the amount of ARP scavenger or other adjustments required according to the Hastelloy cell test .

5.Add the solution to the working volume and adjust the temperature to the range of 21-35 ℃.

Tank fluid maintenance

Zinc Titration


Wool chrome black T  indicator

0.1 M EDTA

Zinc buffer solution ( 50 g/L ammonium chloride +130ml/l ammonia) 

1L  water


1.  Pipette 2ml working sample solution into a 250ml conical flask

2.  Add 50ml pure water

3.  Add 10ml zinc buffer solution

4.  Add about 1g wool chrome black T  indicator, the solution turns purple.

5.  Use 0.1M EDTA to quickly titrate to the blue end point.


Zinc metal ( oz/gal ) = ( mls 0.1M EDTA ) × 0.434

Zinc metal ( g/l ) = ( mls 0.1M EDTA ) × 3.255

The zinc concentration can be controlled by increasing or decreasing the area of the zinc anode, and chemical dissolution is used to increase or reduce the zinc concentration.

Bath analysis: NaOH

There are two methods for reporting NaOH . Since the, involving more than NaOH concentration, it is necessary to know the amount of dissolved zinc, and the total, this solution involves NaOH total. Usually the total alkali concentration will be mentioned in the operating parameters section and can be used for analysis wherever possible. Moreover, this process requires the use of CN- , which should not be feasible. In these cases, the free alkali method can be used instead. Both analysis steps are listed below.

Total NaOH  (a more feasible method)

Try Liu

10% bv NaCN

Azo  purple indicator ( t- nitrobenzene resorcinol) -Dissolve 10 grams in 100mls of absolute alcohol.

1.0 N HCl


1.  Draw 5ml sample

2.  Add 10mls  NaCN solution

3.  Add 10 drops of Azo purple indicator

4.  Titrate with 1.0N HCl . The end point can change from dark yellow to purple.


mls 1.0 HCL × 1.07 = total NaCN ( opg )

Free NaOH analysis:


Sulfo Orange, Golden Lotus Orange O , or Azo  Purple Indicator

0.5N HCl


1.  Pipette 5ml sample into a 250ml conical flask

2.  Add 8 drops of indicator

(Range is 11.0-12.6 ) indicator, solution color is yellow, blue / purple

3.  Titrate with 0.5N HCl to the yellow endpoint


Free NaOH ( oz/gal ) = mls 0.5N HCl × 0.535

The total NaOH concentration can pass through the free NaOH concentration and the concentration of zinc metal commissure estimated.

Brightener supplement

The adding rate of maintenance brightener is : 150-250ml/KAH

Tank fluid maintenance

There are two options:

1.  Hang the traditional medium carbon steel "anode" basket (containing ordinary zinc balls) in the tank. For convenience, these should be hung on the anode rod, but insulated. The number of baskets required should be carefully adjusted to keep the zinc concentration within an acceptable range.

These baskets should be removed during a longer downtime. This system works well on small devices, but if applicable

For large equipment, it becomes more difficult.

2.  For large equipment, a separate zinc "dissolution tank" is recommended. It should be installed, it comes from the return weir of the plating tank

The solution will flow into the "dissolving tank", which should contain a steel basket with ordinary zinc balls (should ensure that there is enough zinc solution

Contact with steel). Then pump the solution out, it is recommended to pass a filter device, and then into the plating tank. The area of zinc should be adjusted,

Until the concentration remains the same. Only when zinc is electroplated, the solution circulation operation is performed. During the shutdown period, generally not

The zinc needs to be removed.


For health reasons, Bigley recommends that customers / users refer to Bigley's material data sheet before use .

Material information can be obtained from Bigley .

skin contact

If any liquid or solid comes into contact with the skin, it should be rinsed immediately with plenty of water or running, clean, cold water. Any pollution caused by clothing should be rinsed with water and then quickly processed.

eye contact

Wash your eyes with sterile saline or clean water for at least 20 minutes, and use a spray-type eye wash bottle. Please contact the doctor immediately.


Try to avoid vomiting. Keep the patient quiet, take a large amount of water acidified with lemon juice or vinegar ( 5% acetic acid) and seek medical attention immediately.

Wastewater treatment

Before treating wastewater in accordance with Bigley’s recommendations for wastewater treatment, users should understand the local laws and regulations on wastewater treatment inside and outside the factory.

Relevant provisions of management methods. If our suggestions conflict with laws and regulations, the local laws and regulations shall prevail.

Ordering information


Product number


Alkaline zinc plating regulator



Alkaline zinc plating opener



Alkaline zinc plating maintenance brightener (barrel plating)



Alkaline zinc plating wetting agent




In the TDS in any given relevant provisions of health, are generally advisory in nature, any use of personnel of the Bi Gelai should obtain relevant technical service personnel MSDS , MSDS have a more detailed specification information .

All the contents specified in this TDS are for reference / guidance, and users should adjust them according to their actual operating conditions .

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