Water Soluble Potassium Chloride Zinc Electroplating

USE: 1. Metal surface treatment zinc electro-plating 2. zinc-plating standard parts, such as screw, nuts, and bolts 3. Metal accessories and metal fittings need to be electro-plated 4. Electric plating parts color has silver white, blue white, and color

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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

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-91 Softener	20-30 g/L	25 g/L
HL-91 Brightener	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