HLD-243 black zinc passivation

Black zinc passivator

1. It is completely free of hexavalent chromium and is a trivalent chromium black coating agent for galvanizing.

2. Corrosion resistance (salt spray test) is the same as hexavalent chromium phosphate black film

3. The appearance of the film is a black film with almost no multi-interference color

4. Drainage treatment is simple, only general neutralization treatment is required

5. This black passivation agent is suitable for both acid passivation and alkaline passivation. When the thickness of zinc layer is 5-8 microns, the salt spray test time can reach 96 hours.

Other parameters
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Rolling Hang up

LD-243-A1 60~140ml LHLD-243-A1 60~100mL/L

HLD-243B 20~40ml LHLD-243B 25~75mL/L

PH 2.0~ 2.5 PH 2.3~ 2.5

Processing temperature 20~30℃ Processing temperature 20~30℃

Processing time 20~50秒 Processing time 70~100秒

Nitric acid light 3~10mL Nitric acid light 3~10mL/

Blocking agent Blocking agent

HLD-242C 50~80mL/L HLD-242C 50~80mL/L

PH 4.0-4.5 PH 4.0-4.5

Processing temperature 50-60℃ Processing temperature 50-60℃

Black zinc passivation

HLD-243 black zinc passivation