September 26, 2022, 11:51:35 PM
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Topic: The process of galvanizing and passivation of steel. Welding seams, electroplati  (Read 462 times)

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Offline Don

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I am from Kazakhstan
Sorry for my English.

Automation Engineer, My Hydroponics

Two tons of St3 grade steel (similar to A284Gr.D, A57036, A573Gr.58, A611Gr.C, GradeC, K01804, K02001....), metal profile from 15x15 to 40x40 mm, length 6000 mm. I bought 50 kg of citric acid, monohydrate, 5 kg of zinc dust, built a bath 6.5x0.5x0.5 m.

Step by step:
- mechanical cleaning and degreasing with gasoline;
- washing with laundry soap, pH 11-12;
- rinsing under pressure with water (water is cleaned with a carbon filter);
- galvanizing in a bath (without galvanizing), filling with water / lemon / zinc - ratio 90 / 10 / 1.
Temperature 20C, time of day.
If I raise it to 60-70C, can I shorten the time?
Further -
- passivation with citric acid according to this technology
Temperature 20C.
- get a thin protective layer of 0.0..01 microns of chromium.
According to the link there 20 minutes, pH 2-3;
- drying.

 Do you think it is possible to apply an additional protective layer by passivation?
How effective will it be?
- after all, in theory, the first layer of galvanizing during passivation should decrease ...

Further -
I want to process welding seams in a galvanic way.
I will make soldering acid (zinc + phosphoric acid), a 12V power supply for electroplating.
Electrode with swab (soaked in soldering acid) for galvanizing the weld.
- this will be enough?

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