TRIVALENT Blue Passivation for Alkaline and Acid Zinc Plating process

                      

                TRIPASS BL 100

                    Cr3 Blue Passivation for                                   Alkaline and Acid Zinc 

                      Plating process

Introduction: 

❖

TRIPASS BL100 is a single component liquid Trivalent Blue passivation for Zinc plating 

process. It is completely free from Hexavalent Chrome.

❖

TRIPASS BL 100 provide a thin film passivate layer on both Alkaline and Chloride Zinc 

deposits. Excellent decorative effect.

❖

TRIPASS BL 100 is easy to operate and control and highly suitable for both Rack and Barrel 

Automatic and manual plating process.

❖

TRIPASS BL 100 film can be further enhanced with the application of the post applied Sealer 

or Topcoats. Which improve functional properties such as Corrosion resistance and 

Coefficient of Friction. 

Features:

❖

Completely hexavalent chrome free.

❖

Excellent receptivity on alkaline and chloride zinc electroplating deposits.

❖

Specially formulated for rack and barrel applications.

❖

Produces films with an attractive BLUE finish.

❖

Good corrosion resistance with / without Topcoat.

❖

Easy waste water treatment.

Corrosion Resistance: 

Electroplated 

Layer

Topcoat

Application

Corrosion 

Resistance

Zinc 8 – 12 µ

Without

Rack

72 Hrs. WR

Barrel

48 Hrs. WR

Rack / Barrel

240 Hrs. RR

With

Rack

144 Hrs. WR

Barrel

120 Hrs. WR

Rack/Barrel

336 Hrs. RR

❖ During the corrosion resistance test, in order to fully harden the film, please leave it for at 

least 24 hours.

❖ Corrosion resistance according to ASTM B117. The actual performance is depending on the

plated parts and operating conditions and may largely vary

Operating Conditions:

Particulars

Specification

Optimum

TRIPASS BL 100 

40 - 80 ml/ltr

60 ml/ltr

Nitric Acid 65%

0.25 – 0.75 ml/ltr

0.5 ml/ltr

Temperature

23 – 30⁰C

25⁰C

Immersion Time

20 – 60 Sec.

40 Sec.

pH Value @25⁰C

1.8 – 2.4

2.0

Agitation (Rack)

Uniform light air agitation

Agitation (Barrel)

Sufficient barrel rotation

Make Up of TRIPASS BL 100 :

Make up quantity for 100 Ltr. Bath

Particulars

Quantity

D M Water

94 Ltr.

TRIPASS BL 100

6 Ltr.

Make -Up Procedure:

❖

Fill up the passivation bath 2/3rd with D M water. 

❖

With continuous agitation add required amount of the TRIPASS BL 100. 

❖

Maintain the bath operating level through remaining D M Water.

❖

Check the pH value, In case not in within the range maintain with 50% v/v diluted Nitric 

Acid or Sodium Hydroxide (10% Solution)

❖ For makeup and maintenance of the passivation no circulation water from ion exchangers 

should be used since the water may contain surfactants or other impurities

The passivation bath is ready for the production.

Replenishment:

Consumption of ISOPASS TB 100 for 100 m2 

Product Name

TRIPASS BL 100

Quantity

1.0 to 1.5 Ltr.

❖

The above consumption is an estimate based upon film formation and drag-out. Actual 

replenishment will depend upon rack vs barrel and components geometry, etc.

❖ An alternative approach to replenishing the bath chemistry is to analyze for the Cr3+ 

Concentration by Atomic Absorption Spectrophotometer (AAS) or by Titration. Contact the 

Galvanotech Technical Service representative.

❖

Check the concentration of the passivation bath solution in each shift by titration.

Impurity limits: 

Fe 150 PPM, Zinc - 12 GM/LTR. Copper - 5 PPM, Lead - 5 PPM

Renewal of the passivation bath solution: As per the experience the bath renewal should be 

after about 500 dm2 /ltr operation.

Equipment:

❖ Tank: PVC, Polyethylene, Polypropylene, or Rubber lined steel tanks are suitable for use 

with ISOPASS TB 100 solutions.

❖ Heating: A heater is necessary to maintain the temperature during winter time. Ceramic 

bath heater, spirals or heating elements made of Teflon, PVDF or plastic coated steel can be 

used. It is not necessarily required to work with an automatic temperature control.

❖ Agitation: The light uniform air agitation required for the rack application for a constant 

colour and optimum brightness. The agitation coil should be acid resistance.

Temperature:

❖ Maintain the temperature within the range as specified in the table. Below 20⁰C the 

passivation slow reactive and irregular finish, Creating colorless surface that becomes matt 

and Hazy.

❖ Temperature to be control within the range to avoid variation in the passivation layer and 

aesthetic finish.

PH Value:

❖ Maintain the pH Value within the range as specified in the table. Low pH will increase the 

reactivity of the passivation and strip out the zinc. Higher pH slow down reactivity and will 

resulted the irregular finish.

❖ pH correction must be made with: To decrease the pH value use 50% diluted Nitric Acid 

(HNO3 LR). To increase the pH value use Sodium Hydroxide (10% w/v solution)

❖ Frequently check the pH value at least within 2 – 3 working hrs.

Dipping Time:

❖ The dipping time includes the duration of travel time from passivation bath to first rinse. It 

is due to the reaction of the passivation solution continue on the plated surface before 

dipped in to the rinse.

❖ At the time of freshly make up the passivation bath solution. Decrease the dipping time 5

to 10 second and gradually increase the time.

Process Sequence:

1. Zinc Plating (Alkaline / Chloride)

2. D M Water Rinse 

3. Activation (0.5% - 1% HNO3) 

4. D M Water Rinse 

5. TRIPASS BL 100

6. D M Water Rinse 

7. Hot D M Water Rinse 

8. Air Dry Oven 

9. Dry (70 - 80⁰C)

Waste Disposal: 

The preparation, maintenance, and disposal of TRIPASS BL100 solutions require the handling 

of concentrated trivalent chrome containing chemicals. Additionally, concentrated alkali 

and/or acid may be required for pH adjustment purposes. Avoid contact with the skin and 

eyes. Wear protective clothing and safety gear. In the event of any contact, flush affected area 

with a large volume of cold water and contact a physician, if necessary.

Handling and First Aid:

❖ TRIPASS BL 100 is acidic in nature, which is corrosive to skin and eyes. To avoid skin and eye 

contact. it is essential to wear goggles, gloves and protective clothing.

❖ After contact with skin, take off immediately all contaminated clothing, and wash immediately 

with plenty of water. After contact with skin, wash immediately with plenty of water. In case 

of contact with eyes, rinse immediately with plenty of water and seek medical advice. If 

swallowed, seek medical advice immediately and show container or label.

Storage:

ISOPASS TB 100 is an acidic solution that does not require any special storage considerations. 

but proper inventory rotation is still recommended. TRIPASS BL 100 is not combustible.

Shelf Life:

The shelf life of the product is two year from the date of manufacturing.

Product Information: 

Product Number

Product Name

Specific Gravity

FG 0080

TRIPASS BL 100

1.07 – 1.09 @25⁰C

Disclaimer of responsibility:

The data set forth in this bulletin is believed by SURCURE TECHNOLOGY to be true, accurate, and complete, but is not guaranteed. 

Our sole warranty is as stated in our Standard Terms and Conditions of Sale. We cannot warrant that our customers will 

achieve the same results from any process, chemical or product described in this bulletin because we do not have control 

over the conditions of use; nor can we assume any responsibility for our customer's use of any of our products in a 

manner which infringes the patents of third parties.