Plastic electroplating palladium activator

Plastic electroplating palladium activator

Plastic electroplating colloidal palladium activation process (palladium water)

1. Overview

Palladium water is an acidic activator, mixed with hydrochloric acid . It is designed for plastic electroplating. This activator is very stable and has a long service life.

4.Control and maintenance

Palladium water   control range: 4-8 ml/liter

(A) preparation . 4 ml / l standard colorimetric working solution

Take 20 ml of analytically pure hydrochloric acid in 100 ml colorimetric tube was then added 0.4 mL of palladium water mixed volume to 100 ml , and shaken .

(B) formulated . 6 ml / l standard colorimetric working solution

Take 20 ml of analytically pure hydrochloric acid in 100 ml colorimetric tube was then added 0.6 mL of palladium water mixed volume to 100 ml , and shaken .

(C) formulation . 8 ml / l standard colorimetric working solution

Take 20 ml of analytically pure hydrochloric acid in 100 ml colorimetric tube was then added 0.8 mL of palladium water mixed volume to 100 ml , and shaken .

(D) Standard concentration detection

(1) directly take the tank liquid and pour it into the empty colorimetric tube to compare the color with the above standard colorimetric working solution.

(2) Compare the color with various standard solutions to judge the palladium water concentration of the working bath solution.

When necessary, add palladium water to maintain its concentration between 4-8 ml/liter.

Change the color standard liquid every week.

If you want to get more accurate results, you can use a spectrophotometer, colorimeter, etc.

Divalent tin Control range: 3.0-3.5 g/l

When necessary, add stannous chloride to maintain the divalent tin content in the working fluid between 3.0-3.5 g/l.

hydrochloric control range: 2 . 5 0-2 . 8 0 ml / l  

Analytical method :

( 1 ) Use a pipette to draw 2 ml of bath liquid into a 250 ml Erlenmeyer flask.

( 2 ) Add about 50 ml of pure water.

( 3 ) Add phenolic phenol indicator.

( 4 ) In 0.2N sodium hydroxide solution titrated to a red end point .  

Calculation : Hydrochloric acid (ml/L ) = 41.44 × sodium hydroxide consumption (ml) × sodium hydroxide concentration (N)

When necessary, add analytical pure hydrochloric acid to maintain the hydrochloric acid content in the working solution between 250-280 ml/l

Impurities

The tolerance of the bath liquid to impurity pollution is: Fe: <100ppm, Cr: <100ppm, nitrate and sulfur: <5ppm

Iron ions, nitrate and sulfur: Mainly derived from impure hydrochloric acid , which will cause degelling.

Chromium ion: Mainly comes from incomplete neutralization, which will lead to skip plating and abnormal consumption of divalent tin.

Note: When there is no impurity pollution, it does not need to be eliminated and can be used continuously, but when the plated parts fall, they must be picked up in time.

5.Troubleshooting