Acid Potassium Chloride Zinc Electroplating Brightener

Additives play an important role in plating solution. In general, additives are added according to KA.h consumption. If the proportion is out of proportion, add it according to the bath volume after adjusting by hull bath experiment. Without additive plating solution, the coating is gray and rough, and the range of cathode current density is very small. After adding appropriate amount of additives, the coating can be fine and bright, the current density is expanded, the dispersion ability and covering ability are improved, too high additives will cause brittleness of the coating, passivation film fall off and color change. The general total amount should be controlled within the range of 25-30ml/L.

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Description

Common failures and processing method

Problem Description

Probable cause

Solutions

Poor brightness

Lack of brightener

Lack of softener

Organic

impurity pollution

Brightener supplement

Softener supplement

Activated

carbon filtration

Poor coverage

No coating in hole and concave

Lack of brightener

Lack of softener

Low potassium chloride

The bath temperature

becomes higher

Aluminum

impurity pollution

Brightener supplement

Softener supplement

Potassium

chloride supplement

Lowering temperature

Treat with zinc powder

The bright range is narrow and the coating is easy to burn

The PH value of the bath increases

Lack of zinc

Lack of boric acid

Lack of softener

Adjust PH value with dilute hydrochloric acid

Zinc

chloride supplement

Boric acid supplement

Softener supplement

The coating has white mist

Effect of

organic impurities

Poor cleaning after plating

Activated

carbon filtration

Change the

cleaning water

The coating blackening after acid dipping

Iron impurity

Copper impurity

Hydrogen peroxide treatment and filtration

Treat with zinc powder

Roller holes appear

in the coating

Lack of softener

Iron impurity

Excessive current

Lower zinc

Over loading of work

Softener supplement

Hydrogen peroxide treatment and filtration

Lower total current

Zinc

chloride supplement

Reduced loading

The coating has high brightness, low brittleness, turbidity point of the bath can reach more than 80℃, and bright coating can be plated at 65℃. Its comprehensive performance can be completely comparable with similar foreign products, characteristics are as follows:

1. The bath does not contain ammonium, the wastewater is not polluted and easy to treat.

2. The coating is bright, suitable for low chromium passivation.

3. Adaptable to all kinds of basic materials, such as carbon steel, penetrant steel, cast iron, zinc pressure casting parts can be plated with bright zinc layer.

4. Coating brittleness is small, suitable for thicker zinc plating layer.

5. Additive consumption is low, plating solution maintenance is easy, conducive to reducing production costs.

6. The bath foam is low, both barrel and rack plating can be used.

7. Bath temperature range is wide.

Bath formula and technological parameters

	concentration range	Standard concentration
KCl	200-230 g/L	220g/L
ZnCl	60-100 g/L	60g/L (barrel)
Boric Acid	30-40 g/L	35 g/L
HL-93 Softening Agent	20-30 g/L	25 g/L
HL-93 Brightening Agent	0.6 ml/L- 1.0 ml/L	0.8ml/L
Temperature (℃)	10-55℃	40℃
PH value	4.8-5.6	5.2
DK (A/dm2)	0.1-5	3

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