Environment friendly room temperature non-slag colorful chemical conversion solution and process
A chemical conversion, environmentally friendly technology, applied in the field of color film, to achieve the effect of good corrosion resistance, fine crystallization and stable bath liquid
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example 1
[0047] Take 40×40×1mm cold-rolled steel sheet for use.
[0048] (6) Chemical transformation
[0049] Put the activated test piece into the chemical conversion solution, control the temperature at 20°C, and adjust the pH to 2.8 with sodium hydroxide for 15 minutes. The chemical conversion formula is as follows: zinc phosphate 10.8g / L, phosphoric acid (concentration not less than 85%) 9.5ml / L, acid manganese phosphate 1.7g / L, sodium phosphate 3.9g / L, adipic acid 6.5g / L, Zinc nitrate 3.1g / L.
[0050] (7) dry
[0051] Take the test piece treated with the chemical conversion solution out of the bath, rinse it with tap water, and dry it with a hair dryer.
[0052] The surface of the obtained test piece is covered with a uniform crystal fine color chemical conversion film, and the corrosion resistance time of the copper sulfate drop test is 110s.
example 2
[0053] Example 2: Except that the proportioning composition of (6) chemical conversion treatment is different, all treatment steps (1), (2), (3), (4), (5), (6), (7) and Example 1 is the same.
[0054] Chemical conversion: Put the activated test piece into the chemical conversion liquid, control the temperature at 10°C, adjust the pH to 2.7 with sodium hydroxide and treat for 30 minutes; chemical conversion liquid formula: zinc phosphate 10.3g / L, phosphoric acid 15.0ml / L, acid manganese phosphate 2.8g / L, sodium phosphate 6.0g / L, oxalic acid 8.4g / L, sodium nitrate 4.6g / L.
[0055] The obtained chemical conversion film is a crystalline fine color film layer, and the resistance to the copper sulfate drop test is up to 90s.
example 3
[0057]Except that the proportioning composition of (6) chemical conversion treatment is different, all treatment steps (1), (2), (3), (4), (5), (6), (7) are identical with example 1 .
[0058] Chemical conversion: put the activated test piece into the chemical conversion solution, control the temperature at 30°C, adjust the pH to 2.5 with sodium hydroxide, and treat for 10 minutes; chemical conversion liquid formula: zinc phosphate 3.8g / L, phosphoric acid 4.0 ml / L, acid manganese phosphate 0.6g / L, sodium phosphate 1.8g / L, acetic acid 4.1g / L, copper nitrate 1.6g / L.
[0059] The obtained chemical conversion film is a crystalline and fine colored film layer, which is resistant to the copper sulfate drop test for 100s.
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