Trivalent Chromium Black Passivation Additives HN-67

Trivalent Chromium Black Passivation Additives HN-67

I.M.T.'s trivalent chromium black passivation agent provides outstanding corrosion resistance to the zinc plated substrates without any hexavalent chromium, which can meet the environment protection standard. I.M.T. trivalent black chromium passivation process pass the test of 72-hour neutral salt spraying(NSS test).

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Details

Trivalent Chromium Black Passivation Additives 

Model No.: HN-67


Introduction of Trivalent Chromium Black Passivation Additives 

I.M.T.'s trivalent chromium black passivation agent provides outstanding corrosion resistance to the zinc plated substrates without any hexavalent chromium, which can meet the environment protection standard. I.M.T. trivalent black chromium passivation process pass the test of 72-hour neutral salt spraying(NSS test).


Advantages of Trivalent Chromium Black Passivation Additives 

1. Completely no Cr6+, can meet the products requirement for exporting to Europe, America, Japan etc.

2. Good corrosion- resistance ability and heat-resistance ability, with a long life cycle.

3. The operating range of passivation solution is wide and easy to adjust.

4. Suitable for acid zinc barrel plating and cyanide-free alkali zinc rack plating production line.


Components

Black zinc solution HN-67A 

Black zinc solution HN-67B


Bath Composition and Working Conditions

Bath composition and working conditions

 

Range

Optimum

Black zinc solution HN-67A    

40-80 ml/L                

60ml/L

Black zinc solution HN-67B

30-60ml/L

50ml/L

pH value

2.2-2.5

2.4

Temperature

15-30℃ 

25℃ 

Time

30-80 seconds

50 seconds

Agitation

Air agitation or mechanical agitation

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