Zinc and zinc alloy plating black passivation solution and preparation method thereof
A technology of zinc alloy and passivation solution, which is applied in the coating process of metal materials, etc., can solve the problems of uneven passivation layer, easy peeling off, uneven black film, etc., achieve high market competitiveness, development potential, and easy operation Easy to learn, good corrosion resistance
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Example Embodiment
[0046] Example 1 (1L as an example)
[0047] Chromium Nitrate 10g
[0048] Cobalt sulfate 2g
[0049] Silica sol 1g
[0050] Polyamide 1g
[0051] Anhydrous sodium sulfite 2g
[0052] Malonic acid 7g
[0053] Oxalic acid 7g
[0054] Sodium acetate 7g
[0055] Ferrous sulfate 3g
[0056] Manganese sulfate 3g
[0057] Nitric acid 5g
[0058] The rest is water
[0059] Preparation method:
[0060] 1) Weigh 10g of trivalent chromium salt into the container, add 50ml of deionized water, stir evenly,
[0061] 2) Heat to 75-80°C, add 7g malonic acid and 7g oxalic acid, stir until completely dissolved;
[0062] 3) Add 2g of cobalt sulfate, 1g of silica sol and 1g of polyamide, stir to completely dissolve and mix well;
[0063] 4) Reduce to room temperature, add 2g of anhydrous sodium sulfite and 7g of sodium acetate, dissolve and stir evenly to obtain component A for use;
[0064] 5) Take another container, add 50ml of deionized water, 3g ferrous sulfate, 3g manganese sulfate and 5g nitric acid successively...
Example Embodiment
[0067] Example 2
[0068] Basic chromium sulfate 12g
[0069] Cobalt sulfate 2g
[0070] Silane coupling agent A-171 1g
[0071] Potassium dihydrogen phosphate 2g
[0072] Sodium hypophosphite 3g
[0073] Succinic acid 7g
[0074] Glycine 10g
[0075] Acetic acid 3g
[0076] Nickel sulfate 5g
[0077] Silver nitrate 2g
[0078] Ammonium molybdate 7g
[0079] Sulfuric acid 5g
[0080] The rest is water
[0081] The preparation method and usage method are the same as in Example 1.
Example Embodiment
[0082] Example 3
[0083] Chromium Nitrate 15g
[0084] Cobalt sulfate 2g
[0085] Ethylenediamine tetramethylene phosphonic acid 2g
[0086] Polyvinyl chloride 1g
[0087] Thiourea 4g
[0088] Glycolic acid 13g
[0089] Malic acid 4g
[0090] Oxalic acid 3g
[0091] Boric acid 5g
[0092] Manganese sulfate 2g
[0093] Silver nitrate 5g
[0094] Sodium nitrate 10g
[0095] Nitric acid 5g
[0096] The rest is water
[0097] The preparation and use methods are the same as in Example 1.
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