Laton Atotech
Laton Atotech
Laton Atotech
Version: 02
SUPERVISION
Doc.-No.: 2047
IMDS-No.: not relevant
CONTENTS
Process Information...........................................................................................................................................2
Practical Test with the Hull Cell .........................................................................................................................3
1. Influence of the Concentration of Brass Trisalyt .......................................................................................3
1.1 Normal Concentration ..........................................................................................................................3
1.2 Concentration is too low .......................................................................................................................3
1.3 Concentration is too high......................................................................................................................3
2. Influence of the Constituents.....................................................................................................................4
2.1 Copper..................................................................................................................................................4
2.2 Zinc .......................................................................................................................................................4
2.3 Sodium Cyanide (free) .........................................................................................................................4
2.4 Sodium Carbonate ...............................................................................................................................4
2.5 Ammonium Chloride .............................................................................................................................4
2.6 Ammonia ..............................................................................................................................................4
3. Influence of the pH-Value..........................................................................................................................5
4. Organic Contaminations............................................................................................................................5
Typical Test Panel for Brass Trisalyt .................................................................................................................6
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Doc.-No.: 2047
Process Information
Content of copper
Content of zinc
Content of cyanide (free)
Content of carbonate
Nominal values
Copper
Zinc
Sodium cyanide (free)
Sodium carbonate
On Make up
During operation
12.9 g/l
6.0 g/l
9.4 g/l
approx. 20.0 g/l
10 - 18 g/l
5 - 8 g/l
7 - 15 g/l
below 100 g/l
Suitable methods for analyses are described in our "Analytical Instructions for Brass solutions".
The pH-value should be between 9.4 and 10.0 (measured Lyphan-Paper) ( Range: 9.4 - 10.3).
If the total concentration of the electrolyte decreases, e.g. due to drag-out, it can be restored by adding
Brass Trisalyt Compound Part A and Brass Trisalyt Compound Part B.
For each 10 g of Brass Trisalyt Compound Part A added, add 6 g Brass Trisalyt Compound Part B at
the same time.
If only the copper content or zinc content need to be adjusted, copper cyanide (CuCN) or zinc cyanide
(Zn(CN)2) should be added.
Additions of 10 g/l each of the following salts will change the inorganic bath values as follows:
Salt
10 g/l Brass Trisalyt
Compound Part A
10 g/l Copper cyanide
(CuCN)
10 g/l Zinc cyanide
( Zn(CN)2 )
Copper
2.0 g/l
Zinc
0.95 g/l
7.1 g/l
--
-10.9 g/l
--
5.6 g/l
-8.4 g/l
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Doc.-No.: 2047
In order to increase the content of inorganic components by 1 g/l the following amounts should be
added:
Salt
4.9 g/l Brass Trisalyt
Compound Part A
10.6 g/l Brass Trisalyt
Compound Part A
6.7 g/l Brass Trisalyt
Compound Part A
1.4 g/l Copper cyanide
(CuCN)
1.8 g/l Zinc cyanide
( Zn(CN)2 )
Copper
1 g/l
Zinc
0.5 g/l
2.2 g/l
1 g/l
+1.6 g/l
1.4 g/l
0.6 g/l
+1 g/l
1 g/l
--
-1.5 g/l
--
1 g/l
-1.5 g/l
Copper
Zinc
Sodium cyanide
Sodium carbonate
Ammonium chloride and
Ammonia
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2.2 Zinc
Lack of zinc leads to reddish brass layers in the highest current density range.
An excess of zinc leads to unsightly coloured deposits (greyish, beige), mainly in the high current density
area.
2.6 Ammonia
If the electrolyte lacks ammonia, the layers are have a brownish colour mainly at high current densities.
(Fig.5) For correction 1 to 2 ml/l ammonia (0.91 g/cm3) must be added.
At first an excess of ammonia shows reddish brass deposits over the entire current density area. If there is a
strong overdosage mainly zinc will be deposited in the high current density range. Zinc deposition can
spread over the entire front of the test panel (Fig. 6). An excess of ammonia can be completely reduced by
temporary heating of the bath to 60 - 80 C.
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4. Organic Contaminations
Brass deposits which are reddish, matte or striped at a normal pH and correct bath composition result from
organic contaminations (foreign wetting agents or other organic substances). To remove the foreign
substances clean the bath with 4 - 5 g/l powdered activated carbon (low sulfur, low iron; suitable carbon can
be purchased from Atotech).
Be sure to observe all local regulations concerning the limit values of pollutants
including the general regulations on dangerous materials!!
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100 mm
Abb.1
Normal concentration
Abb.2
Total concentration is too low
Abb. 3
Lack of sodium cyanide
(free) (3 g/l)
Abb.4
Lack of ammonium chloride
(0.5 g/l)
Abb.5
Lack of ammonia
Abb.6
Excess of ammonia
(approx. 25 ml/l)
Abb.7
pH 12
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.
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