Adhemax Neutralizer Cr Ds v3

DIRECT PLATING

DATA SHEET

Adhemax® Neutralizer CrProtects the Adhemax® Activator SF and Adhemax® Activator NA from oxidation caused by drag-in of hexavalent chromium

Version: 03

Doc.-No.: 2161

SAP-No.: 1677815

IMDS-No.: not applicable

CONTENTS

1. Process Information............................................................................................................................... 22. Equipment............................................................................................................................................. 23. Make-Up................................................................................................................................................ 24. Working Parameters.............................................................................................................................. 35. Maintenance.......................................................................................................................................... 36. Correction Instructions........................................................................................................................... 47. SAP No. for Make-Up and Maintenance Products.................................................................................48. Recommendations for Wastewater Treatment......................................................................................59. Analytical Instructions............................................................................................................................ 7

Determination of Adhemax Neutralizer Cr by Titration......................................................................7

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Released on: Released by:

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Doc.-No.: 2161

1. Process Information

Adhemax® Neutralizer Cr is based on a hydroxylamine compound.

Adhemax® Neutralizer Cr protects the subsequent process steps – especially the Adhemax® Activator SF and Adhemax® Activator NA - from drag-in of hexavalent chromium and sulfite and therefore increases their stability and lifetime.

Compared to other reducing agents, the drag-in of Adhemax® Neutralizer Cr into the Adhemax® Activator SF and Adhemax® Activator NA is less critical.

2. Equipment

Tanks Polyethylene, polypropylene, PVC

Heaters Glass, porcelain, PTFE (only needed in the winter in unheated rooms)

Exhaust Recommended.

Agitation Not required, however recommended (mechanically or by pumps)

Filtration Not required.

3. Make-Up

Make-Up of 100 l Liter kg

Water, deionized 95.0 ---Adhemax® Neutralizer Cr 5.0 5.5

Fill the tank with the required amount of deionized water. Add the Adhemax® Neutralizer Cr while stirring.

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In all work with Adhemax® Neutralizer Cr, make sure that all regulations on operations with aqueous hydroxylamine solutions are carefully observed.

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4. Working Parameters

Temperature 25 °C (20 – 30 °C)

Treatment Time 1 min (1/2 – 2 min)

pH About 4, cannot be used for monitoring the bath

Density About 1, cannot be used for monitoring the bath

5. Maintenance

A special maintenance is not necessary. However, as soon as the color of the solution turns yellow, which is an indication of hexavalent chromium impurities in the bath, a new make up must be carried out.

Generally, a new make up becomes necessary after a throughput of about 2 m2 surface per Liter bath. If the reducer is used as described, the color of the solution will change from yellow to green during mixing the reducer with chromium(VI)-containing solutions which corresponds to the reduction of hexavalent chromium to trivalent chromium.

Evaporation and drag-out losses must be replenished with a 5 % solution of Adhemax® Neutralizer Cr.

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6. Correction Instructions

Process solution Component Working Window Lack of component

Excess of component

Adhemax® Neutralizer Cr

Adhemax® Neutralizer Cr

40 – 60 ml/l Drag in of Cr-VI into the rest of the pre-treatment line/ precipitation of the Activator / skip plating

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7. SAP No. for Make-Up and Maintenance Products

PRODUCT SAP No.

ADHEMAX NEUTRALIZER CR 1680554

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8. Recommendations for Wastewater Treatment

This product contains complexing agents and therefore cannot be sent to the general circulation of rinse water. The wastewater generated by this product must therefore be treated separately.A mixing with Ni-containing waste waters has to be avoided.

Rinse water

Rinse water (1 : 100) can be sent directly to the acidic/alkaline wastewater system for common precipitation at pH 8.5 – 9.5 and neutralization with the use of calcium hydroxide and caustic soda.

Concentrates and higher concentrated Rinse water

Concentrates, also in presence of Ni-ions, should be diluted with the rinse water in the ratio of at least 1 : 3 before sending to the wastewater treatment plant and can then be treated by adding Sediganth C at a pH of 4 - 10.

Indication of complete precipitation can be obtained potentiometrically. The amount ofSediganth C (approx. 8 – 12 ml per 1 g heavy metal) has to be determined by a prior test (as described below.)

Then adjust the pH to 10 with calcium hydroxide to precipitate also the included chromium.

For better flocculation add flocculation agent (we recommend polyacryl amide/anionic with a mol mass of 4 – 6 million) and stir. Allow the precipitate to settle for better filtration.

After filtration is complete the filtrate must not be mixed with metal ions bearing waste streams.

After a reaction time of about 30 min. the solution will be filtered over a special filter press.

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To determine the required amount of precipitation agent

0.1 ml precipitation agent Sediganth C is added to 100 ml of rinse water sample at a pH of 4 - 10, being continuously stirred. After a reaction time (while the solution is stirred) of 5 min., the solution to be treated has to be clear

and colorless. When another 0.1 ml precipitation agent Sediganth C is added no further clouding should appear.

The resulting ml of precipitation agent Sediganth C for 100 ml rinse water sample gives the amount of precipitation agent in liter for 100 l rinse water to be treated.

IMPORTANT NOTE: Be sure to observe all local regulations concerning the limiting values of pollutants including the general regulations on dangerous materials!

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9. Analytical Instructions

Determination of Adhemax Neutralizer Cr by TitrationVersion: 02

Doc.-No.: EXT-0785-TIT-02

Principle: Redox titration

Reagents required*:

Sulfuric acid 2.5 M Ammonium iron(III)-sulfate solution 0.4 mol/l (193 g NH4Fe(SO4)2 x 12 H2O are mixed with 100 ml

Sulfuric acid 2.5 M and diluted by addition of 500 ml DI water while stirring thoroughly. Then fill up to 1 liter with DI water and mix thoroughly.)

0.1N Potassium permanganate volumetric solution Phosphoric acid, 85 %

Be sure to observe all local regulations concerning the permitted limits for pollutants, including the general regulations for hazardous materials!

Equipment required:

Analysis scale 500 ml Erlenmeyer flask

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Procedure:

Place 5.0 ml** sample into a 500 ml Erlenmeyer flask and dilute with 50 ml DI water, and mix with 10 ml Ammonium iron-III-sulfate solution and 10 ml 2.5 M Sulfuric acid. Then bring the sample to the boiling point. After keeping the solution at

boiling point for 5 minutes, fill up to 250 ml with DI water and add 2 ml Phosphoric acid (solution gets clear). Heat up the solution to 60 °C and titrate with Potassium permanganate volumetric solution 0.1 N from clear to weak red/violett.

Calculation:

Consumption Potassium permanganate 0.1 N x 3.76*** = ml/l Adhemax Neutralizer Cr

Quality assurance: For maintenance, calibration of measuring devices and the use of standards and reference materials please refer to the corresponding guidelines.

* Unless otherwise stated, these are always analytical grade substances.** Volumes given exact to a decimal point must be measured with a volumetric pipette.*** For the purpose of calculation, the factor of the standard solution is assumed to be 1.000 and is

therefore not taken into account in the examples.This sheet shall serve for your information. The content of the sheet is based on our best knowledge. We do not undertake any duty to advise. The contents of the sheet shall not be considered as an agreement on condition and quality of the goods delivered.The decision to use our products for its production purposes is the responsibility of our customer. We can accept liability only for the quality of our products at delivery. If difficulties arise in the application of our products, we propose that you contact our technical service department.

Atotech Deutschland GmbH P.O. Box: 21 07 80

10507 Berlin, Germany Erasmusstraße 20

10553 Berlin, Germanyphone +49 (0) 30 349 85 0fax +49 (0) 30 349 85 777

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Adhemax Neutralizer Cr Ds v3

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