Chemical Etchants of Tungsten Points

1. The chemical etchants of silver tungsten points, tungsten copper points, tungsten points, silver-nickel points, tungsten, copper and nickel points and other points are:
Ammonia                            50ml
Or hydrogen peroxide solution (30%)      10-30ml.
Use of points as follows: using a freshly prepared solution to wipe the surface of the points about 10 seconds.

2. The chemical etchants of tungsten, nickel or tungsten carbide particles in silver-nickel points, copper tungsten points, silver tungsten points, silver tungsten carbide points are: potassium ferricyanide mixture, among them,
A. NaOH(KOH)    10g         water     90ml
B. K₃[Fe(CN)₆]     10g         water     90ml
Use of points as follows: mixing A and B, and wiping the surface of the points.

3. The chemical etchants of tungsten particles in copper tungsten points and silver tungsten points are: hydrochloric acid solution and potassium ferricyanide mixture, among them,
A. NaOH(KOH)    10g    Water 90ml
B. K₃[Fe(CN)₆]     30g    Water 70ml
Use of points as follows: mixing A and B, and wiping the surface of the points.

4. The chemical etchants of pure copper, copper alloy are: hydrochloric acid solution and ferric chloride, among them,
Ferric chloride                    5g
Water                           50ml
Hydrochloric acid (concentrated)     50ml
Use of points as follows: wiping.

5. The chemical etchants of pure silver, copper graphite are: ferric chloride solution, among them,
Ferric chloride                    10g
Water                           50ml
Use of points as follows: wiping.

 

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