Zinc Plating Brightener

Galvanizing brightener is a brightener suitable for high, medium, and low cyanide galvanizing processes.

 

Author: Marisa

Galvanizing brightener is mainly used to improve the brightness of the galvanized layer, increase the corrosion resistance of the galvanized layer, improve surface hardness, make the galvanized layer bright and beautiful, and increase the added value of the product.

 

Erotic characteristics

1. Excellent brightness performance and wide range of current density.

2. Single additive, easy to use and manage

3. Good temperature resistance.

 

Three usage methods

Oil and rust removal → Water washing → Polishing or activation → Water washing → Electroplating → Sealing

Operating conditions for galvanizing brightener process:

zinc oxide:10-20 g/L

sodium hydroxide:70-100 g/L

Sodium cyanide:10-50 g/L

Cyanide zinc plating brightener:4-6 milliliters per liter

Temperature:20-40℃

DK:0.5-6A/dm

Production maintenance:
Cyanide zinc plating brightener:100-150 ml/KAH

matters needing attention
Heavy metal impurities in alkaline zinc plating solution have a significant impact on the quality of electroplating. In order to reduce the impact of heavy metal impurities, it is recommended to add sodium sulfide if necessary to precipitate heavy metals from the solution. Our company's supporting product, alkaline purifier, can also be used.

Common brightener formula composition

Primary Brighteners and Classification

1) Sulfonimides: Saccharin, Diphenylsulfonimide

2) Sulfonamides: Toluenesulfonamides

3) Benzenesulfonic acid: Sodium benzenesulfonate

4) Naphthalenesulfonic acids: naphthalene trisulfonic acid, naphthalene disulfonic acid

5) Sulfonates: Sodium benzenesulfonate, sodium p-toluenesulfonate

6) Heterocyclic sulfonic acids: Thiophene-2 sulfonic acid

 

2 secondary brighteners:

1) Aldehydes: formaldehyde, hydrated chloral, ortho sulfonobenzaldehyde

2) Ketones: coumarins

3) Acetynes:

A. 1.4- Butynediol and its derivatives, (Propoxylated Butynediol BMP, Dipropyloxylated Butynediol BDP, Butynediol Ethoxy Compound BEO)

B、 Propargyl alcohol and its derivatives (propargyl alcohol PAP; compounds of propargyl alcohol and epoxyethane PME (can be used as brighteners and leveling agents, N, N-dimethylaminopropargylamine, N, N-diethylaminopropargylamine (DEP), diethylaminopentynediol); DEP is a powerful brightener and leveling agent, serving as a component of the main brightener; PABS: Diethylpropargyl carbamate, in aqueous solution with a mass fraction of 60%; MPA: Dimethylpropargylamine, a light yellow transparent liquid, is a powerful brightener and leveling agent.

4) Cyanides: ethylene cyanide alcohol

5) Heterocycles:

Pyridine derivatives PPS, PPSOH, quinoline methyl iodide

A: Pyridine derivatives are powerful brighteners, but the coating is brittle and prone to blackening. PPS and PPSOH: divided into solid and liquid (40%);

The difference between PPS and PPSOH comes from the content of free pyridine. In the presence of pyridine, the coating will turn black and brittle; BN Brightening Agent

 

3 auxiliary brighteners

3-1 wetting agent:

1) Sodium dodecyl sulfate

2) Sodium Isooctyl Sulfate

3) LB low foaming wetting agent (sulfonation product with double bond structure in low-carbon connection), the coating does not produce flower or mist

4) The sulfonated product of polyethylene glycol (commonly used in 200, 400, 600) OP-10 has a certain brightening effect

5) Sodium Fatty Alcohol Polyoxyethylene Ether Sulfate (AES)

3-2 Additives that can increase coverage capacity

1) Sodium allyl sulfonate (ALS)

2) Sodium vinyl sulfonate (VS) is similar to ALS and has not been produced domestically

3) Sodium styrene sulfonate is similar to ALS and has not been produced domestically

4) Sodium Propyne Sulfonate (PS) has the functions of both a type of brightener and an auxiliary brightener, with both brightening and leveling effects

5) Carboxyethyl thiourea betaine (ATP) is obtained by reacting thiourea with sulfonic acid lactone, and is a deep plating agent and impurity masking agent.

6) Deep plating agent: a deep plating agent from Shanghai Yongsheng Additive Factory; LCDA potential migration agent; Anmet's Low Level Valley Stimulating Agent for LCD Nickel Plating