Zinc Electroplating Alkaline Zincate Cleaning Agent

HL-936 Alkaline zincate zinc cleaning agent

HL-936 Alkaline zincate zinc cleaning agent

Packing: 25kg/drum or 200kg/drum or 1000kg/drum

 

HL-936 alkaline zincate zinc additive is a new cyanide-free zinc brightener, containing two kinds of brightener, with leveling, bright, high temperature resistance of multiple functions. Using the brightener can simplify the application process, good process stability, simple composition of plating solution, low production cost, less corrosion to equipment, easy treatment of waste water. HL-936 brightener using process has the advantages of wide current density range, high brightness of coating, fast luminous speed, good dispersion ability and deep plating ability, allowing plating thicker coating, coating no foaming, no peeling, and suitable for hanging plating, rolling plating, low chromium, trivalent chromium passivation, is a more ideal zincate zinc brightener.

 

 

Zinc Oxide	10--14g/L
Sodium Hydroxide	100--140 g/L
HL-936A Softening agent	10ml/L
HL-936B Brightening agent	6ml/L
HL-936 Cleaning agent	8—10ml/L
Temperature	5—45℃
Current density	1—8A/dm2
Cathode efficiency	70—75%
Area ratio of anode and cathode	1:2
Zinc Oxide : Sodium Hydroxide	1:8-12
Filtration	1-2 times/hour
Stir	Regular

 

1. The newly distributed tank liquid shall be treated with HL-936 purifying agent. The tank should be analyzed regularly, fed regularly and treated regularly. Maintain proper concentrations of zinc and caustic soda in the bath, as they determine the conductivity of the solution.

(1) Less metal zinc is easy to cause charring in the high current area and reduce the overall current efficiency; When zinc content is too high, the performance of low current region will be reduced.

(2) When the content of sodium hydroxide is high, the leveling performance of the coating is slightly decreased, and the environmental odor is larger; When the content of sodium hydroxide is low, the coating ability of low current density area is reduced.

2. The bath is treated with 0.5-1.5g/L zinc powder every one to two months, filtered after 2 hours (note: zinc powder should not stay in the bath for too long), and electrolyzed for 4-8 hours with 0.1-0.2 A /dm2 current density.

 

 

Temperature 30℃	Temperature 40℃
HL-936A Softening agent 100-120ml/KA.h	HL-936A Softening agent 240-260ml/KA.h
HL-936B Brightening agent 60-90ml/KA.h	HL-936B Brightening agent 200-220ml/KA.h
HL-936 Cleaning agent	HL-936 Cleaning agent 30-50ml/KA.h

 

Preparation of plating solution for zinc oxide purity requirements of more than 98% industrial grade, sodium hydroxide to use more than 95% purity of solid alkali.

1. Pour the calculated amount of sodium hydroxide into the tank.

2. Into the total volume of 1/5 of the water (with hot water in winter) quickly stir dissolved, become transparent.

3. Weigh the calculated amount of zinc oxide, water into a paste,

4. Gradually add to the hot lye with constant stirring until it is completely dissolved.

5. The plating solution in stirring slowly add water to the total volume of 2/3. (residual volume plus additive)

6. When the plating solution is cooled to 40 degrees below, add 2-3 grams/l zinc powder and stir fully for 15-20 minutes.

7. No zinc powder can be 0.2g/l of sodium sulfide instead, dissolve first, and dilute several times behind add edge stirring evenly added to the plating solution, standing for 4-8 hours after filtration.

8. Add additives according to the requirements of the process specification, electrolytic 4-8 hours under the condition of 0.1-0.2A /dm2 current density, trial production, and put into normal production after qualified products.

 

 

Fault phenomenon	Possible causes	Correction method
Poor dispersion	Insufficient additives High zinc and low alkali, imbalance High temperature and low current density	Supplement main additive Analysis adjustment to reduce zinc anode Increase current density
Coating luster uneven Yin and Yang surface	Insufficient brightener or poor dissolution High zinc content Low current density High organic impurity	Add brightener and stir well Analysis adjustment to reduce zinc anode Increase current density Activated carbon treatment
The coating is dull and dull	Metallic impurity Less brightener Excess temperature	Sodium sulfide or zinc powder treatment Supplementary brightener reduction of temperature
The coating is silvery white after passivation to earth yellow	High lead content	Sodium sulfide or zinc powder treatment
The coating is brittle and has pitted vesicles	Pretreatment oil is not cleaned Excess brightener High organic impurity Low temperature and high current density	Check pretreatment and improvement Activated carbon treatment Activated carbon treatment Reduce current density
Slow deposition rate	Low zinc content EDTA excess Low current density The temperature is too low	Increase zinc anode A period of time not to supplement Increase current density Raise the temperature to 20℃
Anode passivation, zinc ion decline	1.The anode area is small and the current density is high 2.Low sodium hydroxide	Increase zinc anode Analyze and supplement sodium hydroxide
The coating is rough and the edges and corners are easy to burn	Over current density Deficiency of main additive High zinc and low alkali, imbalance	Reduce current density Supplement additive Analysis and adjustment

 

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