- Oct 16, 2018 -
Trivalent chrome blue white passivation agent is suitable for all kinds of zinc-plated or alkaline zinc electroplating production lines for hanging or barrel plating, and is used at normal temperature.
Process characteristics: completely free of hexavalent chromium, meeting the requirements of products exported to Europe, the United States, Japan and other places. The blue passivation film has excellent corrosion resistance and can pass the 96-hour neutral salt spray test. It is suitable for all kinds of zinc-plated or alkali zinc electroplating production lines for hanging or barrel plating, and is used at normal temperature. The passivation solution can be used for a long time, but it is supplemented by consumption and does not need to be replaced frequently.
Operating conditions: trivalent chromium blue white passivation agent 100-160 ml, temperature 25-35 ml, passivation time 15-40 seconds, pH 1.6-2.2, mechanical agitation or air agitation.
Solution maintenance: When the passivation solution is first configured, NaOH should be used to adjust the pH to about 2.0.
In the production process, if the pH is too high, the passivation film will be yellowish. It can be adjusted by adding blue zinc water or nitric acid.
If a blue color is required, a shorter passivation time or a lower pH value may be used; if better corrosion resistance is required, a higher concentration or a longer passivation time should be used.
Equipment requirements: lined with stainless steel or plastic tank with acid and fluorine resistant lining.
Circulating filtration: The filter pump can filter the plating solution at least twice in one hour.